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⚠️ Disclaimer: Pace calculations are based on mathematical formulas. The Riegel race predictor assumes consistent race-specific training. Individual performance varies based on fitness level, weather, terrain, and race-day conditions. Results are for training planning purposes only.
Sources & Methodology
All formulas sourced from peer-reviewed research. Race distance constants use official World Athletics specifications.
Riegel, P. (1981). Athletic records and human endurance. American Scientist, 69(3), 285-290.
Original publication of the Riegel race prediction formula: T2 = T1 × (D2/D1)^1.06. The exponent 1.06 accounts for the physiological cost of maintaining pace over longer distances. Validated across elite and recreational athletes across all distance running events.
World Athletics (IAAF). Official Race Distance Specifications, 2024.
Official race distances: 5K = 5.000 km, 10K = 10.000 km, Half Marathon = 21.0975 km, Marathon = 42.195 km. All distance calculations use these official values.
Daniels, J. (2014). Daniels' Running Formula, 3rd Edition. Human Kinetics.
Training pace zones (easy, tempo, marathon pace, interval, repetition) used in the training pace output section. Daniels' VDOT system is the industry standard for pace-based running prescription.
Methodology:
Pace (min/mile) = Total time (min) / Distance (miles) Speed (mph) = 60 / Pace (min/mile) Riegel Prediction: T2 = T1 × (D2 / D1)^1.06 Negative split: First half at pace + 3s/mile; second half at pace - 3s/mile Official conversions: 1 mile = 1.60934 km | 5K = 3.10686 mi | HM = 13.10938 mi | Marathon = 26.21875 mi
Pace (min/mile) = Total time (min) / Distance (miles) Speed (mph) = 60 / Pace (min/mile) Riegel Prediction: T2 = T1 × (D2 / D1)^1.06 Negative split: First half at pace + 3s/mile; second half at pace - 3s/mile Official conversions: 1 mile = 1.60934 km | 5K = 3.10686 mi | HM = 13.10938 mi | Marathon = 26.21875 mi
Last reviewed: April 2026
Running Pace Calculator — Complete Guide for Every Distance
Whether you are training for your first 5K or targeting a marathon PR, understanding running pace is the foundation of every training plan and race strategy. Our calculator goes beyond every competitor by offering five complete calculation modes — find pace, find finish time, find distance, generate race splits, and predict race times using the Riegel formula — all on a single page.
How to Calculate Running Pace
Running pace, finish time, and distance have a simple three-way relationship. Know any two values and you can calculate the third:
Pace (min/mile) = Total time (minutes) / Distance (miles)
Finish time = Pace (min/mile) × Distance (miles)
Distance = Total time (minutes) / Pace (min/mile)
Speed (mph) = 60 / Pace (min/mile)
Speed (km/h) = 60 / Pace (min/km)
Example — 5K in 25:00: Distance in miles = 5 / 1.60934 = 3.107 miles
Pace = 25 / 3.107 = 8:03 per mile | Pace = 25 / 5 = 5:00 per km
Speed = 60 / 8.05 = 7.46 mph
Pace = 25 / 3.107 = 8:03 per mile | Pace = 25 / 5 = 5:00 per km
Speed = 60 / 8.05 = 7.46 mph
Pace Chart for Common Race Times
This reference table shows the per-mile pace required to achieve common goal times for each distance — the most searched data point for runners planning their race strategy:
| Goal Time | 5K Pace | 10K Pace | Half Marathon Pace | Marathon Pace |
|---|---|---|---|---|
| Under 20 min 5K | 6:26/mi | — | — | — |
| Under 25 min 5K | 8:03/mi | — | — | — |
| Under 30 min 5K | 9:39/mi | — | — | — |
| Under 45 min 10K | — | 7:15/mi | — | — |
| Under 60 min 10K | — | 9:39/mi | — | — |
| Sub-2:00 half | — | — | 9:09/mi | — |
| Sub-1:45 half | — | — | 8:00/mi | — |
| Sub-4:00 marathon | — | — | — | 9:09/mi |
| Sub-3:30 marathon | — | — | — | 8:00/mi |
| Sub-3:00 marathon | — | — | — | 6:51/mi |
| Boston Qualifier (M 18-34) | — | — | — | 6:51/mi |
The Riegel Race Predictor Formula
The Riegel formula (Peter Riegel, 1981, American Scientist) is the gold standard for predicting race times across distances. It is used by coaches, training apps, and race organizers worldwide:
T2 = T1 × (D2 / D1)^1.06
Example — 25-minute 5K predicting marathon:
T2 = 25 × (42.195 / 5)^1.06 = 25 × 8.439^1.06 = 25 × 9.30 = 232.5 minutes = 3:52:30
Example — 50-minute 10K predicting half marathon:
T2 = 50 × (21.0975 / 10)^1.06 = 50 × 2.1098^1.06 = 50 × 2.188 = 109.4 minutes = 1:49:24
The exponent 1.06 (not 1.0) accounts for the increasing physiological cost of pace maintenance over longer distances.
T2 = 25 × (42.195 / 5)^1.06 = 25 × 8.439^1.06 = 25 × 9.30 = 232.5 minutes = 3:52:30
Example — 50-minute 10K predicting half marathon:
T2 = 50 × (21.0975 / 10)^1.06 = 50 × 2.1098^1.06 = 50 × 2.188 = 109.4 minutes = 1:49:24
The exponent 1.06 (not 1.0) accounts for the increasing physiological cost of pace maintenance over longer distances.
Negative Splits — The Fastest Race Strategy
A negative split means running the second half of your race faster than the first. Research and elite race data consistently show that negative splits produce better finish times and lower perceived effort than going out too fast and fading. Most marathon world records have been run with 5–30 second negative splits.
A practical negative split strategy: run the first half at your goal pace plus 3–5 seconds per mile. Run the second half at your goal pace minus 3–5 seconds per mile. This is automatically calculated in our Splits mode above.
Training Pace Zones Based on Your Race Pace
Every training run should be run at a specific pace relative to your goal race pace. Jack Daniels’ system — the most evidence-based pace prescription in running — defines five training zones, all derived from your recent race performance:
| Zone | Pace vs Marathon Pace | Purpose | Weekly Volume |
|---|---|---|---|
| Easy (E) | +90 to +120 sec/mile | Aerobic base, recovery, fat adaptation | 70-80% of total |
| Marathon (M) | Goal marathon pace | Race simulation, metabolic efficiency | 10-15% |
| Tempo (T) | -15 to -25 sec/mile | Lactate threshold, race stamina | 10-12% |
| Interval (I) | -60 to -75 sec/mile | VO2 max, aerobic power | 5-8% |
| Repetition (R) | -90 to -100 sec/mile | Running economy, neuromuscular | 3-5% |
Average Running Pace by Age Group and Experience Level
| Level | Pace per Mile | Pace per KM | Example Race |
|---|---|---|---|
| Beginner | 12:00–14:00 | 7:27–8:42 | 5K in 37–43 min |
| Recreational | 9:00–12:00 | 5:35–7:27 | 5K in 28–37 min |
| Intermediate | 7:00–9:00 | 4:21–5:35 | 5K in 22–28 min |
| Competitive | 6:00–7:00 | 3:44–4:21 | 5K in 18–22 min |
| Elite amateur | 5:00–6:00 | 3:06–3:44 | 5K in 15–18 min |
| Elite professional | Under 5:00 | Under 3:06 | 5K in under 13:29 (WR) |
💡 Pace Conversion Quick Reference: 5:00/mile = 3:06/km = 12.0 mph. 6:00/mile = 3:44/km = 10.0 mph. 7:00/mile = 4:21/km = 8.57 mph. 8:00/mile = 4:58/km = 7.5 mph. 9:00/mile = 5:35/km = 6.67 mph. 10:00/mile = 6:12/km = 6.0 mph. 12:00/mile = 7:27/km = 5.0 mph.
Pace vs Speed — The Key Difference
Running pace and speed are inversely related. Pace is time per unit distance (min/mile or min/km). Speed is distance per unit time (mph or km/h). They give the same information but in different forms. Treadmills display speed (mph/km/h) while race training and GPS watches use pace. To convert: Speed (mph) = 60 / Pace (min/mile). Pace (min/mile) = 60 / Speed (mph).
Frequently Asked Questions
Pace = Total time / Distance. For a 5K in 25 minutes: pace = 25 / 3.107 miles = 8:03/mile, or 25 / 5 km = 5:00/km. Speed (mph) = 60 / pace (min/mile). Use the Find Pace tab above — enter your finish time and distance to get pace per mile, per km, and speed instantly with a full splits breakdown.
12:00 to 14:00 per mile (7:27 to 8:42 per km) is a good beginner pace. At this intensity you should hold a full conversation comfortably. After 2–3 months of consistent running, most beginners naturally progress to 10:00 to 12:00 per mile without consciously trying to speed up. Focus on time on feet and building the habit before worrying about pace.
A sub-2:00 half marathon requires 9:09 per mile (5:41 per km). Each of the 13.1 miles must be run in exactly 9 minutes and 9 seconds on average. With a negative split strategy: first 6.5 miles at 9:12–9:15 per mile, second 6.5 miles at 9:03–9:06 per mile. Enter “Half Marathon” + 1:59:59 in the Splits mode above for a full split schedule.
A sub-4 hour marathon requires 9:09 per mile (5:41 per km) for the full 26.2 miles. Most coaches recommend targeting 9:00 per mile (3:55:49 finish) to have a buffer. A sub-4 marathon represents approximately the top 45% of finishers at large races. Use the Splits mode above with a goal of 3:59:59 to generate your complete per-mile split schedule.
Use the Riegel formula: T2 = T1 × (D2/D1)^1.06. For a 25-minute 5K: Marathon = 25 × (42.195/5)^1.06 = 232.5 minutes = 3:52:30. Important: this assumes adequate marathon-specific training including long runs of 18-22 miles. Without this training, actual marathon time will be 10-20 minutes slower than predicted. Enter your 5K time in our Race Predictor tab above.
A negative split means running the second half of your race faster than the first. It is the most effective race strategy for distance running — most world records are set with negative splits. A practical approach: start 3–5 seconds per mile slower than goal pace for the first half, then gradually accelerate in the second half. Our Splits calculator generates a detailed negative split schedule automatically.
Pace (min/mile or min/km) and speed (mph or km/h) are inversely related but describe the same thing from different angles. Pace = 60 / Speed. Speed = 60 / Pace. A 6:00/mile pace = 10.0 mph = 16.09 km/h. Treadmills use speed; GPS watches and race programs use pace. Our calculator shows both units simultaneously so you never need to convert manually.
Training paces are derived from your goal marathon pace: Easy runs = goal pace + 90 to 120 seconds per mile. Long runs = goal pace + 60 to 90 seconds per mile. Tempo runs = goal pace minus 15 to 25 seconds per mile. Marathon pace runs = exactly goal pace. The Race Predictor and Find Pace modes above generate your training zone paces automatically based on your input.
1 mile = 1.60934 km exactly. 1 km = 0.62137 miles. Pace conversion: 6:00/mile = 3:44/km. 5:00/km = 8:03/mile. Official race distances: 5K = 3.107 miles, 10K = 6.214 miles, half marathon = 13.109 miles (21.097 km), marathon = 26.219 miles (42.195 km). Our calculator handles all conversions automatically — just select your preferred unit.
Average speeds: Recreational joggers 4–6 mph (15:00–10:00/mile). Moderate runners 6–8 mph (10:00–7:30/mile). Trained runners 8–10 mph (7:30–6:00/mile). Competitive runners 10–12 mph (6:00–5:00/mile). Elite marathoners 12–14 mph (5:00–4:18/mile). Eliud Kipchoge’s marathon world record (2:01:09 in 2023) required 13.0 mph / 4:37/mile sustained for 26.2 miles.
Recommended weekly mileage for marathon training: beginner first marathon = 30–40 miles/week at peak, sub-4 hour goal = 35–50 miles/week, sub-3:30 = 45–60 miles/week, sub-3:00 = 55–70+ miles/week. Never increase weekly mileage more than 10% per week and include a down week (reduced volume) every 3–4 weeks. Build your training program from your current fitness level rather than the goal distance.
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