Cardio & Endurance Calculators

10K Pace Calculator

Calculate your target pace, finish time, and splits for a 10K race fro…

5K Pace Calculator

Calculate your 5K finish time, required pace per mile or kilometer, an…

Beep Test Score Calculator

Estimates VO2 max from your 20m multi-stage fitness (beep) test level …

Calories Burned Calculator

Calculates calories burned during physical activity using the MET (Met…

Cameron Race Time Predictor

Predicts your finish time for a target race distance using the Cameron…

Critical Swim Speed Calculator

Calculate Critical Swim Speed (CSS) from two timed trial distances to …

Cycling Power Zones Calculator

Calculate your 7 cycling training power zones from your Functional Thr…

Functional Threshold Power (FTP) Calculator

Estimates Functional Threshold Power (FTP) from a 20-minute maximal cy…

Half Marathon Pace Calculator

Calculate your required pace, finish time, or total speed for a half m…

Heart Rate Recovery Calculator

Calculates heart rate recovery (HRR) after exercise to assess cardiova…

Heart Rate Reserve Calculator

Calculate Heart Rate Reserve (HRR) and target training zones using the…

Karvonen Heart Rate Calculator

Calculate target heart rate training zones using the Karvonen (heart r…

Lactate Threshold Calculator

Estimates lactate threshold heart rate and pace using maximum heart ra…

Marathon Pace Calculator

Calculate your required pace per mile or kilometer to finish a maratho…

Marathon Time Predictor

Predicts your marathon finish time based on a recent race performance …

Maximum Heart Rate Calculator

Estimate your maximum heart rate (MHR) using age-based formulas and ca…

Open Water Swim Pace Calculator

Calculate your open water swimming pace, estimated finish time, or tar…

Race Pace Predictor

Predicts your finish time and required pace for a target race distance…

Race Splits Calculator

Calculate even, negative, or positive race splits for any distance to …

Riegel Race Time Predictor

Predicts your finish time for a new race distance based on a known rac…

Running Cadence Calculator

Calculate running cadence (steps per minute), stride length, and optim…

Running Pace Calculator

Calculates running pace (time per unit distance), finish time, or tota…

Sweat Rate Calculator

Calculates an athlete's sweat rate during exercise to guide personaliz…

Swim Pace per 100m Calculator

Calculate your swimming pace per 100 metres from total distance swum a…

Swimming Pace Calculator

Calculates swimming pace per 100 metres or yards, total swim time, and…

Target Heart Rate Calculator

Calculate your target heart rate zone for aerobic and anaerobic exerci…

Training Heart Rate Zones Calculator

Calculate your 5 training heart rate zones using the Karvonen formula …

VO2 Max Beep Test Calculator

Estimate VO2 max from your beep test (20m shuttle run) level and shutt…

VO2 Max Cooper Test Calculator

Estimate your VO2 max from the Cooper 12-minute run test using the val…

VO2 Max Rockport Walk Test Calculator

Estimate your VO2 max from the Rockport 1-Mile Walk Test using time, h…

Weekly Mileage Progression Calculator

Calculate safe weekly running mileage progression using the 10% rule o…