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Health & Fitness Calculators
Evidence-based health calculators to estimate Body Mass Index (BMI), U.S. Navy body fat percentage, Karvonen heart rate zones, daily calorie expenditure (TDEE), and optimal daily hydration.
Calculation.zone — Printable Estimate Sheet
10/24/2026Daily Water Intake
Daily Water Intake
Calculate recommended daily fluid intake based on body weight and activity level.
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Activity & Environment
lbs
min
Hydration Targets
Recommended Daily Intake
95oz
Approximately 11.9 cups or 2.8 liters daily
Baseline Needs83 ozResting body weight
Activity & Climate+12 ozSweat replenishment