Calculators I built for runners. No signup, no catch. Pick one.
Predict your finish times from 5K to 100 miles off one recent race — plus your speed-vs-endurance profile and training paces.
Work out pace, time, or distance from any two — and get even-effort splits for race day.
Turn one race into your VDOT score and easy / marathon / threshold / interval / repetition paces.
Dial in carbs, fluid, and sodium per hour for your ultra, with an aid-station-by-aid-station plan.
These run on what you type in. Connect Strava and NavRun works from your real training instead.
Connect Strava, Start Free
