Running Calculator

A free collection of running calculators for pace, marathon race time prediction, calories burned, and treadmill speed conversion.

Calculate Running Pace Predict Marathon Time

TL;DR

RunCalc is a free, no-install collection of running calculators that run right in your browser, instantly computing running pace, marathon race time predictions, calories burned, and treadmill speed.

All calculations happen in your browser and your inputs are never sent to or stored on a server. Results are estimates for reference.

Running Calculators

Running Pace Calculator

Enter distance and goal time to get your pace per km (min/km) and speed, or work backward from a pace to a finish time.

Marathon Race Time Predictor

Use a 5K or 10K result to predict your half and full marathon finish times with Riegel's formula.

Running Calorie Calculator

Estimate calories burned running from your weight, distance, and speed using a MET-based formula.

Treadmill Pace Converter

Convert treadmill speed (km/h) and pace (min/km) both ways and adjust pace for incline.

Running Guides

The Complete Guide to Running Pace & Race Prediction

From pace basics to marathon time prediction, calories burned, and treadmill conversion, all in one guide.

Calculate Your Pace Now

Just enter your distance and goal time to see your pace per km instantly.

Why Use RunCalc

Free & no install — use it right in your browser with no sign-up or app download.
No personal data collected — every calculation runs in your browser and inputs are never sent to a server.
Standard formulas — we apply widely used formulas: pace = time ÷ distance, the Riegel race prediction formula, and MET-based calorie estimates.
Open formulas — each calculator shows the formula, the method, and its limitations.

Every result is an estimate for reference; your real times and calories burned can vary with fitness, course, temperature, and individual differences.

Last updated: 2026-06-25