Health & Lifestyle
BMI, BMR, TDEE, calories, macros, protein, heart rate, and body composition estimates using validated scientific formulas with zero tracking.
Statistical health calculators based on established peer-reviewed physiological equations. We display the exact mathematical formulas used and highlight known clinical limitations so you can interpret results accurately.
Body composition and weight
Assess body mass index, estimate lean body mass with Boer/James/Hume formulas, calculate ideal body weight, and measure waist-to-hip cardiovascular ratios.
BMI Calculator
Calculate Body Mass Index (Metric & Imperial), healthy weight range, and Prime index.
Open the bmi calculatorBody Fat Percentage Calculator
Estimate body fat percentage, lean mass, and fat mass using US Navy formulas.
Open the body fat percentage calculatorLean Body Mass Calculator
Calculate lean body mass (LBM) and body fat mass percentage.
Open the lean body mass calculatorIdeal Body Weight Calculator
Estimate healthy body weight ranges based on height and frame.
Open the ideal body weight calculatorWaist-to-Hip Ratio Calculator
Assess body fat distribution and cardiovascular health risk.
Open the waist-to-hip ratio calculatorNutrition and energy expenditure
Calculate basal metabolic rate (BMR), total daily energy expenditure (TDEE), daily calorie deficits, macronutrient splits, protein targets, and hydration goals.
Calorie Deficit & Surplus Calculator
Determine daily calorie targets for weight loss or muscle gain.
Open the calorie deficit & surplus calculatorBMR Calculator
Calculate baseline daily calories burned at rest using the Mifflin-St Jeor formula.
Open the bmr calculatorTDEE Calculator
Calculate Total Daily Energy Expenditure and baseline metabolism.
Open the tdee calculatorDaily Calorie Intake Calculator
Determine maintenance, weight loss, or bulking calorie targets.
Open the daily calorie intake calculatorMacronutrient Ratio Calculator
Distribute daily calories across protein, carbs, and fats.
Open the macronutrient ratio calculatorDaily Protein Intake Calculator
Estimate target daily protein grams for muscle building and fitness.
Open the daily protein intake calculatorDaily Water Intake Calculator
Calculate daily hydration and water intake requirements.
Open the daily water intake calculatorFitness, sleep and longevity
Estimate one-rep max strength loads, determine target heart rate zones, calculate running paces, convert steps to calories, plan sleep cycles, and evaluate smoking costs.
One Rep Max (1RM) Calculator
Estimate maximum lift capacity for bench, squat, and deadlift.
Open the one rep max (1rm) calculatorTarget Heart Rate Zone Calculator
Determine cardio training heart rate zones for fat burn and peak endurance.
Open the target heart rate zone calculatorRunning Pace & Finish Time Calculator
Calculate target running pace per mile or kilometer.
Open the running pace & finish time calculatorSteps to Calories Converter
Convert daily step counts to estimated calorie burn and miles walked.
Open the steps to calories converterSleep Cycle & Bedtime Planner
Find optimal sleep cycles and bedtime wake-up windows.
Open the sleep cycle & bedtime plannerOvulation & Fertility Calculator
Estimate ovulation dates and peak fertile windows.
Open the ovulation & fertility calculatorSmoking Lifetime Cost Calculator
Calculate total money spent on cigarettes and future savings.
Open the smoking lifetime cost calculatorLife Horizon Illustration
Visualize time to a hypothetical planning age, not a predicted lifespan.
Open the life horizon illustrationEverything else in this category
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Local-first by design
Every tool on this page runs entirely in your browser. Your files and data never leave your device — no uploads, no server processing, no tracking. Works offline after first load.