Your Complete Fitness Calculator Suite
Calculate your one-rep max, bicep size potential, daily calories, and more with science-backed fitness formulas. Built for strength training, bodybuilding, and everyday fitness goals.
Free, instant results. No sign-up required. All calculations run locally in your browser.
📊 1RM Estimator
Calculate your estimated one-rep max using the Brzycki, Epley, and Lander formulas. Works for bench press, squat, deadlift, and any lift.
→ Open Calculator💪 Bicep Size Potential
Estimate your ideal arm size and genetic ceiling using the Steve Reeves formula based on wrist circumference.
→ Open Calculator🍽️ TDEE & Macros
Calculate daily calories and a macro breakdown for bulking, cutting, or maintenance using the Mifflin-St Jeor equation.
→ Open Calculator🏆 Strength Standards
Compare your bench, squat, and deadlift to proven standards. See whether you're novice, intermediate, advanced, or elite.
→ Open Calculator📏 BMI Calculator
Calculate your Body Mass Index to assess weight relative to height, with category breakdowns.
→ Open Calculator📊 Body Fat % Estimator
Estimate body fat percentage with the U.S. Navy circumference method using neck, waist, and height.
→ Open Calculator6
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Science-backed fitness math, in one place
BicepCalc brings together the calculators lifters actually use, each built on an established formula rather than guesswork. Estimate your one-rep max from a working set, set calorie and macro targets for a cut or bulk, check where your lifts fall against common strength standards, and track body composition over time.
Every tool runs entirely in your browser. Nothing you type is sent to a server, stored, or shared. Pick a calculator above to get started, or read the frequently asked questions to understand how each formula works and where its limits are.