20 tools for strength, cardio, nutrition, and body composition. Fast, accurate, and built for people who train seriously.
Calculate your max lift from any weight and rep count. Full training percentage table included.
Build a personalized training plan for your goal, schedule, and experience level.
Find your pace, finish time, or distance. Race predictions and per-km splits included.
Get your 5 training zones using the Karvonen formula. Find your fat-burn and threshold zones.
Estimate your aerobic capacity using resting HR or a 1.5-mile run. Includes fitness category.
MET-based calorie burn for 40+ activities. Running, cycling, swimming, HIIT, and more.
Calculate your BMR, TDEE, and calorie targets for loss, maintenance, or gain.
Dial in your protein, carb, and fat split with preset goals and per-meal breakdowns.
Find your optimal daily protein based on your goal, activity, and lean body mass.
Calculate your daily hydration needs based on weight, activity, and climate.
Generate your fasting schedule for 16:8, 18:6, 20:4, or OMAD based on your wake time.
Calculate your BMI and estimate body fat using the US Navy circumference method.
Find your ideal weight using four clinical formulas: Devine, Robinson, Miller, and Hamwi.
Calculate exactly how much fat to lose to reach your target body fat %, with a realistic timeline.
Calculate your lean mass — muscle, bone, organs — separate from body fat using 3 formulas.
Assess your cardiovascular health risk using WHO waist-to-hip ratio guidelines.
Find the best wake-up and bedtimes based on 90-minute sleep cycles for full rest.
Convert weight, height, distance, speed, pace, and temperature between metric and imperial.
How many calories does your workout actually burn? Pick from 40+ activities with MET values.
Set your calories and automatically split your macros across 2–6 meals per day.
No popups, no required accounts, no guesswork. Just tools that work.
Every calculator uses validated research formulas — Mifflin-St Jeor, Karvonen, Epley, and more.
Everything runs in your browser. No loading spinners, no server round-trips, no waiting.
Fully responsive. Use it on your phone at the gym or on desktop planning your week.
Your health data never leaves your device. No tracking of your weight or body metrics.