Health & Fitness Calculators
Understand your body with BMI, BMR, body-fat and calorie tools, plan fitness and pregnancy milestones, and check hydration, sleep and clinical dosing safely.
20 free tools · no sign-up, no adsAge Calculator
Find your exact age in years, months, days, and even seconds.
Health CalculatorBMI Calculator
Check your Body Mass Index and understand your health range.
Health CalculatorBMR Calculator
Calculate resting calories and daily energy needs.
Health CalculatorBody Fat Percentage
Estimate body fat percentage using Navy standards.
Health CalculatorCalorie Calculator
Daily calorie needs based on activity level.
Health CalculatorCalories Burned
Calories burned across 25+ activities.
Health CalculatorDaily Water Intake
Calculate your recommended daily hydration targets.
Health CalculatorDehydration Calculator
Estimate fluid deficit and the water needed to rehydrate.
Health CalculatorDiet Carbon & Water Footprint
See the CO2 and water hidden in your weekly diet.
Health CalculatorHeart Rate Zones
Target training zones from your max heart rate.
Health CalculatorIdeal Body Weight
Find target ideal weight ranges based on height and gender.
Health CalculatorInsulin Dose Calculator
Calculate mealtime insulin from carbs and correction factor.
Health CalculatorOvulation Calculator
Predict fertile windows and next periods.
Health CalculatorPediatric Dose Calculator
Convert adult doses into safe child doses by weight and BSA.
Health CalculatorPregnancy Due Date
Calculate baby due dates and track gestational milestones.
Health CalculatorRunning Pace
Compute pace, time, or distance for runs and races.
Health CalculatorScreen Time Impact
See what your daily screen hours add up to over a year.
Health CalculatorSleep Calculator
Find the best bedtimes based on sleep cycles.
Health CalculatorSleep Cycle Calculator
Find the best bedtime and wake time from 90-minute cycles.
Health CalculatorTDEE & Goal Weight
Get maintenance calories and a realistic goal-weight timeline.
Health CalculatorExplore Other Categories
Climate & Sustainability Calculators
Carbon, energy, water & green living.
15 calculatorsUnit & Conversion Calculators
Units, currencies, time zones & measurements.
11 calculatorsDeveloper & Web Tools
Encoding, hashing, JSON, regex & web utilities.
25 calculatorsEducation & Student Calculators
Grades, GPA, percentage & study helpers.
16 calculatorsFinancial Calculators
Loans, investments, tax, salary & money planning.
37 calculatorsHealth & Fitness Calculators
BMI, calories, fitness, pregnancy & medication.
20 calculatorsMath Calculators
Numbers, algebra, geometry & everyday arithmetic.
26 calculators