Calories Burned Cycling over 20 mph at 65 kg — 1027 kcal per Hour
Cycling over 20 mph at 65 kg (143 lb) burns about 1027 kcal per hour. That figure comes from the activity's MET value of 15.8 in the 2011 Compendium of Physical Activities, multiplied by body weight: 15.8 x 65 kg x 1 hour = 1027 kcal. This page works the numbers out in full - for 15, 30, 45, 60 and 90 minutes, across all four weight bands, and against four comparable activities at the same weight - so you can plan sessions with real figures instead of guessing.
Cycling over 20 mph (over 32 km/h) is very fast cycling — the speed of a professional road race, a fast time trial, or a strong rider descending with a tailwind. Your breathing is at maximum effort, your legs are at full power, and holding the pace takes elite fitness, an aerodynamic bike and a low, tucked position. The Compendium rates it at 15.8 METs, one of the highest values for any activity.
Cycling over 20 mph suits competitive and elite cyclists, time triallists, and racers. The headline number to remember is 1027 kcal per hour at 65 kg, or about 514 kcal for a 30-minute ride. Everything below is an estimate: MET values are population averages, and your own burn will vary with fitness, hills, wind and the bike you ride. Treat the figures as a planning tool, not a personal measurement.
Calculate your own numbers
Use the calorie calculator to work out your own burn for cycling over 20 mph at your exact weight and session length. Enter your weight, pick the activity and set the duration, and the tool applies the same MET formula shown below. You can also try the maintenance calorie calculator to see how this session fits into your total daily energy use.
Related pages in this section:
Calories Burned Cycling over 20 mph at 55 kg — 869 kcal per Hour
Calories Burned Cycling over 20 mph at 75 kg — 1185 kcal per Hour
Calories Burned Cycling over 20 mph at 85 kg — 1343 kcal per Hour
The formula, shown and cited
The standard way to estimate the energy cost of an activity is the MET formula from the Compendium of Physical Activities (Ainsworth et al., Medicine & Science in Sports & Exercise, 2011; 43(8): 1575-1581):
Calories (kcal) = MET x body weight (kg) x duration (hours)
One MET is the energy you use sitting quietly at rest - about 1 kcal per kilogram of body weight per hour. An activity rated at 15.8 METs therefore uses 15.8 times as much energy as resting. The Compendium's MET values come from published studies that measured oxygen use during each activity, so they are measured averages, not guesses. The value used here, 15.8, is the one recorded for cycling over 20 mph in the FitCalc activity data.
Worked through for this page:
- MET for cycling over 20 mph: 15.8
- Body weight: 65 kg (the midpoint of the 60-70 kg band, 143 lb)
- Duration: 1 hour
- Calculation: 15.8 x 65 x 1 = 1027 kcal
For a 30-minute session the same calculation is 15.8 x 65 x 0.5 = 514 kcal. Nothing else is hidden in the maths - if your weight or duration changes, only those two numbers change.
Your numbers at 65 kg
| Duration | Calculation | Calories burned |
|---|---|---|
| 15 minutes | 15.8 x 65 x 0.25 | 257 kcal |
| 30 minutes | 15.8 x 65 x 0.5 | 514 kcal |
| 45 minutes | 15.8 x 65 x 0.75 | 770 kcal |
| 60 minutes | 15.8 x 65 x 1 | 1027 kcal |
| 90 minutes | 15.8 x 65 x 1.5 | 1540 kcal |
That is about 17.1 kcal per minute of cycling over 20 mph at this weight. A short session still counts: even 15 minutes burns 257 kcal, and three 15-minute sessions across a day add up to the same 770 kcal as one 45-minute session.
How the burn changes with body weight
The MET value stays the same - it describes the activity, not the person - but the calorie total scales with weight, because a heavier body costs more energy to move:
| Body weight | Calories per hour | Calories per 30 minutes |
|---|---|---|
| 55 kg | 869 kcal | 434 kcal |
| 65 kg | 1027 kcal | 514 kcal |
| 75 kg | 1185 kcal | 592 kcal |
| 85 kg | 1343 kcal | 672 kcal |
Two people doing the same activity for the same time can therefore burn quite different amounts, and that is expected - it is physics, not a mistake in the formula. If your weight sits between two rows, your figure sits between the two values.
How cycling over 20 mph compares
Here is cycling over 20 mph against four other activities at the same 65 kg, all using the same MET formula:
| Activity | MET | Calories per hour at 65 kg |
|---|---|---|
| cycling over 20 mph | 15.8 | 1027 kcal |
| cycling at racing pace (16-19 mph) | 12 | 780 kcal |
| running at 10 mph | 14.5 | 942 kcal |
| swimming butterfly | 13.8 | 897 kcal |
| boxing | 12.8 | 832 kcal |
Use this table to choose, not to judge. A higher number means a harder session, not a better one: the activity you enjoy and repeat three times a week beats the activity that burns more per hour but that you quit after a fortnight. Mixing intensities across the week - one harder session, two easier ones - is usually more sustainable than doing the hardest activity every time.
Fitting cycling over 20 mph into your week
| Sessions per week | 30 minutes each | 60 minutes each |
|---|---|---|
| 2 sessions | 1028 kcal | 2054 kcal |
| 3 sessions | 1542 kcal | 3081 kcal |
| 5 sessions | 2570 kcal | 5135 kcal |
At 15.8 METs, cycling over 20 mph is vigorous-intensity activity, so it counts double toward the widely used adult activity target: 75 minutes of vigorous activity a week is the equivalent of 150 minutes of moderate activity. Two 30-minute sessions a week already give you 60 vigorous minutes and burn about 1028 kcal a week at 65 kg. In practice almost nobody rides over 20 mph for 30 continuous minutes twice a week — it is race and time-trial pace, used sparingly.
How to use the result
Do not attempt over 20 mph without a proper road bike, a helmet, and a lot of base riding behind you. Ride in a low aerodynamic position, keep your cadence high, and use this speed only for short bursts, time trials and races — never for a whole training ride. Draft in a group when you can, because the wind at this speed is the main thing you are fighting. Fuel and hydrate carefully, because you can burn through your energy stores fast at this effort, and recover fully afterwards. If you are tracking food as well, add the ride's calories to your total daily energy expenditure for that day, and remember that the figure is an estimate with roughly 10-20% uncertainty. Do not eat back every calorie the calculator shows. If you are aiming to lose weight, keep the deficit modest - 300-500 kcal a day is a common, sustainable range - and keep your total intake above the safety floors of 1,200 kcal a day for women and 1,500 kcal a day for men unless a healthcare professional advises otherwise.
What the number does NOT tell you
The MET formula assumes steady cycling on level ground at over 20 mph, so it does not account for hills, headwinds, or drafting: at this speed, wind resistance dominates everything, and a headwind or a group can change the real figure by a large amount. It does not account for your fitness, your aerodynamics or your body composition, it does not include the afterburn that follows hard exercise, and it says nothing about the fitness gains from cycling. It also cannot tell you whether cycling this fast is safe for you: if you have a heart condition, joint problems or any other health concern, check with a healthcare professional before starting intense exercise. Use the calorie figure as a planning estimate.
Frequently asked questions
How many calories do I burn cycling over 20 mph for 30 minutes at 65 kg?
About 514 kcal. The maths is 15.8 METs x 65 kg x 0.5 hours = 514 kcal. That is an estimate from the Compendium average — hills, wind, drafting and your riding position will change the real figure.
How fast is over 20 mph in km/h?
20 mph is 32 km/h, so over 20 mph means over 32 km/h. At 21 mph, a mile takes about 2 minutes 51 seconds and a kilometre takes about 1 minute 47 seconds. That is professional road-race speed.
How many calories do I burn cycling over 20 mph per mile?
About 49 kcal per mile at 65 kg, at 21 mph. The per-hour figure of 1027 kcal is more useful for planning, because your speed will vary with hills, wind and whether you are drafting in a group.
Who can actually cycle over 20 mph?
Competitive and elite cyclists. Holding over 20 mph for an hour means a 40 km time trial in about an hour and a quarter, which is a very high standard. Recreational riders may touch 20 mph on a descent or with a tailwind, but holding it on flat ground takes years of training.
Is cycling over 20 mph dangerous?
It carries real risk, because a fall at that speed is serious. Always wear a helmet, keep your bike well maintained, ride on suitable roads, and never ride that fast in traffic or on a shared path. Build up to the speed gradually, and ride with a club or group until you are confident handling a bike at speed.
Estimates only, not medical advice. Minimum safe intakes: 1,200 kcal/day women, 1,500 kcal/day men - consult a healthcare professional before a very-low-calorie diet.