Your Fitness. Calculated.
Macro targets, TDEE, protein needs, and creatine dosing, calculated instantly using peer-reviewed formulas. No paywalls. No email gates. No BS.
Start with Macro CalculatorAll Calculators
Start with any calculator. Results link together automatically.
Macro Calculator
Calculate your optimal protein, carbs, and fat targets based on your goal: weight loss, maintenance, or muscle gain.
TDEE Calculator
Find your Total Daily Energy Expenditure: the exact number of calories your body burns each day.
Protein Calculator
Determine your ideal daily protein intake based on your weight, activity level, and fitness goal.
Creatine Calculator
Find your optimal creatine dose for maintenance or loading phase, calibrated to your body weight.
Calorie Deficit Calculator
Get your exact calorie target for weight loss. Choose a mild, moderate, or aggressive deficit, with weekly projections.
Built for people who care about accuracy
Most fitness calculator sites use outdated or simplified formulas. Every calculator on FitnessCalc uses the current gold-standard equations: Mifflin-St Jeor for BMR, peer-reviewed protein targets, and evidence-based supplement dosing.
- Mifflin-St Jeor BMR equation (more accurate than Harris-Benedict)
- Protein targets from ISSN position stand
- Creatine dosing from ISSN creatine supplementation review
- All formulas explained with sources