Running calculators

Daniels/Gilbert math, straight from the open-source engine. No sign-up, everything runs in your browser.

Distance and time in — pace, speed and even splits out. min/km or min/mile.

Turn one real race result into your easy, threshold, interval and race paces.

What your 5K says about your marathon — equivalent performances across distances.

Looking for a whole schedule instead? The free training plans lay out every week from today to race day.