Running tempo — more commonly called pace — is calculated by dividing your total run time by the distance covered:
Pace = Total Time ÷ Distance
The result is expressed as minutes per kilometer (min/km) or minutes per mile (min/mi). To convert between the two: min/mile = min/km × 1.60934.
Example: You run 10 km in 52 minutes and 30 seconds (52.5 minutes total). Pace = 52.5 ÷ 10 = 5:15 per km. To convert: 5.25 × 1.60934 = 8:27 per mile. To find speed: 60 ÷ 5.25 = 11.43 km/h.
To calculate finish time from a target pace: Time = Pace × Distance. If you want to run a half marathon (21.1 km) at 5:30/km pace: 5.5 × 21.1 = 116.05 minutes = 1:56:03.
The term "tempo" in running has a specific meaning beyond just pace. A tempo run is a sustained effort at your lactate threshold pace — roughly the fastest pace you could hold for about one hour in a race. This is typically 80–90% of your maximum heart rate. Regular tempo training raises your lactate threshold, enabling you to run faster at a comfortable effort level.
Different training paces target different physiological adaptations. Understanding these zones is essential for structured training:
| Zone | Effort Description | % Max HR | Approximate Pace | Purpose |
|---|---|---|---|---|
| Zone 1: Recovery | Very easy, walk/jog | 55–65% | 7:00–8:00+ min/km | Active recovery between hard sessions |
| Zone 2: Easy Aerobic | Comfortable, conversational | 65–75% | 5:45–7:00 min/km | Build aerobic base, fat oxidation |
| Zone 3: Tempo | Comfortably hard | 80–88% | 4:45–5:30 min/km | Raise lactate threshold |
| Zone 4: Threshold | Hard, sustainable 60 min | 88–92% | 4:20–4:45 min/km | Race-pace fitness, VO2max support |
| Zone 5: VO2max | Very hard, 3–8 min efforts | 95–100% | 3:50–4:20 min/km | Increase maximum oxygen uptake |
Paces shown are illustrative for a runner with a 5K time around 22–24 minutes. Adjust proportionally to your own fitness level.
The 80/20 rule of training suggests spending 80% of weekly volume in Zones 1–2 (easy) and only 20% in Zones 3–5 (hard). Research by Stephen Seiler confirms that this polarized approach produces superior results compared to moderate-intensity training for most endurance athletes.
Goal: Break 25 minutes in a 5K race.
Goal: Run a 3:45 marathon (3 hours 45 minutes).
A treadmill displays speed as 11.0 km/h. What's the equivalent outdoor pace?
| Factor | Easy Run | Tempo Run | Interval Session |
|---|---|---|---|
| Effort | Conversational | Comfortably hard | Hard to very hard |
| Heart rate | 60–75% max | 80–90% max | 90–100% max |
| Pace (relative to 5K) | +60–90 sec/km | +25–30 sec/km | 0 to −10 sec/km |
| Duration | 30–90+ minutes | 20–40 minutes sustained | 3–5 min reps with rest |
| Weekly frequency | 4–5 sessions | 1–2 sessions | 1–2 sessions |
| Primary benefit | Aerobic base, recovery | Lactate threshold | VO2max, speed |
| Can you talk? | Full conversation | Short phrases only | Single words at most |
A balanced training week for a runner doing 5 sessions might look like: 3 easy runs, 1 tempo run, and 1 interval session. The easy runs should truly be easy — most recreational runners run their easy days 30–45 seconds per km too fast, which Jack Daniels called "the most common training error in running." Use a heart rate calculator to define your personal zones, and the training zone calculator for zone-based training guidance.
For beginners, focus on easy pace rather than tempo pace. A comfortable easy pace is typically 7:00–9:00 min/km (11:00–14:30 min/mile). Run by effort — if you can hold a conversation, your pace is right. After 3–6 months of base building, introduce tempo runs at a pace where you can speak in short phrases but not hold a full conversation.
Your tempo pace is approximately your 10K race pace, or 25–30 sec/km slower than your 5K race pace. You can also use heart rate: tempo = 80–90% of max HR. During a tempo run, you should speak in short phrases but not hold a conversation. If you can recite a full sentence comfortably, speed up. If you can barely talk, slow down.
20–40 minutes of sustained effort for most runners. Beginners: 2–3 × 10-minute segments with 2 min easy between. Intermediate: 20–30 min continuous. Advanced: 40–60 min continuous. Include a warm-up (10–15 min easy) and cool-down (10 min easy). Aim for 1–2 tempo sessions per week.
Pace measures time per distance (min/km or min/mi). Speed measures distance per time (km/h or mph). They are reciprocals: Speed (km/h) = 60 ÷ Pace (min/km). Runners use pace because it directly maps to split times; cyclists and other sports use speed. Both describe the same thing from different perspectives.
Heat significantly slows running. At 25°C (77°F), expect pace to slow 3–5%. At 30°C (86°F), 5–8% slower. At 35°C (95°F), 10–15% slower. Humidity amplifies the effect. In cold weather (below 5°C), pace may actually improve slightly if you're dressed well, though extreme cold requires longer warm-ups.
Both have value. Pace is objective and useful for race planning and track workouts. Heart rate reflects internal effort and adjusts for heat, fatigue, and terrain automatically. Ideal approach: use pace for quality sessions (tempo, intervals) and heart rate for easy runs (to prevent going too fast). Use both together for the most complete picture.
As a rough guide, each 100m of elevation gain adds 30–45 seconds to your pace per kilometer on the climb. Descending recovers some but not all of that time (roughly 15–20 seconds per 100m of descent). A hilly 10K with 200m total climb might take 3–5 minutes longer than a flat 10K at equivalent effort.
The talk test is a simple way to gauge intensity without technology. Easy pace: full conversation. Tempo pace: short phrases (5–6 words). Threshold pace: one or two words between breaths. VO2max pace: can't talk. Research validates the talk test as a reliable proxy for ventilatory thresholds in trained and untrained runners alike.
Elite marathoners run at 2:50–3:00/km for 42.195 km — faster than most people can sprint 400m. This requires a VO2max of 75–85+ mL/kg/min, years of progressive training averaging 160–220 km/week, exceptional running economy (low energy cost per stride), and optimal body composition. Genetics play a significant role, but training consistency is the primary differentiator among elite athletes.