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  Predict your race times for every distance from one recent result.

• Pace Calculator

  Turn a goal time into the exact pace you need, or a pace into a finish time.

• VDOT Calculator

  Find your VDOT score and Daniels training paces from a recent race.

• Age-Grading Calculator

  See your age-graded performance percentage for any race distance.

• Treadmill Converter

  Convert treadmill pace and incline to the equivalent road running pace.

• Calorie Calculator

  Estimate the calories you burn running any distance at your body weight.

• Heart Rate Zones

  Calculate your five running heart-rate training zones from your max HR.

• Predictions

  Browse race time predictions for every popular distance pairing.

• Blog

  Training and racing articles, written by runners for runners.

• Tutorials

  Step-by-step guides to the calculators and pace bands.

• About

  What this tool is, the formulas behind it, and who built it.

• Contact

  How to reach the people behind the site. Bug reports, prediction questions, and calculator ideas, all answered by email.

• Embed the tool

  Put the free race-time predictor on your own running blog or coaching page with one line of HTML. Free to use with a link back.

• Remove ads

  Go ad-free for a dollar a month or three dollars a year.

• Privacy

  How your data is handled. Spoiler: it stays on your device.

• Terms

  Terms of use for this site.