Running · Cycling · Swimming
Less math, great training. We hope our calculators make all the difference in your next workout.
Tip: bookmark endurancecalculators.com for quick access on training days.
Pace converter, finish time, VDOT training zones, altitude adjustment
Power & HR zones, watts per kilo, altitude power, distance
Open water distance, pace conversion, pool course converter
Enter a recent race result to get your VDOT and Jack Daniels training paces.
Convert a race time between altitude and sea level. Uses a 2% adjustment per 1,000 ft above 3,000 ft — the standard model used by running coaches and sports medicine practitioners.
Enter your FTP as your best 60-minute power output, or take your best 20-minute power and multiply by 0.95.
Estimates your adjusted FTP and power zones at elevation for aerobic efforts. Based on peer-reviewed altitude physiology formulas. Note: anaerobic power (Z6–Z7) is not significantly affected by altitude.
Common race distances:
| 500 yards | 457.2 m |
| 880 yd (½ mile) | 804.7 m |
| 1760 yd (1 mile) | 1,609.3 m |
| 2.4 miles (Ironman) | 3,862.4 m |
| Olympic (1.5 km) | 1,640.4 yd |
Convert your pool pace between yards and meters.
Convert your pace between pool types. Times are adjusted for differences in pool length.