Running Pace Calculator
Enter your pace to get a predicted finish time, or enter your finish time to find your required pace. Works for 5K, 10K, half marathon, marathon, and custom distances.
Finish Time
30:00
Pace /km
6:00
Pace /mile
9:39
Speed
10.0 km/h
6.2 mph
How to Use
Select a distance (5K, 10K, half marathon, marathon, or custom). Then choose your mode: enter a pace to predict your finish time, or enter a goal finish time to find the required pace. The calculator shows pace per km, pace per mile, and your equivalent speed in km/h and mph.
Common Race Benchmark Paces
| Goal | 5K | 10K | Half | Marathon |
|---|---|---|---|---|
| Sub-20 | 19:55 | 39:50 | 1:24:00 | 2:47:50 |
| Sub-25 | 24:55 | 49:50 | 1:45:00 | 3:30:00 |
| Sub-30 | 29:55 | 59:50 | 2:06:00 | 4:12:00 |
| Sub-60 (10K) | 29:55 | 59:50 | 2:06:00 | 4:12:00 |
Why Use This Calculator
Runners at every level — from beginners preparing for their first 5K to marathon veterans chasing a PR — need accurate pace calculations for training and race planning. This calculator instantly converts between pace, speed, and finish time, eliminating mental math during training. Coaches use it to set interval targets for athletes. Race planners use it to create pacing strategies that prevent going out too fast. It also helps you compare performances across different distances and set realistic goals based on your current fitness level.
Real-World Examples
Example 1: First 5K Goal
A beginner runner wants to finish a 5K in under 30 minutes. That requires a pace of 6:00/km (9:39/mile) or faster, which equals a speed of 10 km/h (6.2 mph). During training, they should practice running at 5:50-5:55/km pace to have a small cushion for race-day conditions.
Example 2: Sub-2-Hour Half Marathon
To break 2 hours in a half marathon (21.1 km), you need a pace of 5:41/km (9:09/mile). This is a common goal for intermediate runners. Your 10K time should be around 52-55 minutes to realistically attempt this. Plan for even pacing or a slight negative split for the best results.
Example 3: Marathon Pacing Strategy
A runner aiming for a 4-hour marathon needs to maintain 5:41/km (9:09/mile) for 42.195 km. Starting 10-15 seconds per km slower than target pace for the first 5 km helps conserve energy. Many successful marathoners run the second half faster than the first — a negative split strategy that prevents hitting the wall.
Tips & Things to Watch Out For
- •Your easy training pace should be 60-90 seconds per km slower than your race pace — most runners train too fast on easy days.
- •Heat adds roughly 1-3% to your pace per 5°F above 60°F — adjust your target pace on hot race days to avoid blowing up late in the race.
- •GPS watches often measure long on curvy courses — your actual distance may be 1-3% less than displayed, making your true pace slightly faster.
- •For hilly courses, plan to lose 10-15 seconds per km on uphills and gain 5-10 seconds on downhills compared to your flat-ground pace.
- •Race day adrenaline makes the first kilometer feel easy — stick to your planned pace early to avoid burning out in the second half.
Frequently Asked Questions
- What is a good running pace for beginners?
- For most beginners, a comfortable jogging pace is 10-12 minutes per mile (6:12-7:27 per km). This lets you hold a conversation while running, which is the right intensity for building aerobic base. As fitness improves, many runners progress to 8-10 min/mile. Elite marathon runners maintain 4:30-5:00 min/mile pace.
- How do I calculate my target pace for a race?
- Decide on your goal finish time, then divide by the distance. For example, a 30-minute 5K goal means 30 ÷ 5 = 6 minutes per km pace (9:39 per mile). Enter those numbers in this calculator to confirm. Add 10-15 seconds per km buffer for hills, heat, or course variation.
- What is the difference between pace and speed?
- Pace is how long it takes to cover one unit of distance (e.g., 6:00/km means 6 minutes per kilometer). Speed is distance covered per unit of time (e.g., 10 km/h). They're reciprocals of each other — a 6:00/km pace equals exactly 10 km/h. Runners typically use pace; cyclists and many sports apps use speed.
- How accurate is this pace calculator?
- This calculator provides exact mathematical conversions between pace, time, and distance. Real-world race times may vary due to hills, weather, fatigue, and course accuracy. GPS watches typically measure distance within 1-3% accuracy, which can affect calculated pace by a similar margin.
- How do I convert between pace per km and pace per mile?
- Multiply your km pace by 1.60934 to get mile pace. For example, 5:00/km equals 8:03/mile. Alternatively, divide your mile pace by 1.60934 to get km pace. This calculator handles the conversion automatically so you can see both units instantly.
- Why is my race pace slower than my training pace?
- Race distance plays a major role. You can sustain a faster pace for shorter distances. A common guideline is that your half marathon pace is about 15-20 seconds per km slower than your 10K pace, and your marathon pace is 15-30 seconds slower than your half marathon pace. Heat, hills, and race-day nerves also affect performance.