Free, Doctor-Guided Fitness Calculators
22 science-backed calculators across body composition, nutrition, performance and recovery, all metric & imperial.
Body Composition
8 toolsBMI Calculator
Body Mass Index + healthy weight range.
OpenBMI Prime
Ratio variation of BMI for clearer classification.
OpenBody Fat %
U.S. Navy body fat % and lean body mass.
OpenLean Body Mass
Body weight excluding fat.
OpenIdeal Weight
Devine, Hamwi, Robinson, Miller formulas.
OpenFFMI
Fat-Free Mass Index for advanced muscle analysis.
OpenWaist-to-Hip Ratio
Fat distribution & metabolic risk.
OpenBody Surface Area
Mosteller formula, a medical reference.
OpenNutrition & Energy
6 toolsTDEE Calculator
Total Daily Energy Expenditure.
OpenCalorie Deficit
Science-backed deficit for fat loss.
OpenMacro Calculator
Protein, carbs and fats, gram by gram.
OpenProtein Intake
Daily protein target for your goal.
OpenWater Intake
Daily hydration target.
OpenIntermittent Fasting
16:8, 18:6, OMAD windows.
OpenFitness & Performance
6 toolsOne Rep Max
Strength estimate with training % chart.
OpenHeart Rate Zones
Training zones for cardio & HIIT.
OpenVO₂ Max
Estimate your aerobic capacity.
OpenPace Calculator
Pace, speed & race time predictions.
OpenCalorie Burn
Calories burned for 15+ activities.
OpenSteps to Calories
Convert steps to distance & calories.
OpenWomen & Recovery
2 toolsCalculators are a starting point.
A doctor-guided plan considers your medical history, lifestyle, and goals, so book a free consultation to get yours.
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