Calculate your running pace in minutes per kilometre, your speed in km/h and mph, and predicted finish times for popular race distances — 5K, 10K, half marathon and marathon. Enter the distance and time from any of your runs.
Pace is expressed in minutes per kilometre (min/km) and tells you how long it takes to run one kilometre. Speed is the inverse and is expressed in kilometres per hour (km/h). A pace of 5:00/km is equivalent to a speed of 12 km/h.
Enter your time in mm:ss format for runs under an hour (e.g. 55:00 for 55 minutes) or hh:mm:ss format for longer runs (e.g. 1:45:30 for 1 hour 45 minutes 30 seconds).
Improving pace requires progressive training without overuse injuries that derail progress. Follow the 10% rule: increase weekly mileage by no more than 10% to allow adaptation while minimizing injury risk. Include variety: 80% of runs should be easy conversational pace building aerobic base, 20% harder efforts (intervals, tempo, hills) improving speed and lactate threshold. Tempo runs at comfortably hard pace for 20-40 minutes teach your body to sustain faster speeds. Interval sessions like 8×400m at faster-than-race pace with recovery jogs improve VO2 max and speed. Hill repeats build leg strength and power. Long slow runs extend endurance allowing you to maintain pace over distance. Don't neglect easy days — recovery runs at genuinely easy pace (you should be able to hold a conversation) allow adaptation and prevent burnout. Strength training 2-3 times weekly builds resilient muscles, tendons, and bones reducing injury while improving running economy. Core work improves posture and efficiency. Quality sleep and nutrition support recovery and adaptation — training tears muscles down; rest builds them stronger. Be patient: beginners gain pace quickly for 6-12 months then progress slows requiring smarter training. Experienced runners might chase seconds per kilometer over months. Track progress through races or time trials rather than daily training pace which fluctuates with weather, fatigue, and terrain. Consider that running faster primarily results from running more (building aerobic capacity through volume) rather than constantly running hard — counterintuitively, more easy miles makes you faster than relentless hard efforts that lead to overtraining.
First-time race pacing is notoriously difficult as you lack experience judging sustainable effort over the distance. A common formula: run half marathons ~30 seconds per km slower than 10K pace, and marathons ~60-75 seconds per km slower than half marathon pace, though individual variation is huge. For your first half marathon, conservative pacing beats optimism: start 15-20 seconds per km slower than you think you can sustain, assess at 10km, and gradually increase if feeling strong. Starting too fast guarantees suffering in the final third. For marathons, pacing is even more critical: the 30km wall is real, where glycogen depletion and accumulated fatigue cause dramatic slowdowns. Many first-timers target 4 hours (5:41 min/km) or 5 hours (7:06 min/km) as round-number goals. Test your planned pace on long training runs: if you can run 30km at 5:50 min/km feeling controlled, sustaining 5:41 for 42km is feasible. Use negative splits strategy: run the first half conservatively and speed up in the second half if feeling good — runners who manage this almost always finish happier than those who start fast and fade. Account for course profile: flat courses allow more aggressive pacing; hilly courses require adjustment. Weather impacts pacing dramatically: heat, humidity, wind, and rain all slow you down 5-15% so adjust targets accordingly. Most experienced runners recommend first-timers simply aim to finish feeling strong rather than chase specific times — you can always race the distance again with experience and target a time second time around. The learning from completing the distance is invaluable for pacing future attempts. Don't let ego or peers pressure you into unsustainable pacing; starting conservatively feels easy but delivers better results and more enjoyable experiences than suffering through the final 10km having started too optimistically.
UK runners increasingly train in kilometers following parkrun's 5km format and the metric measurement standard, whilst many races still market in miles. One mile equals 1.609 kilometers, so 6:00 min/km pace equals 9:39 min/mile (multiply km pace by 1.609). Conversely, 8:00 min/mile equals 4:58 min/km (divide mile pace by 1.609). This matters for training zones and race planning: a tempo run prescribed at 7:30 min/mile feels very different from the same workout at 7:30 min/km (12:03 min/mile) — confusing these units can make workouts way too hard or too easy. When following training plans, ensure you're using the correct unit matching the plan's country of origin. GPS watches typically allow switching between miles and kilometers in settings. Many UK road races use miles: 10-mile races, half marathons (13.1 miles), marathons (26.2 miles), though parkrun and cross-country use kilometers. Knowing both systems prevents confusion during races split by mile markers when you train in kilometers. For quick mental math: 5 min/km ≈ 8 min/mile, 6 min/km ≈ 9:40 min/mile, 7 min/km ≈ 11:15 min/mile. Running apps and watches display both units but it's worth understanding the conversion to interpret training zones and race paces correctly across different contexts. Some runners train using one unit for familiarity and consistency but race using another depending on event marking, so fluency in both prevents mid-race math struggles when tired.
Pace = 25 minutes ÷ 5km = 5:00 min/km. Projected 10km time at same pace: 50 minutes. Projected half marathon (conservative): approximately 1:50-1:55 (5:13-5:28 min/km accounting for distance difficulty). This is a strong recreational pace, faster than 70% of parkrun participants. At this pace, a marathon would take roughly 3:45-4:00 depending on training.
Required pace: 21.1km ÷ 120 minutes = 5:41 min/km throughout the race. To train for this, long runs should be at 6:15-6:30 min/km (conversational pace), tempo runs at 5:30-5:50 min/km, and intervals at 5:00-5:15 min/km. This goal requires consistent training including weekly long runs, tempo sessions, and probably 40-50km weekly mileage over several months.
Current pace: 30 ÷ 4 = 7:30 min/km. This is an excellent beginner pace, sustainable and appropriate for building base fitness. After 3 months consistent training, might reach 6:30 min/km. After 12 months, potentially 5:45-6:00 min/km. Projected first 5km race time: 35-37 minutes. Progress comes from consistency and gradually increasing volume rather than always trying to run faster.
Structure training using pace zones based on recent race times or fitness tests. Zone 1 (Recovery): +90-120 seconds per km slower than race pace. Use for easy days, warmups, cooldowns. Zone 2 (Easy): +60-90 seconds per km slower than race pace. Builds aerobic base, accounts for 70-80% of training. Zone 3 (Tempo): +15-30 seconds per km slower than race pace. Improves lactate threshold, done for 20-40 minute sustained efforts. Zone 4 (Threshold): Race pace for 10km-half marathon. Hard but sustainable for 30-60 minutes. Zone 5 (Intervals): Faster than 5km race pace. Short intense bursts with recovery, improves VO2 max. Most recreational runners train too hard on easy days (should be slower, building volume safely) and not hard enough on hard days (tempo and intervals should feel genuinely challenging). Elite runners spend 80% of time in Zone 1-2, only 20% in Zone 3-5 — this polarized approach builds immense base fitness while preventing burnout. Calculate your zones from a recent parkrun or race: if you ran 5km in 25:00 (5:00 min/km), your easy pace is 6:00-6:30 min/km, tempo pace 5:15-5:30 min/km, interval pace 4:30-4:50 min/km. Adjust zones every 6-8 weeks as fitness improves. On hilly routes or hot days, run by effort rather than strict pace — maintaining pace up hills or in heat can push you into wrong zones. Heart rate monitoring provides another training zone framework but pace zones work well for most runners and require no special equipment. Remember that running consistently at appropriate paces beats sporadically running too hard and getting injured or burned out.