The all-in-one running calculator for pace, splits, and race predictions.

Whether you're training for a 5K, 10K, half marathon, or full marathon, Running Pace Calculator gives you the tools to plan your runs and predict your race times.

Pace Calculator
Calculate your running pace, finish time, or distance instantly. Enter any two values and get the third. Perfect for planning training runs or setting race day goals. Supports both min/km and min/mile.

Split Calculator
Create detailed split times for any distance. Choose equal splits or plan a negative split strategy to finish strong. Ideal for marathon pacing, half marathon splits, or interval training. Customize individual segments to match your race plan.

Race Predictor
Predict your finish time for any distance based on a recent race result. Uses the proven Riegel formula trusted by coaches worldwide. Optionally add your training volume and quality for a more accurate, personalized prediction.

HR Zone Calculator
Calculate your heart rate training zones based on max heart rate. Train smarter by targeting the right intensity for easy runs, tempo efforts, and race pace sessions.

Key Features
• Calculate pace, time, or distance from any two inputs
• Generate split times for any race distance
• Negative and positive split strategies
• Race time predictions using the Riegel formula
• Heart rate zone calculator for targeted training
• Support for kilometers and miles
• Works offline — no account required
• Available in English, German, Spanish, French, and Portuguese

Built for Runners
No bloat, no GPS tracking, no sign-up. Just fast, accurate calculations for your training and race day. From couch-to-5K beginners to experienced marathoners, this app helps you run smarter.

Common distances supported: 1K, 1 mile, 5K, 10K, 15K, 10 miles, 20K, half marathon (21.1K / 13.1 mi), 30K, full marathon (42.2K / 26.2 mi), 50K, and custom distances.