Fitness calculators · 134 tools
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BMI, TDEE, 1RM, pace, FTP, heart-rate zones. Every formula is shown, every input is editable, and nothing leaves your browser.
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- BMI Calculator
- TDEE Calculator
- BMR Calculator (Mifflin-St Jeor)
- Reference Weight Formulas
- Waist-to-Hip Ratio Calculator
- Height Converter (cm to feet/inches)
- Weight Converter (kg to lbs)
- Distance Converter (km to miles)
- Speed Converter (MPH to km/h to m/s)
- Grade to Degrees Converter
- FTP Calculator (from 20-Min Test)
- Cycling Power Zones Calculator
- Cycling Power Calculator (Watts from Speed)
- Power-to-Weight Ratio Calculator
- Bike Gear Ratio Calculator
- Steps to Calories
- Calorie Burn: Running
- Calorie Burn: Walking
- Calorie Burn: Cycling
- Calorie Burn: HIIT & Circuit Training
- Max Heart Rate Calculator (220 Minus Age)
- Target Heart Rate Calculator
- Heart Rate Zones (Karvonen Method)
- Heart Rate Zones (% of Max)
- Max Heart Rate Comparison Calculator (4 Formulas)
- Calorie Deficit Planner
- Macro Split Calculator
- Protein Intake Calculator
- Water Intake Calculator
- Caffeine Half-Life Calculator
- Time-to-Goal Calculator (Weight)
- Weight Change Percentage Calculator
- Strength Progression Calculator
- Training Cycle Planner (Weeks/Deload)
- Personal Record Progression Calculator
- Running Pace Calculator
- Beep Test (20 m Shuttle Run)
- Cooper 12-Minute Run Test
- VDOT Calculator (Jack Daniels)
- Marathon Time Predictor
- One-Rep Max Calculator (Epley Formula)
- Barbell Plate Calculator (lbs)
- Strength Standards Calculator
- Barbell Plate Calculator (kg)
- Wilks Score Calculator
Reading
From the blog
Running
Age-Graded Running Performance Explained
Age grading turns a race time into a percentage of the standard for that age, sex and distance. A 49:30 ten kilometre is worked through to 70.7% at 58 and 53.3% at 24, with the two divisions behind it and the bands that read the result.
9 min read
Heart Rate Zones
Maximum Heart Rate: The 220-Minus-Age Formula and Its Limits
Maximum heart rate is a ceiling set mostly by age, not a measure of fitness. For a 55-year-old the three published formulas return 165, 170 and 158 bpm, and because zones are percentages that twelve-beat spread travels into every band built on top.
9 min read
Heart Rate Zones
Target Heart Rate: How to Find Your Training Range
A target heart rate is a percentage applied to a ceiling. On a 165 bpm maximum with a 60 bpm resting rate, moderate works out as 99 to 132 bpm by percentage of maximum and 102 to 122 by Karvonen, from the same person on the same day.
9 min read