Bike Pace Calculator

Bike pace vs bike speed

Cyclists usually talk in speed – 25 km/h or 15 mph – because bike computers display it. Runners usually talk in pace. Pace is useful for cyclists too: it makes it easy to see how long each kilometre or mile takes and to plan a target finish time. As speed goes up, pace (minutes per kilometre) goes down.

Formulas for speed, pace, time and distance

• Speed (km/h) = distance (km) ÷ time (hours)
• Pace (min/km) = time (minutes) ÷ distance (km) = 60 ÷ speed
• Time = distance ÷ speed
• Distance = speed × time

Worked example: a 40 km ride

You ride 40 km in 1 hour 30 minutes. Speed = 40 ÷ 1.5 = 26.7 km/h. Pace = 90 minutes ÷ 40 = 2.25 minutes per km, or 2:15 per km. In miles, 40 km is 24.9 miles, so speed is 16.6 mph and pace is 3:37 per mile.

Speed to pace conversion table

Finish times at common speeds

What is a good average cycling speed?

It depends on terrain, wind, bike, traffic and whether you are riding alone or in a group, so there is no single standard. As a rough guide for solo riding on mostly flat roads: many newer riders average about 15–20 km/h (9–12 mph), regular fitness riders 20–25 km/h (12–16 mph), strong club riders 25–30 km/h (16–19 mph), and racers more than that. Hilly routes, stop-start city riding and heavy bikes all lower the average.

Compare your rides with your own past rides on the same route – that tells you more about improving fitness than any table.

Moving time vs elapsed time

Bike computers and apps usually show average speed based on moving time, pausing when you stop. For event planning, use elapsed time, which includes traffic lights, food stops and mechanicals – it can be 10–20% longer on a long ride.

What affects your cycling pace?

• Wind – the biggest outdoor factor. Air resistance grows with the square of your speed through the air, so a headwind costs far more than a tailwind gives back on an out-and-back course.
• Gradient – climbing is dominated by weight; descending gains some time back but never all of it.
• Drafting – riding behind another rider can save a large share of the effort at road speeds, which is why group rides are faster.
• Position and clothing – a lower, narrower position and close-fitting kit reduce drag.
• Tyres and pressure – supple, well-inflated tyres roll faster; very high pressure on rough roads can be slower.
• Cadence – most riders are efficient around 80–95 rpm; grinding low cadences tires the legs faster.

Using it as an Ironman or triathlon bike pace calculator

An Ironman bike leg is 180.2 km (112 miles) and a 70.3 bike leg is 90 km (56 miles). Enter your target speed to see your bike split, then work backwards from your goal overall time. Pacing matters more than raw speed: riding the first hour too hard usually costs more time on the run than it saves on the bike. Many coaches set the bike effort by power or heart rate and let speed follow – wind and hills change speed, but steady effort keeps the run intact. Always check your race's bike cut-off time.

Indoor bikes: BikeErg and air bikes

Indoor machines estimate distance from flywheel speed, so their numbers are not directly comparable with road riding. The Concept2 BikeErg shows pace per 1,000 m by default, which is the same idea as min/km – a 1:45 /1,000 m pace equals about 34.3 km/h on the monitor. Air bikes such as the Assault AirBike also show an estimated distance alongside calories and watts; use the calculator to convert it into speed or pace for tracking your own progress, but compare indoor sessions only with other sessions on the same machine.

Target speed for a goal finish time

These are moving averages. Add expected stop time for long events, and remember that hilly or windy courses need a higher effort to hold the same average.

Pacing a long ride

• Start easier than you feel you can – the first 20–30 minutes set up the rest of the ride.
• Aim for even effort, not even speed: ease up on climbs into a headwind, and use descents to recover.
• Eat and drink early and regularly on rides over about 90 minutes.
• Many riders aim for a slightly faster second half (a negative split) in time trials and triathlons.

Kilometres or miles?

Most of the world uses km/h and min/km; the US and UK road signs use miles, and many UK and US riders quote mph. One mile is 1.609 km, so multiply mph by 1.609 for km/h, or divide km/h by 1.609 for mph. The calculator switches units with one tap and keeps your inputs.

How to ride faster over time

Consistency matters most: riding three or four times a week, with one longer ride and one session of harder intervals, improves average speed for most riders within a few months. Ride with a slightly faster group to learn drafting skills, check that your bike fits and your tyres are pumped to the right pressure, and track one regular loop so you can see progress.

Sources

1. IRONMAN – race distances (3.8 km swim, 180.2 km bike, 42.2 km run) — ironman.com
2. Concept2 – BikeErg monitor and pace units — concept2.com