Health & Fitness Calculators
From calorie targets and macro splits to VO₂ max and pregnancy milestones — 39 free calculators built on the same formulas used by dietitians, trainers, and clinicians.
BMI Calculator
Body mass index by height and weight — understand what the number means for your health.
BMR Calculator
Basal metabolic rate — how many calories your body burns at complete rest.
TDEE Calculator
Total daily energy expenditure based on activity level — your real calorie target.
Calorie Calculator
Daily calorie needs for your age, sex, height, weight, and activity.
Calorie Deficit Calculator
How big a deficit do you need to hit your weight loss goal by a target date?
Calorie & Macro Counter
Track protein, carbs, and fat targets alongside your daily calorie budget.
Calories Burned Calculator
Estimate calories burned during any activity by weight, duration, and intensity.
Macro Calculator
Optimal protein, carb, and fat split for your goal — cut, bulk, or maintain.
Protein Calculator
Daily protein target based on body weight, activity, and muscle-building goals.
Water Intake Calculator
Daily hydration needs based on your weight, climate, and exercise habits.
Ideal Weight Calculator
Healthy weight range estimates using Hamwi, Devine, and BMI methods.
Body Fat Calculator
Estimate body fat percentage using waist, hip, and neck measurements.
Waist-Hip Ratio
A stronger health predictor than BMI — calculate your cardiovascular risk ratio.
Heart Rate Calculator
Max heart rate and training zones for fat burn, cardio, and peak performance.
Resting Heart Rate
What your resting heart rate says about your cardiovascular fitness level.
VO₂ Max Calculator
Estimate aerobic fitness capacity from heart rate or a simple run test.
One Rep Max Calculator
Estimate your 1RM for any lift and calculate percentages for training sets.
Pace Calculator
Running pace, finish time, and distance — convert between min/mile and min/km.
Mile Pace Calculator
Target mile pace for any race distance from 5K to marathon.
Sleep Calculator
Optimal bedtime and wake time based on sleep cycles to avoid grogginess.
Metabolism Calculator
Compare your metabolic rate to average and see what affects your calorie burn.
Carb Cycling Calculator
High, medium, and low carb day targets for performance and body composition.
Vitamin D Calculator
Estimate your vitamin D needs and sun exposure time by skin tone and latitude.
Insulin Resistance Calculator
HOMA-IR score from fasting glucose and insulin to flag metabolic risk.
LDL Cholesterol Calculator
Friedewald equation estimate of LDL from a standard lipid panel.
Due Date Calculator
Estimated due date, trimester timeline, and weekly milestones from LMP or conception.
Ovulation Calculator
Fertile window and ovulation date based on cycle length and last period.
Menstrual Cycle Calculator
Next period prediction, average cycle length, and phase breakdown.
Pregnancy Weight Gain
Healthy weight gain ranges by pre-pregnancy BMI and trimester.
Pregnancy Size Calculator
Baby size, weight, and development milestones by week of pregnancy.
Time Pregnant Calculator
How many weeks and days pregnant you are from your last menstrual period.
Weeks Pregnant Calculator
Weeks pregnant from due date — with trimester and key milestone dates.
Age Calculator
Exact age in years, months, and days. Useful for medical forms and life events.
Dog Age Calculator
Convert your dog's age to human years — accounting for breed size differences.
GPA Calculator
Calculate GPA by course credits and letter grades for any semester or cumulative.
Grade Calculator
What grade do you need on your final to hit your target course grade?
Percentage Calculator
Percent of a number, percent change, and what percent X is of Y.
Date Calculator
Days between dates, add or subtract days, and find a date N days from now.
Metric Converter
Convert between metric and imperial for common health measurements.