π Protein Intake Calculator
Get your daily protein target from your weight, goal, and activity level.
Daily Protein Target
These are estimates for planning and education only, not medical advice. Talk to a qualified professional before changing your training or health routine.
How to Use This Calculator
Enter your body weight, choose whether you are losing fat, maintaining, or building muscle, and set your activity level. The calculator returns a daily gram target, a sensible range around it, per-meal splits, and the equivalent grams per pound.
Enter your current body weight and pick lb or kg. Use your morning weight for the most consistent number.
Choose your goal: lose fat (higher protein protects muscle in a deficit), maintain, or build muscle.
Set your activity level. Athletes in heavy training get an extra 0.2 g/kg on top of the goal target.
Read your daily target and range, then check the 3-meal and 4-meal splits to plan your day.
The Formula
Protein needs scale with body weight and what you are asking your body to do. Building or defending muscle needs more: the International Society of Sports Nutrition and multiple meta-analyses converge on 1.6 to 2.2 grams per kilogram per day for muscle growth, with the top of that range also fitting fat loss, where protein defends lean mass and keeps hunger down. Maintenance needs less, around 1.2 to 1.6 g/kg. Athletes in heavy training add about 0.2 g/kg because each hard session breaks down more muscle that must be rebuilt. The target is the midpoint you aim at; the range is the zone you can drift in without worry.
Worked Example
An active person weighs 180 lb, which is 81.6 kg, and wants to build muscle. Target = 81.6 x 1.8 = 146.9, about 147 g per day. The full range is 81.6 x 1.6 to 81.6 x 2.2, roughly 131 to 180 g per day. Split across 4 meals that is 147 / 4 = 36.7, about 37 g per meal. In per-pound terms, 147 g / 180 lb = 0.82 g per lb, right inside the familiar 0.7 to 1.0 g per lb guideline.
Hitting Your Target in Real Life
The split matters as much as the total. Aim for 25 to 40+ grams of protein per meal across 3 to 5 meals, which for most people means anchoring every meal around a protein source: eggs or Greek yogurt at breakfast, chicken, fish, tofu, or lentils at lunch and dinner, plus a shake or cottage cheese as a snack. Whole food beats supplements for satiety, but whey or plant protein powder is a legitimate convenience tool when whole food is impractical. Track for two weeks, not forever: weigh the main protein sources until you can eyeball portions, then spot-check monthly. And drink water: higher protein intakes go best with solid hydration.
Disclaimer
These are estimates for planning and education only, not medical advice. Talk to a qualified professional before changing your training or health routine.
Frequently Asked Questions
How much protein do I need per day?
For active adults, research supports roughly 1.6 to 2.2 grams per kilogram of body weight daily when the goal is building or keeping muscle, and about 1.2 to 1.6 grams per kilogram for general maintenance. That works out to roughly 0.7 to 1.0 gram per pound of body weight, which is why you often hear the rule of thumb "one gram per pound." This calculator picks a precise target from your weight, goal, and activity level.
Should I eat more protein when losing weight?
Yes. In a calorie deficit, higher protein (around 2.0 grams per kilogram) protects the muscle you already have, keeps you fuller between meals, and burns slightly more calories to digest than carbs or fat. People who eat enough protein during a cut keep noticeably more lean mass than those who do not.
Can I eat all my protein in one meal?
Your body uses protein from every meal, but muscle building works best when protein is spread across 3 to 5 meals, each with at least 25 to 40 grams. The practical takeaway: anchor each meal around a palm-sized or larger protein source rather than backloading everything into dinner. This calculator shows your target split across 3 and 4 meals.
Is too much protein bad for my kidneys?
In healthy people with normal kidney function, high protein intakes within the ranges this calculator suggests have not been shown to damage kidneys. The concern applies mainly to people with existing kidney disease, who should follow their doctor's guidance. If you have any kidney or liver condition, check with your doctor before raising your protein intake.
Do athletes need more protein than active people?
Yes, a bit more. Athletes in heavy training, especially strength and power athletes, benefit from the top of the range, roughly 0.2 extra grams per kilogram compared to moderately active people, because training damages more muscle that needs rebuilding. Endurance athletes land in the middle of the range since their training volume is high but muscle damage per session is lower.