The Quick Answer
Running pace is the time it takes to run one unit of distance. To calculate it:
Pace = Total Time ÷ Distance
If you ran 10 km in 55 minutes, your pace is 55 ÷ 10 = 5:30 min/km (which equals 8:51 min/mile or 10.9 km/h).
A faster pace means a lower number — 4:30/km is faster than 6:00/km. This is the opposite of speed, where a higher number is faster.
Use a pace calculator to compute any combination of pace, time, and distance instantly.
What Is Running Pace?
Pace is the standard way runners measure effort and plan races. It answers a simple question: "How long does it take me to cover one kilometer (or one mile)?"
Pace is expressed as minutes:seconds per unit of distance:
- 5:30 min/km — five minutes and thirty seconds to run one kilometer
- 8:51 min/mi — eight minutes and fifty-one seconds to run one mile
Runners prefer pace over speed because it's directly actionable. During a run, you check your split time for the last kilometer and instantly know whether you're on target. Speed (in km/h) requires mental math to translate into how your race is going.
The Three Pace Formulas
Every running calculation uses one of three rearrangements of the same relationship:
1. Find Pace (from distance and time)
Pace = Time ÷ Distance
Example: You ran a 5K in 27:30.
- 27 minutes 30 seconds = 27.5 minutes
- 27.5 ÷ 5 = 5.5 minutes per km = 5:30 min/km
2. Find Time (from distance and pace)
Time = Pace × Distance
Example: What's your marathon finish time at 5:30/km pace?
- 5.5 min/km × 42.195 km = 232.07 minutes = 3:52:04
3. Find Distance (from time and pace)
Distance = Time ÷ Pace
Example: How far can you run in 45 minutes at 6:00/km pace?
- 45 ÷ 6 = 7.5 km (4.66 miles)
How to Convert Between min/km and min/mile
Since 1 mile = 1.60934 km, the conversions are:
- min/km → min/mile: Multiply by 1.60934
- min/mile → min/km: Divide by 1.60934
Worked Example
Convert 5:00 min/km to min/mile:
- 5:00 = 5.0 minutes
- 5.0 × 1.60934 = 8.047 minutes
- 0.047 × 60 = 2.8 seconds ≈ 3 seconds
- Result: 8:03 min/mile
Convert 9:00 min/mile to min/km:
- 9:00 = 9.0 minutes
- 9.0 ÷ 1.60934 = 5.59 minutes
- 0.59 × 60 = 35 seconds
- Result: 5:35 min/km
Quick Reference Table
| min/km | min/mile | km/h | mph |
|---|---|---|---|
| 3:30 | 5:38 | 17.1 | 10.6 |
| 4:00 | 6:26 | 15.0 | 9.3 |
| 4:30 | 7:15 | 13.3 | 8.3 |
| 5:00 | 8:03 | 12.0 | 7.5 |
| 5:30 | 8:51 | 10.9 | 6.8 |
| 6:00 | 9:39 | 10.0 | 6.2 |
| 6:30 | 10:28 | 9.2 | 5.7 |
| 7:00 | 11:16 | 8.6 | 5.3 |
| 7:30 | 12:04 | 8.0 | 5.0 |
| 8:00 | 12:53 | 7.5 | 4.7 |
| 9:00 | 14:29 | 6.7 | 4.1 |
| 10:00 | 16:06 | 6.0 | 3.7 |
How to Convert Pace to Speed (and Back)
Pace and speed are inverses:
- Pace (min/km) → Speed (km/h): Speed = 60 ÷ Pace
- Speed (km/h) → Pace (min/km): Pace = 60 ÷ Speed
Example: 5:00 min/km → 60 ÷ 5 = 12.0 km/h Example: 10 km/h → 60 ÷ 10 = 6:00 min/km
For miles:
- Pace (min/mi) → Speed (mph): Speed = 60 ÷ Pace
- 8:00 min/mile → 60 ÷ 8 = 7.5 mph
Race Pace Targets
One of the most common reasons to calculate pace is to figure out what pace you need for a race time goal. Here are the most popular targets:
5K Targets
| Goal Time | Required Pace (min/km) | Required Pace (min/mi) |
|---|---|---|
| 20:00 | 4:00 | 6:26 |
| 22:00 | 4:24 | 7:05 |
| 25:00 | 5:00 | 8:03 |
| 27:30 | 5:30 | 8:51 |
| 30:00 | 6:00 | 9:39 |
| 35:00 | 7:00 | 11:16 |
10K Targets
| Goal Time | Required Pace (min/km) | Required Pace (min/mi) |
|---|---|---|
| 40:00 | 4:00 | 6:26 |
| 45:00 | 4:30 | 7:15 |
| 50:00 | 5:00 | 8:03 |
| 55:00 | 5:30 | 8:51 |
| 60:00 | 6:00 | 9:39 |
| 70:00 | 7:00 | 11:16 |
Half Marathon Targets (21.0975 km)
| Goal Time | Required Pace (min/km) | Required Pace (min/mi) |
|---|---|---|
| 1:30:00 | 4:16 | 6:52 |
| 1:45:00 | 4:58 | 8:00 |
| 2:00:00 | 5:41 | 9:09 |
| 2:15:00 | 6:24 | 10:18 |
| 2:30:00 | 7:06 | 11:27 |
Marathon Targets (42.195 km)
| Goal Time | Required Pace (min/km) | Required Pace (min/mi) |
|---|---|---|
| 3:00:00 | 4:16 | 6:52 |
| 3:30:00 | 4:58 | 8:00 |
| 4:00:00 | 5:41 | 9:09 |
| 4:30:00 | 6:24 | 10:18 |
| 5:00:00 | 7:06 | 11:27 |
| 5:30:00 | 7:49 | 12:35 |
These times assume a constant pace, which is nearly impossible in practice. Build in a buffer of 5–10 seconds per km below your goal pace to account for slowing in the final kilometers.
Pacing Strategy: How to Run a Smarter Race
Knowing your target pace is only half the equation. How you distribute that pace across the race matters as much as the average number.
Even Pacing
Running every kilometer at approximately the same pace. This is the most energy-efficient strategy for most distances and fitness levels. It avoids the metabolic cost of going fast early and recovering later.
Best for: 5K, 10K, and experienced half-marathon runners.
Negative Splitting
Running the second half faster than the first. A slight negative split — starting 5–10 seconds per km slower than target and accelerating in the second half — reduces early fatigue and often produces a faster overall time.
Best for: Half marathons and marathons. Many marathon course records have been set with negative or even splits.
Example: A 4:00 marathon (5:41/km average) with a negative split might look like:
- First half: 2:01:30 (5:45/km pace)
- Second half: 1:58:30 (5:37/km pace)
Positive Splitting (and Why It Usually Isn't Intentional)
Running the first half faster and slowing down. This is the most common pattern in recreational races, but it's rarely planned. It happens when runners start too fast on adrenaline and fade as glycogen depletes and fatigue accumulates.
The fix: Discipline in the first 2–3 km. If your target is 5:30/km, force yourself to run 5:35–5:40 for the first two kilometers. It will feel easy — that's the point.
What Affects Your Running Pace
Pace is not a fixed number. The same runner can vary by 30–60 seconds per km depending on conditions:
Elevation. Uphill running slows pace by roughly 15–20 seconds per km for each 1% of average grade. Downhill can recover some time but doesn't fully offset the climb, especially on steep descents that stress quadriceps.
Heat and humidity. Performance declines measurably above 15°C (59°F). At 25°C (77°F), expect pace to slow by 10–20 seconds per km compared to cool conditions. High humidity compounds the effect by reducing the body's ability to cool through evaporation.
Wind. A headwind of 15–20 km/h can slow pace by 10–15 seconds per km. Tailwinds help less than headwinds hurt — the relationship is asymmetric because air resistance increases with the square of relative speed.
Terrain. Trail running is typically 15–30% slower than road running at the same effort level, due to uneven footing, obstacles, and elevation changes.
Fatigue and training state. Fresh legs early in a training cycle produce faster paces at the same perceived effort. Cumulative fatigue from high-mileage weeks increases pace at a given heart rate.
Altitude. Running above 1,500 meters (5,000 feet) reduces oxygen availability. Most runners notice a pace increase of 3–8% at moderate altitude (1,500–2,500 m). Full acclimatization takes 2–3 weeks.
Pace Zones for Training
Training plans use pace zones to target different energy systems. While specific zones depend on individual fitness (usually anchored to a recent race time or lactate threshold test), a common framework is:
Easy / Recovery pace: 60–90 seconds per km slower than race 5K pace. Feels conversational. Builds aerobic base without significant fatigue. Most training volume should be here.
Tempo / Threshold pace: Approximately 15K–half marathon race pace. "Comfortably hard" — you can speak in short phrases but not full sentences. Improves lactate clearance.
Interval pace: Approximately 3K–5K race pace. Hard effort maintained for 2–5 minute repetitions with rest between. Improves VO2max and running economy.
Repetition pace: Faster than 5K pace. Short bursts (200m–400m) focused on neuromuscular speed and form. Full recovery between reps.
Example for a runner with a 25:00 5K (5:00/km race pace):
- Easy: 6:00–6:30 min/km
- Tempo: 5:10–5:20 min/km
- Interval: 4:40–5:00 min/km
- Repetition: 4:15–4:30 min/km
Common Mistakes When Calculating or Using Pace
Mixing up km and miles
A 5:00/km pace and a 5:00/mile pace are dramatically different. 5:00/km = 12 km/h — a solid recreational pace. 5:00/mile = 19.3 km/h — that's competitive-level racing. Always check the unit label.
Assuming race pace equals training pace
Your 5K race pace is an all-out effort for ~25 minutes. You cannot sustain it for a marathon. A common guideline: marathon pace is roughly 45–75 seconds per km slower than 5K race pace, depending on fitness.
Using pace from a short run to predict a long race
Running 5 km at 5:00/km does not mean you can run a marathon at 5:00/km. Pace slows with distance due to glycogen depletion, muscle fatigue, and thermal regulation. The slowdown depends on training, but 10–20% is common from 5K to marathon.
Not accounting for the warm-up effect
The first 1–2 km of any run are typically slower as the body transitions from rest to running. Many runners panic when their first split is "slow" and speed up too early. If you're running by feel, expect the first kilometer to be 10–20 seconds slower than your target; the pace settles naturally.
Ignoring course profile
A "5:30/km pace for a sub-4 marathon" target only works on a flat course. If the marathon has significant hills, you need a faster average on the flat and downhill sections to compensate for the slower uphill sections.
Treadmill Speed to Outdoor Pace
Treadmills display speed (km/h or mph) rather than pace. Here's how to convert:
| Treadmill (km/h) | Pace (min/km) | Pace (min/mi) |
|---|---|---|
| 8.0 | 7:30 | 12:04 |
| 9.0 | 6:40 | 10:44 |
| 10.0 | 6:00 | 9:39 |
| 10.5 | 5:43 | 9:12 |
| 11.0 | 5:27 | 8:47 |
| 12.0 | 5:00 | 8:03 |
| 13.0 | 4:37 | 7:25 |
| 14.0 | 4:17 | 6:54 |
| 15.0 | 4:00 | 6:26 |
| 16.0 | 3:45 | 6:02 |
Note: Treadmill running is slightly easier than outdoor running at the same pace because there's no air resistance and the belt assists leg turnover. Setting a 1% incline on the treadmill roughly compensates for this difference, based on research by Jones and Doust (1996).
Frequently Asked Questions
What is running pace?
Running pace is the time it takes to cover one unit of distance — typically expressed as minutes per kilometer (min/km) or minutes per mile (min/mi). A 5:30/km pace means one kilometer every 5 minutes and 30 seconds. Lower numbers mean faster running.
How do I calculate my running pace?
Divide total time by distance. If you ran 10 km in 52:30 (52.5 minutes), your pace is 52.5 ÷ 10 = 5.25 minutes = 5:15 min/km. Use a pace calculator for instant results with any distance and time.
How do I convert min/km to min/mile?
Multiply the min/km value by 1.60934. For example, 5:00/km × 1.60934 = 8:03/mile. To go from min/mile to min/km, divide by 1.60934.
How do I convert pace to speed?
Divide 60 by the pace in minutes. 5:00 min/km = 60 ÷ 5 = 12 km/h. 8:00 min/mile = 60 ÷ 8 = 7.5 mph.
What is a good 5K pace for beginners?
Most beginners finish their first 5K between 30 and 40 minutes, which is a pace of 6:00–8:00 min/km (9:39–12:53 min/mi). A "good" pace is one that's sustainable and comfortable for your current fitness level. Improvement comes with consistent training over weeks and months.
What pace for a sub-4-hour marathon?
You need a pace faster than 5:41 min/km (9:09 min/mi) over 42.195 km. Targeting 5:35/km gives a small buffer. In practice, plan for even or slight negative splits.
What pace for a sub-2-hour half marathon?
Same pace threshold: faster than 5:41 min/km (9:09 min/mi) over 21.0975 km.
What is negative splitting in running?
Running the second half of a race faster than the first half. It's considered the most efficient strategy for distance races because it avoids the metabolic cost of starting too fast.
Why am I slower on hills?
Uphill running requires more energy per stride due to the work of lifting your body against gravity. A 1% grade typically adds 15–20 seconds per km at a given effort. Downhill running can partially compensate, but steep descents stress the quadriceps and don't fully recover the time lost.
Is treadmill pace the same as outdoor pace?
Not exactly. Treadmills eliminate air resistance and the belt assists leg turnover, making the same pace feel easier. Setting a 1% incline on the treadmill roughly compensates for this difference. GPS watches may also read slightly differently than treadmill displays.
What is the difference between pace and speed?
Pace is time per distance (5:30 min/km). Speed is distance per time (10.9 km/h). They are mathematical inverses. Runners use pace; cyclists and drivers use speed. The practical difference is how easily each translates into race planning.
How much slower is marathon pace than 5K pace?
It varies by runner, but typically 45–75 seconds per km. A runner with a 5:00/km 5K pace might run a marathon at 5:45–6:15/km. The gap depends on endurance training, running economy, and race experience.
How do heat and humidity affect pace?
Heat above 15°C (59°F) progressively slows pace at a given effort. At 25°C (77°F), expect 10–20 seconds per km slower. Humidity above 60% compounds the effect. For hot-weather races, adjust your target pace or rely on perceived effort rather than a fixed number.
Should I run by pace or heart rate?
Both have uses. Pace is useful for race planning and flat-course training. Heart rate is more useful for hilly runs, variable conditions, and ensuring easy days are truly easy. Many training plans combine both: pace-based workouts with heart-rate caps on recovery runs.
How do I find my goal race pace?
Start with a recent race result. If you ran a 5K in 25:00, tools like the pace calculator can compute your pace (5:00/km), and equivalent race time predictors can estimate longer-distance targets. Another approach: run a time trial over a shorter distance and extrapolate using established formulas (like the Riegel formula).
Related Tools
- Pace Calculator — calculate pace, finish time, or distance for any running scenario
- Calories Burned Calculator — estimate energy expenditure during a run
- Steps to Miles Converter — convert step count to distance
- BMI Calculator — check body mass index
- Countdown Timer — time your intervals and rest periods