Running Pace Calculator
Pace, Time and Race Predictor
Find your pace, finish time, or distance instantly. Convert min/km to min/mile. Predict your 5K, 10K, Half Marathon, and Marathon times using the Riegel formula. WhatsApp share and PDF report included.
| 5K Finish Time | Pace / km | Pace / mile | Half Marathon Est. | Marathon Est. |
|---|---|---|---|---|
| 20:00 | 4:00 | 6:26 | ~1:27:30 | ~3:03:00 |
| 25:00 | 5:00 | 8:03 | ~1:49:30 | ~3:48:00 |
| 30:00 | 6:00 | 9:39 | ~2:11:30 | ~4:34:00 |
| 35:00 | 7:00 | 11:16 | ~2:33:30 | ~5:20:00 |
| 40:00 | 8:00 | 12:52 | ~2:55:30 | ~6:06:00 |
Race time estimates use the Riegel formula. Actual results vary by individual endurance and pacing strategy.
How Running Pace Is Calculated
Understanding your running pace is the foundation of all structured training. Coaches and running programs consistently build workouts around pace targets rather than feel alone because pace provides an objective, repeatable measure that can be tracked over time. Use our Calorie Burned Calculator to see how many calories you burn at your pace, and our Heart Rate Calculator to find your optimal training heart rate zones by age.
Minutes Per Kilometer vs Minutes Per Mile
Different countries and running cultures use different pace units. The United States and United Kingdom commonly use minutes per mile, while most of the world uses minutes per kilometer. Since one mile equals exactly 1.60934 kilometers, converting between the two requires multiplying or dividing your pace by that factor. This calculator shows both units automatically. A common source of confusion: a faster runner has a lower pace number (fewer minutes per km or mile), not a higher one.
Quick Conversion Examples
5:00 min/km = 8:03 min/mile
6:00 min/km = 9:39 min/mile
7:00 min/km = 11:16 min/mile
4:30 min/km = 7:14 min/mile
Speed Equivalents
5:00 min/km = 12.0 km/h
6:00 min/km = 10.0 km/h
7:00 min/km = 8.6 km/h
4:00 min/km = 15.0 km/h
The Riegel Race Time Predictor Formula
The race time predictor on this page uses the Riegel formula, developed by exercise physiologist Peter Riegel in 1977: T2 = T1 x (D2 / D1)^1.06, where T1 and D1 are your known time and distance, and T2 is your predicted time for a new distance D2. The exponent of 1.06 reflects the fact that pace naturally slows as distance increases due to accumulating fatigue, fueling demands, and endurance limitations.
The Riegel formula is most accurate when predicting between similar distances -- for example, using a 10K result to predict a half marathon. It becomes less reliable for very large jumps, such as predicting a marathon from a 5K, because marathon performance depends heavily on specific endurance adaptations (long runs, fueling practice, fat adaptation) that a short fast race does not fully capture. Use it alongside our VO2 Max Calculator for a more complete picture of your aerobic fitness.
Pace Zones and Training Explained
Most structured running programs build workouts around specific pace zones, since different training paces develop different physiological adaptations:
- Easy / Recovery pace: A comfortable, fully conversational effort, typically 1-2 minutes per km slower than race pace. This should form 70-80% of most runners' weekly training volume. Easy running builds aerobic base and allows recovery between hard sessions
- Tempo pace: A comfortably hard, sustained effort -- approximately the pace you could hold for about 60 minutes in a race. Used to build lactate threshold and race-specific endurance. Typically 20-30 second faster per km than marathon pace
- Interval / VO2 Max pace: Faster than current race pace, run in short repeated efforts (400m-1600m) with recovery between. Builds aerobic capacity (VO2 max) and neuromuscular efficiency. Check your VO2 Max to understand your current aerobic ceiling
- Race pace: The specific pace targeted for an upcoming event. Practiced in training at controlled doses to build familiarity and confidence in the feeling of race effort
How to Run Faster -- Evidence-Based Tips
- Increase weekly volume gradually: More easy running is the single most reliable way to improve running fitness over time. Follow the 10% rule -- increase weekly mileage by no more than 10% per week to reduce injury risk
- Add one interval session per week: Short, fast repeats at 5K pace or faster build speed and aerobic capacity. Try 6-8 x 400m with equal recovery. Track your effort using our Heart Rate Calculator
- Add one tempo run per week: 20-40 minutes at comfortably hard pace builds the lactate threshold that determines how fast you can sustain a pace for longer distances
- Prioritize your long run: A weekly long run builds the aerobic base and fat adaptation critical for distances beyond 10K. For half marathon and marathon training, this is non-negotiable
- Fuel and hydrate properly: Carbohydrates fuel running performance, especially above 60-75 minutes. Check your daily water intake needs and daily calorie requirements to support your training load
- Add strength training 2x per week: Stronger glutes, hamstrings, and core directly improve running economy. Our One Rep Max Calculator can help structure your lifting
- Monitor recovery: Check your Recovery Heart Rate after hard workouts as an indicator of how well your body is adapting to training load. A slower recovery may signal the need for more rest
- Track your sleep: Sleep is when adaptation happens. Use our Sleep Calculator to optimize your sleep timing around training days
Common Race Pace Targets Explained
5K Pace
The 5K is the ideal race for most beginner runners and a key speed benchmark for advanced runners. A 30-minute 5K requires a 6:00 min/km pace. Breaking 25 minutes requires 5:00 min/km. Elite club runners target sub-20 minutes (4:00 min/km). The 5K heavily stresses the VO2 max system, making it a strong indicator of aerobic fitness.
10K Pace
The 10K typically runs at 5-10% slower pace than a 5K due to the longer duration. A runner who does 25 minutes for 5K can typically predict approximately 51-52 minutes for 10K. The Riegel formula built into this calculator handles this conversion automatically.
Half Marathon Pace
A 2-hour half marathon (sub-2) requires an average pace of 5:41 min/km (9:09 min/mile). This is a popular first goal for runners who have been training for 3-6 months. Sub-2 requires consistent weekly training of 30-50 km per week including a long run of 16-19 km.
Marathon Pace
Marathon pace is typically 45 seconds to 1 minute 30 seconds per km slower than half marathon pace, due to the dramatically greater fueling and endurance demands. Pacing discipline is critical -- starting even 30 seconds per km too fast in the first half leads to significant slowdown in the final 10-15 km. Use the Riegel predictor above as a starting estimate only. Monitor your heart rate zones during marathon training to avoid overtraining.
