Fitness
Pace, one-rep max, heart-rate zones.
BMR Calculator
Calculate your basal metabolic rate (BMR) with the Mifflin-St Jeor equation. Enter weight, height, age and sex to see calories burned at rest per day.
Calories Burned Calculator
Estimate calories burned by activity, body weight and time. Uses MET values for running, cycling, walking, HIIT, swimming and more.
FFMI Calculator
Calculate your FFMI and height-normalized FFMI from weight, body fat and height. See your lean mass, fat mass and muscularity category instantly.
Heart Rate Zone Calculator
Find your five heart rate training zones from your age. Uses the 220 minus age or Tanaka formula, plus the Karvonen method if you add a resting heart rate.
One Rep Max Calculator
Estimate your one rep max from a weight and reps set. Uses the Epley and Brzycki formulas and gives a percentage table for programming working sets.
Race Time Predictor
Predict your 5K, 10K, half marathon and marathon times from one recent race using Riegel's formula. Enter a distance and finish time to see equivalents.
Running Pace Calculator
Work out your running pace per km and per mile plus speed in km/h and mph. Enter a distance and finish time to see splits and predict race times.
Sleep Cycle Calculator
Find the best time to go to bed or wake up. Plans around 90-minute sleep cycles so you wake between cycles feeling rested, not groggy. Free and private.
TDEE Calculator
Calculate your TDEE and daily calorie needs. Enter weight, height, age, sex and activity to see maintenance, cutting and bulking targets.
Wilks Calculator
Calculate your Wilks score from your total and bodyweight. Uses the original Wilks formula so lifters of any size can compare strength fairly.