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Both calculators run independently — change the inputs on either side to compare results.

Water Usage

Daily Water Intake Calculator

Estimate the daily water intake (in liters) a person should target based on body weight and physical activity level. Use this as a starting point for hydration planning, not a medical prescription.

Fill in the required fields to see your result.
Health

BMR / TDEE Calculator

Estimate your daily calorie needs using the revised Harris-Benedict equation, then adjust for activity to get your Total Daily Energy Expenditure (TDEE) — the rough number of calories you burn in 24 hours when you eat a maintenance diet. Enter your weight in kilograms, height in centimetres, age, biological sex, and an activity multiplier (sedentary 1.2, lightly active 1.375, moderately active 1.55, very active 1.725, extremely active 1.9). The result is what most nutrition guides call your "maintenance calories" — a starting point for designing a deficit (to lose weight), a surplus (to gain muscle), or a recomposition plan.

Fill in the required fields to see your result.

Key differences

Daily Water Intake CalculatorBMR / TDEE Calculator
CategoryWater UsageHealth
Inputs required25
ResultDaily Water Intake (liters)Daily Calorie Needs (calories)
What it doesEstimate the daily water intake (in liters) a person should target based on body weight and physical activity level. Use this as a starting point for hydration planning, not a medical prescription.Estimate your daily calorie needs using the revised Harris-Benedict equation, then adjust for activity to get your Total Daily Energy Expenditure (TDEE) — the rough number of calories you burn in 24 hours when you eat a maintenance diet. Enter your weight in kilograms, height in centimetres, age, biological sex, and an activity multiplier (sedentary 1.2, lightly active 1.375, moderately active 1.55, very active 1.725, extremely active 1.9). The result is what most nutrition guides call your "maintenance calories" — a starting point for designing a deficit (to lose weight), a surplus (to gain muscle), or a recomposition plan.