# Running Pace Calculator Calculate your running pace per km and mile, average speed, and predicted finish times for 5K, 10K, half marathon, and marathon distances using the Riegel. ## What this calculates Whether you are training for a race or tracking your fitness, knowing your pace is essential. Enter your distance and time to calculate your pace, speed, and predicted finish times for standard race distances using the Riegel race prediction formula. ## Inputs - **Distance** (km) — min 0.1, max 200 - **Total Time** (minutes) — min 1, max 1440 — Total time in minutes (e.g., 25.5 for 25min 30sec) ## Outputs - **Pace (min/km)** — formatted as text — Your pace in minutes per kilometer - **Pace (min/mile)** — formatted as text — Your pace in minutes per mile - **Speed** — Average running speed in km/h - **Race Finish Predictions** — formatted as text — Estimated finish times for standard race distances ## Details Running pace is typically expressed as minutes per kilometer (min/km) or minutes per mile (min/mi). It is the inverse of speed and gives runners a practical measure of how fast they are covering distance. Most runners find it easier to think in terms of pace rather than speed when planning training sessions and race strategies. The race predictions use the Riegel formula (T2 = T1 x (D2/D1)^1.06), developed by Peter Riegel in 1977 and refined over decades. This formula accounts for the fact that running pace naturally slows as distance increases, using an exponent of 1.06 to model this fatigue factor. The formula is most accurate when predicting races of similar length to your input distance. For competitive runners, pace training zones are typically defined relative to race pace: easy runs at 60-70% effort (about 60-90 seconds slower per km than race pace), tempo runs at 80-90% effort (about 15-30 seconds slower), and interval training at 95-105% of race pace. Understanding your current pace allows you to set appropriate training intensities for improvement. ## Frequently Asked Questions **Q: What is a good running pace?** A: A good pace depends on your experience, age, and fitness level. For reference, a 5:00 min/km (8:02 min/mi) pace is considered solid for recreational runners. Competitive runners often aim for 4:00-4:30 min/km. Beginners might start at 7:00-8:00 min/km. Rather than comparing yourself to others, focus on improving your own pace over time. Any pace that keeps you running consistently is a good pace. **Q: How accurate are the race predictions?** A: The Riegel formula provides reasonable estimates when predicting races within 2-3x of your input distance. Predicting a marathon from a 5K time is less accurate than predicting a 10K time. The formula assumes consistent training and does not account for course elevation, weather, or race-day conditions. Use these predictions as training targets and adjust based on your specific circumstances and course profile. **Q: Should I train at my race pace?** A: Most of your training (about 80%) should be done at an easy, conversational pace, which is typically 60-90 seconds per km slower than your target race pace. Only about 20% of your training should be at or faster than race pace. This polarized training approach, supported by extensive research, builds aerobic capacity while minimizing injury risk and overtraining. Quality speed work combined with ample easy running produces the best results. **Q: How can I improve my running pace?** A: Improving your pace requires a combination of consistent mileage, structured speed work, and adequate recovery. Key workouts include tempo runs (sustained effort at 80-90% intensity), interval training (repeated faster efforts with rest periods), and long runs for endurance. Increasing your weekly mileage gradually (no more than 10% per week) provides the aerobic foundation for faster speeds. Strength training and proper nutrition also contribute to pace improvement. --- Source: https://vastcalc.com/calculators/sports/running-pace Category: Sports & Fitness Last updated: 2026-04-21