Free browser-based health and fitness calculators — BMI, body fat, daily calories, macros, TDEE, one-rep max, running pace, heart rate zones, sleep, water intake, ideal weight, ovulation, and pregnancy due date. Your numbers never leave the browser.
Calculate Total Daily Energy Expenditure and macro splits for cutting, maintenance, or bulking.
Launch ToolEstimate 1RM using 5 formulas (Epley, Brzycki, Lombardi, Mayhew, O'Conner) with training percentages.
Launch ToolCalculate running pace per mile/km and predict race times for 5K, 10K, half, and full marathon.
Launch ToolWhether you are cutting, bulking, building a marathon training block, or just figuring out whether you are sleeping enough — these calculators turn the standard formulas into a number you can plan around. Coverage spans nutrition, body composition, strength, cardio, recovery, and reproductive health.
Nutrition: calorie, macro, TDEE, water intake. Body composition: BMI, body fat, ideal weight. Strength: one-rep max with five formula options. Cardio: heart rate zones, running pace, race-time predictor. Recovery: sleep cycle calculator. Reproductive: ovulation and pregnancy due date.
Health data is among the most sensitive information you own — your weight, your cycle dates, your heart-rate zones, your body-fat percentage. Most fitness calculators either email you a"result" that someone now has on file, or push you toward a signup that funnels the inputs into an ad-targeting profile. ToolWise keeps every calculation on the device: type your numbers, read the result, and nothing leaves the tab.
Your weight, height, and cycle dates stay on your device — no server, no tracking, no public profile.
Mifflin-St Jeor, Epley, Brzycki, Karvonen, US Navy body-fat — these calculators use peer-reviewed formulas.
Every health calculator here is free forever — no subscriptions, no daily limits, no signup wall.