Photography Calculators
Free photography tools for every need. All calculations happen in your browser. No signup, no tracking.
Aperture f-Stop Calculator: T-Stop and f-Number Tool
Calculate f-number from lens focal length and entrance pupil diameter. Convert between f-stops and T-stops to find actual light transmission. Free.
Aspect Ratio Crop Calculator: Exact Pixel Dimensions
Enter your image dimensions and a target aspect ratio to get exact crop dimensions in pixels. Presets for Instagram, YouTube, and print. Free.
Astrophotography Exposure Calculator: 500/NPF Rule
Apply the 500 rule and the more accurate NPF rule to find the max shutter speed without star trails for your focal length and camera. Free.
Background Blur Estimator: How Creamy Is Your Bokeh?
Enter aperture, focal length, subject and background distance to estimate background blur with a creamy-to-subtle rating. Free, instant.
Blue Hour Calculator: Morning and Evening Times
Find morning and evening blue hour windows for any date and latitude. Uses a simplified solar calculation: pick a preset city or enter custom coordinates.
Circle of Confusion Calculator: DoF Sharpness Guide
Calculate the circle of confusion (CoC) for any camera sensor size, viewing distance, and print size. Essential for accurate depth of field calculations.
Depth of Field Calculator: DoF and Bokeh Guide
Calculate depth of field, hyperfocal distance, near/far focus limits, and background blur (bokeh) for any camera, lens, and aperture combination.
Depth of Field Table Generator: Printable DoF Chart
Generate printable depth of field tables for any camera and lens: hyperfocal distance, near and far limits, formatted for print. Free.
Equivalent Exposure Calculator: Every EV Combination
Lock in an exposure value and see every equivalent aperture, shutter speed, and ISO combination. Instant EV math in your browser. Free.
Exposure Calculator: Equivalent Camera Exposures
Calculate equivalent camera exposures by adjusting aperture, shutter speed, and ISO. Find the correct EV (Exposure Value) for any lighting condition.
Film Developing Timer: Darkroom Timer with Reminders
Darkroom timer for black and white film developing with agitation interval beeps and presets for HP5+, Tri-X, and FP4+. Free.
Flash Guide Number Calculator: Find Correct Aperture
Enter your flash guide number, ISO, and distance to find the correct aperture for perfect flash exposure, or solve for distance instead. Free.
Focal Length Calculator: Magnification and Distance
Calculate focal length from subject size and distance, find image magnification and sensor coverage. Free tool for photographers.
Focal Length Converter: Full-Frame Equivalent
Convert focal lengths between sensor sizes. Get the full-frame equivalent, crop factor, and field of view for any lens. Free, instant results.
Focus Stacking Calculator: Steps and Step Size
Calculate how many focus steps and what step size you need for razor-sharp macro and product photos, front to back. Free, instant.
Golden Hour Calculator: Sunrise and Sunset Times
Calculate golden hour, blue hour, sunrise, and sunset times for any location and date. Find the perfect time for outdoor photography.
Hyperfocal Distance Calculator: Maximum Sharp Focus
Calculate hyperfocal distance for any lens and aperture. Focus at the hyperfocal distance for maximum depth of field to infinity. Free.
ISO Noise Calculator: Image Noise Level by ISO
Estimate image noise (SNR) for different ISO settings. Find the cleanest ISO for your camera and learn the ISO versus noise tradeoffs. Free.
Long Exposure Timer: Bulb Mode Timer with Audio Beep
Free count-up and count-down timer for long exposure and bulb mode photography, with an audio beep when time is up. Works offline.
Macro Magnification Calculator: Macro Photo Ratios
Calculate magnification ratio for macro photography. Find subject size, working distance, and extension tube settings for any lens and camera.
ND Filter Calculator: Neutral Density Exposure Times
Calculate the correct exposure time when using ND filters. Find the required shutter speed for any ND filter strength from ND2 to ND100000.
Panorama Shot Planner: Frame Count and Overlap
Plan a panorama before you shoot: get the exact frame count with proper overlap for your focal length and sensor, plus multi-row coverage. Free.
Photo Storage Calculator: Memory Card Capacity
Estimate RAW and JPEG file sizes from your camera's megapixels, see how many shots fit on a memory card, and plan your shoot. Free.
Print Size Calculator: Max Print Size at 300 DPI
Enter your camera's megapixels to see the largest high-quality print size at 300, 240, and 150 DPI, plus real DPI of frame sizes. Free.
Shutter Speed Chart: Settings for Motion and Blur
Complete shutter speed chart with recommended settings for different subjects. Calculate the minimum shutter speed to freeze motion or create motion blur.
Time-Lapse Interval Calculator: Frames and Storage
Plan a time-lapse: enter shooting duration and target clip length to get the exact interval, total frames, and storage needed. Free.