Pace Calculator
Calculate pace from distance and time, finish time from distance and pace, or distance from time and pace. Works in km and miles.
| Race | Distance (km) | Finish Time |
|---|---|---|
| 5K | 5.00 | 25:00 |
| 10K | 10.00 | 50:00 |
| Half Marathon | 21.10 | 1:45:29 |
| Marathon | 42.20 | 3:30:59 |
For informational purposes only. Consult a healthcare professional before beginning a new exercise program.
For informational purposes only. Consult a healthcare professional before beginning a new exercise program.
How the Pace Calculator Works
Running pace, time, and distance are linked by a simple relationship:
Time = Distance × Pace
Pace = Time ÷ Distance
Distance = Time ÷ Pace
Given any two of the three values, you can calculate the third. This calculator offers all three modes:
- Find Pace: Enter total distance and finish time to calculate your average pace per km or mile.
- Find Time: Enter distance and target pace to calculate your projected finish time.
- Find Distance: Enter total time and pace to calculate how far you will run.
Common Race Distances and Target Paces
| Race | Distance | 1-hour finish pace | Sub-2h finish pace | Sub-4h finish pace |
|---|---|---|---|---|
| 5K | 5.0 km | 12:00 min/km | — | — |
| 10K | 10.0 km | 6:00 min/km | — | — |
| Half Marathon | 21.1 km | — | 5:41 min/km | — |
| Marathon | 42.2 km | — | — | 5:41 min/km |
Pace Conversion Table
| min/km | min/mile | km/h | mph |
|---|---|---|---|
| 4:00 | 6:26 | 15.0 | 9.3 |
| 4:30 | 7:14 | 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 |
| 8:00 | 12:52 | 7.5 | 4.7 |
| 10:00 | 16:06 | 6.0 | 3.7 |
Training Pace Zones
Most running coaches use a zone system based on a runner's lactate threshold or maximum heart rate. The most common framework divides training into five intensity zones:
| Zone | Name | Intensity | Purpose |
|---|---|---|---|
| Z1 | Recovery | Very easy, conversational | Active recovery between hard sessions |
| Z2 | Aerobic base | Easy, able to speak full sentences | Build aerobic capacity (most of your training) |
| Z3 | Tempo | Comfortably hard, short sentences | Improve lactate clearance |
| Z4 | Threshold | Hard, 1–2 words at a time | Raise lactate threshold |
| Z5 | VO2max | Very hard, unsustainable for >6–8 min | Improve maximal aerobic capacity |
The 80/20 principle (polarized training) suggests spending approximately 80% of total training time in Zones 1–2 and 20% in Zones 3–5. This ratio has strong research support across endurance sports. Going too hard on easy days ("junk miles") is one of the most common mistakes amateur runners make — it impairs recovery without providing additional aerobic benefit.
Pacing Strategies for Race Day
How you distribute your effort over a race significantly affects your performance:
- Even splits: Running each kilometre or mile at the same pace. Requires good pacing discipline but conserves glycogen efficiently.
- Negative splits: Running the second half faster than the first. This is how most world records are set. Starting conservatively prevents the dreaded "wall" in marathons.
- Positive splits: Going out fast and slowing down in the second half. What most amateur runners accidentally do. Leads to excessive fatigue and finishing time much slower than predicted.
For most amateur runners, aiming for even or slightly negative splits is the most effective race strategy. Use this calculator to find your target pace, then subtract 5–10 seconds per kilometre for your first-half pace and add 5–10 seconds for your target second-half pace.
Frequently Asked Questions
What is running pace and how is it measured?
Running pace is the time it takes to cover one unit of distance — typically expressed as minutes per kilometre (min/km) or minutes per mile (min/mi). A pace of 5:00 min/km means you run one kilometre every five minutes. Pace is the inverse of speed: a pace of 5:00 min/km equals a speed of 12 km/h (60 minutes ÷ 5 min/km). Runners typically track pace rather than speed because it is directly actionable — you can feel when you are running at a target pace, whereas km/h requires a GPS watch to monitor accurately.
What is a good running pace for a beginner?
A comfortable beginner jogging pace is typically 7:00–8:30 min/km (11:15–13:40 min/mile), which corresponds to a conversational pace where you can speak in short sentences without gasping. Most running programs for beginners (Couch to 5K, etc.) do not specify a pace — instead, they suggest running at a "comfortable" effort where you can maintain a conversation. Over time, as your cardiovascular fitness improves, your comfortable pace will naturally become faster without any additional effort. Focus on duration and consistency in the early stages, not speed.
How do I convert between min/km and min/mile?
One mile = 1.60934 km. To convert min/km to min/mile, multiply the pace by 1.60934. For example, a pace of 5:00 min/km × 1.60934 = 8:03 min/mile. To convert min/mile to min/km, divide by 1.60934. For example, 8:00 min/mile ÷ 1.60934 = 4:58 min/km. This calculator performs the conversion automatically and shows both values for every result.
What pace do I need to run a sub-4-hour marathon?
A sub-4-hour marathon (42.195 km) requires running at a pace faster than 5:41 min/km (9:09 min/mile). To give yourself a buffer for slower spots, aim for 5:30–5:35 min/km average (8:52–8:59 min/mile). A 3:30 marathon requires 4:58 min/km (8:00 min/mile). A 3-hour marathon — a significant achievement for amateur runners — requires 4:15 min/km (6:50 min/mile). Use this calculator's race splits table to see finish times at any pace you enter.
What are running pace zones and how do I use them?
Pace zones correspond to intensity levels, typically defined relative to your lactate threshold pace (the pace you can sustain for roughly 60 minutes at maximum effort). Zone 1 (recovery): 2+ min/km slower than threshold. Zone 2 (aerobic base): 1–2 min/km slower than threshold. Zone 3 (tempo): 0–30 sec/km slower than threshold. Zone 4 (threshold): your lactate threshold pace. Zone 5 (VO2max): faster than threshold for short intervals. Most training plans recommend spending 80% of training volume in Zones 1–2 (easy aerobic) and 20% in Zones 3–5 (hard work) — the polarized or 80/20 approach.
Related Calculators
- Heart Rate Zone Calculator — Karvonen formula, 5-zone training system
- Calorie Calculator — Daily calorie needs based on activity level
- BMI Calculator — Body Mass Index with WHO categories