Fitness
BMI, calories, macros, and other health estimators.
- Calorie / TDEE CalculatorEstimate BMR (Mifflin–St Jeor) and daily calorie needs (TDEE).
- Heart Rate Zone CalculatorTraining zones from age (and optional resting HR via Karvonen).
- Macro Split CalculatorConvert daily calories into protein, carb, and fat grams.
- One-Rep Max CalculatorEstimate 1RM with the Epley formula and see percentage loads.
- Running Pace CalculatorConvert distance and time to pace, or pace and distance to finish time.
- Water Intake CalculatorEstimate daily water needs from weight, activity, and climate.