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Free Health & Fitness Tools
Estimate BMI, body fat, calories, hydration, sleep, and training targets for everyday planning.
Health calculators are planning aids, not medical diagnoses. These tools estimate BMI, body fat, calorie needs, hydration, sleep timing, and training targets from the numbers you enter. Results vary with age, health conditions, and activity, so use them alongside professional advice rather than as a replacement.
Body Fat Calculator
Estimate body fat percentage with the US Navy method.
Open toolIdeal Weight Calculator
Compare ideal weight ranges from several formulas.
Open toolWater Intake Calculator
Estimate a daily hydration goal based on weight and activity.
Open toolSleep Calculator
Find the best bedtimes and wake times around sleep cycles.
Open toolOvulation & Period Calculator
Predict fertile days, ovulation, and upcoming periods.
Open toolRunning Pace Calculator
Calculate pace, finish time, or distance for a run.
Open toolTDEE Calculator
Estimate your total daily energy expenditure from BMR and activity level.
Open toolMacronutrient Calculator
Split your daily calories into protein, carbohydrates, and fat targets.
Open toolOne-Rep Max Calculator
Estimate your one-rep max from a weight and rep count, with training percentages.
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