Health and Fitness
Calculators for tracking health and well-being.
Energy Availability Calculator
Estimate energy availability from intake, exercise expenditure, body weight, body fat percentage, and a target availability level.
Race Fueling Plan Calculator
Plan carbohydrate, fluid, sodium, and gel needs for an endurance race using hourly targets and event duration.
Sleep Efficiency and Recovery Calculator
Estimate sleep efficiency, resting-heart-rate drift, and a simple recovery score from time in bed, sleep time, awakenings, and baseline pulse.
Training Monotony and Strain Calculator
Analyze seven days of training load to estimate weekly load, daily variation, monotony, and strain.
Body Composition Goal Calculator
Estimate target body weight and weeks needed for a body-fat goal while accounting for planned lean-mass change.
Cycling Power Zones Calculator
Estimate normalized power, training stress, watts per kilogram, and cadence-adjusted torque from FTP and workout intensity.
Running Critical Speed Calculator
Estimate critical speed, anaerobic distance reserve, target time, and target pace from two race or time-trial performances.
Heat Strain Training Calculator
Estimate apparent temperature, heat strain score, fluid need, and adjusted training duration from temperature, humidity, pace, and acclimation.
Protein Distribution Calculator
Split a daily protein target across meals and estimate leucine per meal against a practical leucine threshold.
Recovery Carb Refill Calculator
Estimate carbohydrate refill needs after a session using body weight, duration, intensity, recovery window, and hourly intake rate.
Lactate Threshold Pace Calculator
Lactate Threshold Pace Calculator estimates endurance load, energy cost, hydration need, and environmental adjustment.
Altitude Pace Adjustment Calculator
Altitude Pace Adjustment Calculator estimates endurance load, energy cost, hydration need, and environmental adjustment.
Heat Training Risk Calculator
Heat Training Risk Calculator estimates endurance load, energy cost, hydration need, and environmental adjustment.
Marathon Fueling Calculator
Marathon Fueling Calculator estimates endurance load, energy cost, hydration need, and environmental adjustment.
Critical Power Calculator
Critical Power Calculator combines load, repetitions, sets, weekly frequency, and recovery into strength and volume metrics.
Power-to-Weight Calculator
Power-to-Weight Calculator combines load, repetitions, sets, weekly frequency, and recovery into strength and volume metrics.
Strength Volume Tonnage Calculator
Strength Volume Tonnage Calculator combines load, repetitions, sets, weekly frequency, and recovery into strength and volume metrics.
Wilks-Style Strength Score Calculator
Wilks-Style Strength Score Calculator combines load, repetitions, sets, weekly frequency, and recovery into strength and volume metrics.
Protein Periodization Calculator
Protein Periodization Calculator converts body mass, training volume, calories, and macro targets into daily nutrition numbers.
Glycogen Storage Calculator
Glycogen Storage Calculator converts body mass, training volume, calories, and macro targets into daily nutrition numbers.
Marathon Carb Load Calculator
Marathon Carb Load Calculator converts body mass, training volume, calories, and macro targets into daily nutrition numbers.
Body Recomposition Macro Calculator
Body Recomposition Macro Calculator converts body mass, training volume, calories, and macro targets into daily nutrition numbers.
Injury Risk Load Ratio Calculator
Injury Risk Load Ratio Calculator blends sleep, HRV, soreness, stress, heart rate, and training load into a readiness estimate.
HRV Readiness Calculator
HRV Readiness Calculator blends sleep, HRV, soreness, stress, heart rate, and training load into a readiness estimate.
Sleep Debt Performance Calculator
Sleep Debt Performance Calculator blends sleep, HRV, soreness, stress, heart rate, and training load into a readiness estimate.
Taper Volume Calculator
Taper Volume Calculator blends sleep, HRV, soreness, stress, heart rate, and training load into a readiness estimate.
FFMI Calculator
FFMI Calculator estimates body-composition direction, daily energy target, and timeline from anthropometric inputs.
Body Fat Change Timeline Calculator
Body Fat Change Timeline Calculator estimates body-composition direction, daily energy target, and timeline from anthropometric inputs.
Zone 2 Volume Calculator
Zone 2 Volume Calculator estimates body-composition direction, daily energy target, and timeline from anthropometric inputs.
Race Split Planner
Race Split Planner estimates body-composition direction, daily energy target, and timeline from anthropometric inputs.
Training Load Calculator
Estimate heart-rate based training load using duration, resting heart rate, max heart rate, and average heart rate.
Cooper Test VO2 Max Calculator
Estimate VO2 max from the distance covered during a 12-minute Cooper test.
Race Time Predictor
Predict a target race time from a recent performance using the Riegel endurance model.
Body Roundness Index Calculator
Estimate Body Roundness Index from waist circumference and height.
Relative Strength Calculator
Estimate one-rep max and relative strength from lifted weight, reps, and body weight.
Calorie Cycling Calculator
Plan high- and low-calorie days while preserving a weekly calorie target.
Sweat Rate Calculator
Estimate sweat rate from body weight change, fluid intake, urine, and exercise duration.
Running VO2 Cost Calculator
Estimate oxygen demand and calories from running pace, grade, and body weight.
Metabolic Age Estimator
Compare measured BMR with expected BMR and estimate a simple metabolic-age signal.
Hydration Sodium Calculator
Estimate fluid and sodium replacement from sweat rate, duration, sodium concentration, and replacement target.
Recovery Carb Load Calculator
Estimate post-training carbohydrate needs from body weight, training time, and grams per kilogram per hour.
TDEE Calculator
Estimate daily maintenance calories from BMR and activity multiplier.
Protein Intake Calculator
Estimate daily protein target from body weight and grams per kilogram.
Carbohydrate Intake Calculator
Calculate carbohydrate grams from calories and target carbohydrate share.
Fat Intake Calculator
Calculate daily fat grams from calories and target fat percentage.
Heart Rate Zones Calculator
Estimate training zones from maximum heart rate and selected intensity range.
Sleep Cycle Calculator
Estimate sleep time from cycle length, number of cycles, and time to fall asleep.
Walking Calories Calculator
Estimate calories burned while walking from body weight, distance, and grade.
Cycling Calories Calculator
Estimate cycling calories from body weight, duration, and MET intensity.
Workout Hydration Calculator
Estimate fluid needs from workout duration, sweat rate, and fluid already consumed.
Pace to Speed Calculator
Convert running pace in minutes per kilometre to speed and race time.
BMI Prime Calculator
Compare BMI with the common upper reference value of 25 using BMI Prime.
Lean Body Mass Calculator
Estimate lean body mass from weight and body fat percentage.
Maximum Heart Rate Calculator
Estimate maximum heart rate with common age-based formulas.
VO2 Max Pace Estimator
Estimate oxygen cost and VO2 demand from running speed.
Water Intake Calculator
Estimate daily water needs from body weight, activity time, and extra climate allowance.
Macro Calculator
Convert calorie targets and macro percentages into grams of protein, carbohydrate, and fat.
One-Rep Max Calculator
Estimate one-repetition maximum strength from a lifted weight and repetitions completed.
Running Pace Calculator
Calculate pace, speed, total time, and marathon projection from distance and finish time.
Target Heart Rate Calculator
Estimate training heart rate from age, resting heart rate, and desired intensity.
Waist-to-Hip Ratio Calculator
Calculate waist-to-hip and waist-to-height ratios from simple body measurements.
Body Surface Area Calculator
Estimate body surface area with Mosteller, Du Bois, and Haycock formulas.
Steps to Calories Calculator
Estimate walking distance, calories, and time from step count, stride length, and body weight.
BMI Calculator
Calculate your Body Mass Index and check your weight category.
BMR and TDEE Calculator
Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure using Mifflin-St Jeor and Harris-Benedict formulas.
Calorie Deficit & Weight Loss Time Calculator
Calculate how long it will take to reach your weight goal based on your calorie deficit. See visual predictions and graphs.
Body Fat Percentage (Deurenberg)
Calculate your body fat using BMI - simple method.
Body Fat Percentage (US Navy)
Calculate your body fat accurately using circumference measurements - more reliable method.
Pregnancy Calculator
Estimate your due date, gestational age, and upcoming appointments with three calculation methods.
Ovulation & Fertility Calculator
Estimate your next ovulation, fertile window, and upcoming period dates.
BAC Calculator - Blood Alcohol Content
Calculate estimated blood alcohol level, drinking window, and time until sober.
Ideal Weight Calculator
Calculate your ideal weight using three different formulas (Devine, Robinson, Hamwi).