Mortgages, BMI, SEO, chemistry, physics, DIY, math, developer utilities, every calculation happens in your browser. Fast, private, and free.
From money math to music theory, find the right tool in seconds.
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Every calculator on Toolybird, filterable by category.
Calculate molar mass from chemical formula
ChemistryFind mole ratios from balanced equations
ChemistrypH from strong acid concentration
ChemistrypH from Ka and concentration
ChemistrypH from strong base concentration
ChemistrypH from Kb and concentration
ChemistrySolve PV=nRT for any variable
ChemistryP1V1/T1 = P2V2/T2 solver
ChemistryP1V1 = P2V2 at constant temperature
ChemistryV1/T1 = V2/T2 at constant pressure
ChemistryFind the limiting reactant in a reaction
ChemistryCalculate reaction percent yield
ChemistryCalculate moles per liter of solution
ChemistryCalculate moles per kg of solvent
ChemistryM1V1=M2V2 dilution problems
ChemistrypH of buffer solutions
ChemistrypH = pKa + log([A⁻]/[HA])
ChemistrySolubility product constant
ChemistryFind oxidation states in compounds
ChemistryBalance chemical equations automatically
ChemistryEmpirical formula from % composition
ChemistryMolecular formula from empirical + mass
Chemistry% mass of each element in a compound
ChemistryΔHrxn from formation enthalpies
ChemistryΔG = ΔH - TΔS
ChemistryRate constants and activation energy
ChemistryVolume and moles of gases
ChemistryBoiling and freezing point shifts
ChemistryFaraday's law mass and charge
ChemistryConfigurations for all elements
ChemistryKc, Kp and reaction direction
ChemistryLewis structure charges
ChemistryPressure and temperature of gases
ChemistryEnthalpy from reaction steps
ChemistryCell potential at any concentration
ChemistryDalton's law for mixtures
Chemistry[H+] and [OH-] interconversion
ChemistryMaximum product from reactants
ChemistryMolarity and equivalence points
ChemistryClausius-Clapeyron equation
ChemistrySolve for v, a, t, d with 3 known values
PhysicsRange, height, and time of flight
PhysicsTime and velocity of falling objects
PhysicsForce for circular motion
Physicsτ = F × r × sin(θ)
PhysicsI for rod, disk, sphere and more shapes
PhysicsI = ½MR² for a solid disk
PhysicsI = (1/12)ML² for a thin rod
PhysicsKE = ½Iω² for rotating bodies
PhysicsL = Iω for rotational systems
PhysicsW = F·d·cos(θ)
PhysicsKE = ½mv²
PhysicsPE = mgh
PhysicsF = -kx (Hooke's Law)
Physicsv = f × λ
PhysicsdB = 10·log(I/I₀)
PhysicsSolve V=IR for any variable
PhysicsTotal resistance in series circuits
PhysicsTotal resistance in parallel circuits
PhysicsC = εA/d for parallel plate capacitors
PhysicsF = qvB for charged particles
PhysicsElectrostatic force between charges
PhysicsSolve density=mass/volume with table
PhysicsFrequency shift for moving sources
PhysicsEscape speed for any celestial body
PhysicsConvert frequency, wavelength, energy
PhysicsNewton gravity with body presets
PhysicsRadioactive decay with isotope presets
PhysicsSolve p=mv for any variable
PhysicsSolve F=ma for any variable
PhysicsKE=hf minus work function
PhysicsP=W/t, P=Fv, and P=VI in one place
PhysicsP=F/A with 6 unit conversions
PhysicsPeriod T=2pi sqrt(L/g)
PhysicsRefraction with TIR detection
PhysicsQ=mcT with substance presets
PhysicsBoards needed for any deck size
DIY & HomePosts and panels for fencing
DIY & HomeCubic feet/yards of concrete needed
DIY & HomeConcrete for cylindrical footings
DIY & HomeGallons of paint for any room
DIY & HomeFloor tiles needed with waste factor
DIY & HomeShingle bundles for your roof area
DIY & HomeSiding panels for exterior walls
DIY & HomeDrywall sheets needed for any area
DIY & HomeBoxes of flooring with waste %
DIY & HomeStuds needed for any wall length
DIY & HomeOptimal joist spacing for your span
DIY & HomeRequired beam size for span and load
DIY & HomeCubic feet of soil for raised beds
DIY & HomeCubic yards of mulch needed
DIY & HomePavers needed for any patio area
DIY & HomeBricks needed for walls
DIY & HomeGrout bags needed for tile jobs
DIY & HomeGallons of stain for wood surfaces
DIY & HomeX% of Y, percentage change, difference
MathAdd, subtract, multiply & divide fractions
MathPrime factors, divisors, factor tree
MathLeast common multiple & greatest divisor
MathSolve ax² + bx + c = 0 with steps
MathBinary, octal, decimal, hex conversion
MathMean, median, mode, standard deviation
MathSimplify ratios and solve proportions
MathConvert and operate in scientific notation
MathFind any side of a right triangle
MathArea and perimeter for any shape
MathPowers, roots, and logarithms
MathBinary arithmetic and bitwise operations
MathDifferentiate functions with steps shown
MathLong division with every step shown
MathPythagorean theorem solver for right triangles
MathAdd, multiply, determinant and inverse
MathFraction arithmetic with steps and simplification
MathnPr and nCr with formulas and steps
MathFair random integers in any range
MathDecimal places and significant figures
MathCoordinate geometry from two points
MathSolve 2x2 linear systems with steps
MathSolve any triangle: SSS, SAS, ASA, AAS
MathLogic gates and boolean expressions
MathVolumes for 8 common 3D shapes
MathNear/far limits of sharp focus
PhotographyMaximum sharpness from near to infinity
PhotographyShutter speed from ISO and aperture
PhotographyFocal length from subject size & distance
PhotographyEstimated noise level from ISO
Photographyf-number from pupil diameter
PhotographyMagnification ratio for macro photography
PhotographyCoC for depth of field calculations
PhotographyLong exposure time with ND filters
PhotographySunrise and golden hour times by location
PhotographyFull/half/third-stop shutter speed scale
PhotographyConvert between formats and sensor sizes
PhotographyExact crop dimensions in pixels for any aspect ratio
PhotographyMax shutter speed without star trails via 500 and NPF rules
PhotographyEstimate bokeh creaminess from aperture, lens, and distances
PhotographyMorning and evening blue hour windows for any date
PhotographyPrintable DoF tables for any camera and lens combo
PhotographyEvery equivalent aperture, shutter, and ISO combination
PhotographyDarkroom timer with agitation beeps and B&W film presets
PhotographyFind the correct aperture, distance, or guide number for flash exposure with ISO adjustment.
PhotographyCalculate focus steps and step size for sharp macro and product stacks front to back.
PhotographyCount-up and count-down bulb mode timer with progress bar and audio alert.
PhotographyGet exact frame counts, rows, and overlap for seamless stitched panoramas.
PhotographyEstimate RAW and JPEG file sizes, shots per card, and cards needed per shoot.
PhotographySee max print sizes at 300, 240, and 150 DPI plus real DPI for common frames.
PhotographyGet the exact shooting interval, frame count, and storage for your time-lapse.
PhotographyIdentify chord from its notes
MusicNotes for any scale and root
MusicSong length from BPM and beat count
MusicName the interval between two notes
MusicPractice with a gradual tempo increase
MusicConvert Hz to musical note
MusicConvert musical note to Hz
MusicFrequencies for different temperaments
MusicEnter chords and a capo position to see the shapes you play or find the capo fret that fits your voice.
MusicPick a key and mood to generate chord progressions with roman numerals and notes.
MusicPaste chord charts and transpose up or down by semitones, qualities preserved.
MusicBPM to milliseconds for quarter, eighth, dotted, triplet and sixteenth subdivisions.
MusicAll seven diatonic chords in any key with roman numerals, notes and functions.
Music16-step browser drum machine with synthesized kick, snare, clap and hats.
MusicInteractive guitar fretboard quiz with score and streak tracking.
MusicClickable circle of all 12 major and minor keys with signatures, chords, and playable audio.
MusicIdentify musical intervals by ear in a scored quiz with three difficulty levels.
MusicConvert chord progressions to Nashville numbers and transpose them to any key.
MusicBuild a gig setlist with song times, breaks, and buffers, and get the full schedule.
MusicEnter the chords of a song to find its most likely key, ranked by confidence.
MusicTap along to any beat to measure BPM with a rolling average and stability readout.
MusicDetect your lowest and highest sung notes with your mic and find your voice type.
MusicValidate and pretty-print JSON
DeveloperEncode or decode Base64 strings
DeveloperTest regex patterns with explanations
DeveloperConvert hex colors to RGB and back
DeveloperFormat and indent SQL queries
DeveloperEncode or decode URL strings
DeveloperMinify CSS to reduce file size
DeveloperEncode/decode HTML special characters
DeveloperRemove duplicate lines from any text list
Text Processingsnake_case, camelCase, kebab-case…
Text ProcessingWord/character count + reading time
Text ProcessingCompare two texts and highlight differences
Text ProcessingRemove extra spaces and clean up text
Text ProcessingReverse characters, words or lines
Text ProcessingGenerate placeholder text for mockups
Text ProcessingNumber every line with custom formats
Text ProcessingStrip hidden characters from AI text
Text ProcessingEstimate tokens and costs for AI models
Text ProcessingConvert between CSV, TSV, pipe formats
Text ProcessingCatch repeated words like the the
Text ProcessingPull emails and links from any text
Text ProcessingStylish Unicode text for bios and posts
Text ProcessingBulk replace with regex support
Text ProcessingText to Morse with audio playback
Text ProcessingFix wrapped lines from PDF copies
Text ProcessingSort A-Z, numeric, or shuffle lines
Text ProcessingRemove markup, keep clean plain text
Text ProcessingEncode text to binary and back
Text ProcessingHear text read aloud with voices
Text ProcessingSecure passwords + memorable passphrases
Data GeneratorsGenerate single or bulk UUIDs
Data GeneratorsRandom integers, dice rolls, coin flips
Data GeneratorsMD5, SHA-1, SHA-256, SHA-512 from text
Data GeneratorsBeautiful color palettes for web design
Data GeneratorsExact age in years, months, days + birthday
Time & ScheduleCountdown and stopwatch with audio alerts
Time & ScheduleDays, weeks, months between any two dates
Time & ScheduleConvert time between any two time zones
Time & ScheduleConvert timestamps to dates and vice versa
Time & ScheduleLive countdown to your next birthday
Time & ScheduleWorking days excluding weekends/holidays
Time & ScheduleAdd/subtract days, weeks, months, years
Time & ScheduleWhat weekday any date falls on
Time & ScheduleYour life in days, hours, seconds
Time & ScheduleGen Z, Millennial, Gen X, or Boomer?
Time & ScheduleLive countdowns to US holidays
Time & ScheduleHIIT/Tabata timer with audio beeps
Time & ScheduleOverlapping hours across time zones
Time & Schedule12-hour to 24-hour time conversion
Time & ScheduleFree alarm with sounds and snooze
Time & ScheduleAdd/subtract times and durations
Time & ScheduleISO week numbers for any date
Time & ScheduleLive time in major world cities
Time & ScheduleWestern and Chinese zodiac signs
Time & ScheduleImpose 2, 4, 6, 9 or 16 pages per sheet
PDF ToolsImpose pages as a foldable booklet
PDF ToolsMake annotations and forms permanent
PDF ToolsStraighten rotated scanned pages
PDF ToolsStamp Page X of Y numbering on pages
PDF ToolsDiagonal text or image watermark
PDF ToolsCustom header/footer text on every page
PDF ToolsDraw or upload a signature onto pages
PDF ToolsFill AcroForm fields, then save/flatten
PDF ToolsBlack out sensitive regions (visual only)
PDF ToolsView and edit title, author, keywords
PDF ToolsPage count, version, size and details
PDF ToolsPull embedded images, download as ZIP
PDF ToolsSide-by-side visual and text diff
PDF ToolsConvert PDF pages to a web page
PDF ToolsAttempt to fix a corrupted PDF
PDF ToolsExtract text from scanned PDFs
PDF ToolsCustom fonts, colors, sizes, drag-to-position text
Image ToolsAI background removal 100% in-browser
Image ToolsPaste a data URI, preview and download
Image ToolsGaussian blur whole image or region
Image ToolsReplace background with a solid color
Image ToolsCircular crop for avatars
Image ToolsHit an exact file size (e.g. 100KB)
Image ToolsStrip GPS/metadata before sharing
Image ToolsCamera model, aperture, ISO, GPS, more
Image ToolsMulti-size ICO + PNG set with HTML
Image ToolsImages to animated GIF with delay control
Image ToolsColor to black-and-white
Image ToolsConvert iPhone HEIC photos to JPG
Image ToolsSolid borders, frames, polaroid style
Image ToolsBrightness, contrast, saturation sliders
Image ToolsClick any pixel for HEX/RGB/HSL
Image ToolsBefore/after drag slider
Image ToolsReduce JPG/PNG/WebP size with quality slider
Image ToolsJPG, PNG, WebP, GIF, BMP conversion
Image ToolsCrop with aspect-ratio presets
Image ToolsSet print DPI for PNG and JPG
Image ToolsUpscale images 2x or 4x
Image ToolsDominant colors from any photo
Image ToolsResize by pixels or percentage
Image ToolsSplit into grid tiles for carousels
Image ToolsPhotos to text art
Image ToolsEncode images as data URIs
Image ToolsPNG/JPG to Windows icon files
Image ToolsCombine images into one PDF
Image ToolsVectorize raster images
Image ToolsExtract text from images
Image ToolsPhoto negative effect
Image ToolsLossless JPG to PNG conversion
Image ToolsTop/bottom captions on images
Image Tools1200x630 social share cards
Image Tools2x2in and 35x45mm ID photos
Image ToolsCombine photos into grid layouts
Image ToolsInstagram-style filter presets
Image ToolsBlur or pixelate sensitive areas
Image ToolsCustom placeholders with text
Image ToolsConvert with background fill
Image ToolsDecode QR codes from images
Image ToolsStylized quote graphics for social
Image ToolsProcedural abstract art
Image ToolsRotate 90/180/270 and mirror
Image ToolsRound corners, transparent bg
Image ToolsBrowser and phone mockup frames
Image ToolsFix blurry photos
Image ToolsPresets for every platform
Image ToolsRasterize SVG at any size
Image ToolsOpen and convert TIFF files
Image ToolsDarkened photo edges
Image ToolsText and logo watermarks
Image ToolsTo and from WebP
Image Tools1280x720 thumbnail templates
Image ToolsScale any recipe to any number of servings
Baking & CookingIngredient substitutes when you're missing one
Baking & CookingConvert between dry, instant & fresh yeast
Baking & CookingBaker's percentage and dough hydration
Baking & CookingFind pan substitutions by volume
Baking & CookingSalt, water and timing for brines
Baking & CookingFrosting amount for any cake
Baking & CookingServings from any cake size
Baking & CookingBatter amount for any pan
Baking & CookingCoffee and water ratios
Baking & CookingWater temp for fermentation
Baking & CookingSwap egg sizes in recipes
Baking & CookingFondant to cover any cake
Baking & CookingSafe temps with carryover
Baking & CookingIngredient cost per serving
Baking & CookingFeeding ratios that work
Baking & CookingCandy stages from temperature
Baking & CookingTime and temp for turkey
Baking & CookingTips, bill split & percentage compare
FinanceSale prices, stacked discounts & savings
FinanceCompare pack sizes, find the best deal
FinanceConvert salary to hourly wage and back
FinanceBody Mass Index with WHO categories
HealthUS, UK, EU & CM shoe sizes
Unit ConvertersBits, bytes, KB, MB, GB, TB, PB
Unit ConvertersMiles, km, feet, meters, inches & more
Unit ConvertersMPG, L/100km, km/L with trip costs
Unit ConvertersDecode JSON Web Tokens privately
DeveloperPITI, PMI, extra payments & amortization
FinanceGrowth with contributions & Rule of 72
FinanceWhen refinancing pays for itself
FinanceMinimum vs fixed payoff plans
Finance28/36 rule: how much house you can afford
Finance20/4/10 rule car budget
FinanceSnowball vs avalanche comparison
Finance3/6/9-month savings targets
FinanceHourly rate with taxes & utilization
FinanceFull payment schedule & totals
FinanceBMR + activity: cut/maintain/bulk targets
HealthProtein, carbs and fat targets + meal splits
HealthUS Navy tape-measure method estimate
HealthFertile window and ovulation date
HealthDue date, weeks and trimester timeline
Health90-min cycles: best bedtime and wake time
HealthGoogle snippet preview, pixel-accurate
SEO ToolsTagged URLs for Google Analytics
SEO ToolsFlesch, Fog, SMOG and Coleman-Liau scores
SEO ToolsFrequency tables and stuffing check
SEO ToolsNewsArticle and BlogPosting JSON-LD
SEO ToolsDirect link to your review form
SEO ToolsH1-H6 outline with SEO issue flags
SEO ToolsValid HowTo JSON-LD with steps and time
SEO Tools301 and 302 rules without regex
SEO ToolsFind missing and stuffed alt attributes
SEO ToolsSyntax and required-field schema check
SEO ToolsBulk long-tail keyword combinations
SEO ToolsLocal SEO JSON-LD with hours and geo
SEO ToolsComplete SEO head tags in seconds
SEO ToolsActionable 0-100 content score
SEO ToolsSocial share cards for every platform
SEO ToolsEcommerce JSON-LD with reviews and price
SEO ToolsPoint-and-click crawl rules builder
SEO ToolsStandards-compliant sitemap.xml builder
SEO ToolsWealth comparison with break-even year
FinancePrintable invoices, no signup
FinanceCategory targets and vendor tracker
FinanceCar payment, interest & amortization
FinanceNeeds, wants, savings split planner
FinanceProject 529 growth vs college costs
FinanceFront/back-end DTI vs lender rules
FinanceYears to financial independence
FinanceCPI-based purchasing power over time
FinanceTotal cost comparison, 3-6 years
FinanceDiscount points break-even analysis
FinanceAssets minus liabilities tracker
FinanceWhen you hit 20% equity
Finance401(k)/IRA projection with match
FinanceNew pay, hourly rate, real raise
FinanceState rates, add or back out tax
FinanceBenefits at 62, 67, 70 compared
FinanceAvalanche vs snowball payoff plans
FinanceAcronyms + backronyms with scoring
Data GeneratorsCode 39, Code 128, EAN-13 on canvas
Data GeneratorsVisual builder with copyable CSS
Data GeneratorsAnimated spin picker with history
Data GeneratorsTest identities, CSV/JSON export
Data GeneratorsTopic hashtags by reach tier
Data GeneratorsPowerball, Mega Millions, Pick 3/4
Data GeneratorsAnimated fair winner draws
Data GeneratorsNames by gender, origin, bulk mode
Data GeneratorsCurated quotes by topic
Data GeneratorsFair random team splitter
Data GeneratorsLuhn-valid test numbers, dev only
Data GeneratorsAPA 7, MLA 9 and Chicago citations
EducationWeighted and unweighted, 4.0 scale
MathWhat you need on the final exam
MathPlain-English cron plus next run times
DeveloperNested flattening with download
DeveloperRolls needed with pattern repeat
DIY & HomePanel width, rod and drop length
Home & Decorkg, g, lb, oz, stone live conversion
Unit Convertersml, L, cups, gallons and more
Unit Converterssq ft, acres, hectares, sq m
Unit Convertersmph, km/h, m/s, knots conversion
Unit ConvertersCelsius, Fahrenheit, Kelvin live
Unit ConvertersCelsius, Fahrenheit and Gas Mark
Unit ConvertersUS, UK, EU and Japan ring sizes
Unit ConvertersUS, UK, EU sizes for men and women
Unit ConvertersDegrees, radians, gradians, turns & more
Unit Converters16:9, 4:3 and custom ratio sizing
Unit ConvertersVolume to weight for 30+ ingredients
Unit ConvertersMbps, MB/s, Gbps and transfer times
Unit ConvertersJoules, calories, kWh, BTU conversion
Unit ConvertersDecimal degrees and DMS, both ways
Unit ConvertersFeet/inches, cm, meters conversion
Unit Converters1,234 to "one thousand two hundred..."
Unit Convertersmin/km, min/mile and speed, both ways
Unit ConvertersA/B/C series, US Letter, dimensions & dpi
Unit ConvertersWatts, kW, horsepower, dBm conversion
Unit ConvertersPSI, bar, kPa, atm, mmHg conversion
Unit ConvertersNumbers to Roman numerals, both ways
Unit ConvertersSeconds to years, all units converted
Unit Converterspx to rem/em with live table
DeveloperFile size and speed to download time
DeveloperBreak any URL into protocol, host, params
DeveloperCompress HTML safely, see byte savings
DeveloperCheckboxes to octal permissions
Developer(a,b,c) score for any selector
DeveloperCIDR to network, mask, host range
DeveloperSee colors as colorblind users do
DeveloperVerify HMAC-SHA256 signatures
DeveloperUnix time in every time zone
DeveloperPrivate, in-browser strength check
DeveloperFree QR codes, 100% on-device
DeveloperVisual CSS box-shadow with live preview
DeveloperWCAG AA/AAA contrast ratio checker
DeveloperFormat and clean up messy CSS
DeveloperConvert HTML to clean Markdown
DeveloperJSON to interfaces with options
DeveloperLive Markdown to HTML with preview
DeveloperLink previews + meta tag generator
DeveloperPretty-print, minify, validate XML
DeveloperBidirectional YAML/JSON conversion
DeveloperScore blog titles for clicks
SEO ToolsFacebook, X and LinkedIn card previews
SEO ToolsSpam words, length, mobile truncation
SEO ToolsValid FAQPage JSON-LD in seconds
SEO ToolsTest URLs against any robots.txt
SEO ToolsValidate sitemaps before submitting
SEO ToolsClean slugs with live preview
SEO ToolsRight rug size for every room
Home & DecorInside vs outside mount measurements
Home & DecorLumens and bulbs per room
Home & DecorIdeal viewing distance for your TV size
Home & DecorBoxes, tape and wrap for your move
Home & DecorDIY vs movers cost comparison
Home & DecorRight AC size for your room
Home & DecorCADR and room coverage match
Home & DecorYearly cost of any appliance
Home & DecorFan diameter for your room size
Home & DecorPrintable weekly family chore chart
Home & DecorDaily, weekly, monthly task plan
Home & Decor72-hour kit builder and tracker
Home & DecorWill it fit through door and room?
Home & DecorSpacing and the 57-inch hanging rule
Home & DecorPlants matched to light and pets
Home & DecorCare label meanings in plain English
Home & DecorSavings and payback switching to LED
Home & DecorFurniture fit and clearance check
Home & DecorStep-by-step fix for every stain
Home & DecorHousehold use vs the US average
Home & DecorRight pint capacity for your dampness
Home & DecorGutter size and downspout count
DIY & HomeSeed and fertilizer for your lawn
DIY & HomeLinear feet and pieces to buy
DIY & HomeCords, face cords and BTU by wood type
DIY & HomeLumber board feet and cost from dimensions
DIY & Home60/80 lb bags needed for any pour
DIY & HomeEven baluster spacing under 4-inch code gap
DIY & HomeJoint compound and tape for drywall area
DIY & HomeResin volume and hardener split by ratio
DIY & HomeCubic yards and tons of gravel needed
DIY & HomeR-value, batts and blown-in bags by zone
DIY & HomeCan light count and spacing grid
DIY & HomeBlocks, caps, gravel base and drain pipe
DIY & HomeX/12 pitch, degrees and slope multiplier
DIY & HomeAC/heater BTU and tonnage for any room
DIY & HomeSod rolls, pallets and fertilizer for lawns
DIY & HomeRiser, tread, run and code checks
DIY & HomeBoxes, waste and underlayment for LVP
DIY & HomeCorrect AWG by amps, length and voltage drop
DIY & HomeItemized closing costs and cash to close
FinanceEstimate your US take-home pay
FinanceFuel cost for any road trip
FinanceNames with meanings and origins
LifestyleUsernames and gamertags for every platform
LifestyleElf, dwarf, orc and sci-fi names
LifestyleBrandable startup and brand names
LifestyleBlend two names into a ship name
LifestyleDeep, funny and first-date prompts
LifestyleDate ideas by budget and vibe
LifestylePet names with meanings by species
LifestylePunny and romantic wedding hashtags
LifestyleFunny and fierce team names
LifestyleUnique band name ideas by genre and vibe
LifestylePersonalized book recommendations by mood
LifestyleFind your bra size from two measurements
LifestyleRandomly assign household chores fairly
LifestyleSpin the wheel to make tough choices
LifestyleWhat is for dinner? Decided in one click
LifestyleHilarious fantasy football team names
LifestyleThoughtful gift ideas by person and budget
LifestylePick the perfect movie by genre and mood
LifestyleWeek-by-week moving checklist that adapts
LifestyleFun nicknames from any name and vibe
LifestyleCatchy podcast name ideas by topic and tone
LifestyleDaily kindness ideas filtered by setting
LifestyleFair gift exchange matcher with exclusions
LifestyleCheckable packing checklist for any trip
LifestyleCatchy YouTube channel names by niche
LifestylePace, speed and Riegel race-time predictions
HealthKarvonen training zones from your max HR
HealthDaily hydration target by weight and activity
HealthWHR and WHO health-risk category
Health1RM via Epley, Brzycki and Lombardi
HealthDaily protein target by goal and activity
HealthBlood alcohol content estimate by drinks
HealthBP category and what it means
HealthCalories by activity and body weight
HealthType 2 risk score and key factors
HealthFat-free mass index and category
HealthDaily fiber target and food sources
HealthBasal metabolic rate, Mifflin-St Jeor
HealthHealthy weight range for your height
HealthBoer formula lean mass estimate
HealthNext period and cycle predictions
HealthIOM healthy gain range by BMI
HealthWeekly sleep deficit and catch-up plan
HealthCalories burned from daily steps
HealthCardio fitness estimate and rating
HealthWtHR and the 0.5 health threshold
HealthWeeks to goal at a safe deficit
Health180+ curated prompts by genre and tone
Data GeneratorsHours, overtime and gross pay from shifts
FinancePixels per inch, MP and print sizes
DeveloperReading and speaking time for any text
EducationDay-by-day exam study plan with spaced repetition
EducationInteractive flip-card decks from your notes
EducationEstimate ACT/SAT scaled scores from practice raws
EducationSplit names into random teams instantly
EducationEstimate English text level A1 to C2
Education25-min focus timer with tasks and sessions
EducationWPM test with comprehension quiz
EducationEstimate your 1 to 5 AP score from sections
EducationAttendance percent and absences remaining
EducationIs the backpack too heavy for the child?
EducationTrack EA/ED/RD deadlines with countdowns
EducationTrue net cost of colleges side by side
EducationPrintable Cornell notes pages for any subject
EducationWord count, Flesch-Kincaid grade and reading time
EducationMinimum final score needed for your target
EducationTimed arithmetic drills with scoring
EducationFair no-repeat random student picker
EducationWeighted rubric scores to final grade
EducationRandomized seating grids with keep-apart rules
EducationWPM and accuracy typing test
EducationGPA with AP, IB and Honors weighting
EducationCurrent course grade from weighted categories
EducationTrig, logs, powers, factorial, DEG/RAD
MathCompare Roth vs Traditional tax outcomes
FinanceWeekly workout plans by goal and equipment
Lifestyle150+ bucket list ideas, checkable and saved
LifestyleCombine PDFs with page ranges and reorder
PDF ToolsSplit by ranges, every N pages, or ZIP
PDF ToolsRotate all or selected pages 90/180/270°
PDF ToolsRemove pages via thumbnail picker
PDF ToolsDrag-and-drop page thumbnails into order
PDF ToolsPull specific pages into a new PDF
PDF ToolsFlip the entire page order of a PDF
PDF ToolsInsert blank pages at chosen positions
PDF ToolsConvert pages to images, ZIP download
PDF ToolsJPG/PNG photos to PDF, one per page
PDF ToolsExtract all text into a .txt file
PDF ToolsText with headings and lists to .md
PDF ToolsLight optimization, honest size savings
PDF ToolsConvert color PDF to black-and-white
PDF ToolsTrim margins visually or by crop box
PDF ToolsScale pages to A4, Letter, Legal or %
PDF ToolsCalculate molar mass from chemical formula
Find mole ratios from balanced equations
pH from strong acid concentration
pH from Ka and concentration
pH from strong base concentration
pH from Kb and concentration
Solve PV=nRT for any variable
P1V1/T1 = P2V2/T2 solver
No accounts. No paywalls. No data leaving your device.
All calculations happen in your browser, no server round trips, no loading spinners.
Your data never leaves your device. No accounts, no tracking.
Every tool works on phones, tablets, and desktops.
The service worker caches tools so they keep working without internet.
Fresh calculators ship every week across finance, health, SEO, and more.
No freemium limits. No sign-ups. No credit cards, ever.
