Calories Burned Biking Calculator

How the estimate is built

The estimate rests on metabolic equivalents, the MET method the Compendium of Physical Activities publishes for every form of exercise. One MET is the energy a body burns sitting still, defined as 3.5 milliliters of oxygen per kilogram of body weight per minute. Every activity gets a multiplier: a flat road ride at 14 mph carries 10.0 METs, a mountain trail 8.5, an e-bike with high assist 4.0.

The arithmetic that turns a MET into calories:

calories per minute = MET x 3.5 x body weight in kg / 200

Weight enters in kilograms, so a scale reading in pounds gets divided by 2.2046 first. A 180 pound rider weighs 180 / 2.2046 = 81.65 kg, and at 10.0 METs that rider burns 14.29 calories a minute. Multiply by the minutes in the saddle and the ride total falls out.

The MET values come from the Compendium's bicycling table, which lists every road, trail, indoor and e-bike code researchers use. Every number on this page is built on the 2024 edition of that table.

Worked example: 12 miles at 14 mph

A 180 pound rider heads out for 12 miles on flat pavement at 14 mph. The ride takes 12 / 14 = 0.857 hours, which is 51.4 minutes.

At 14 mph the road band gives 10.0 METs. Calories per minute = 10 x 3.5 x 81.65 / 200 = 14.29. Over 51.4 minutes that comes to 14.29 x 51.4 = 734.5, so call it 735 calories. The same ride in other units: 734.5 / 12 = 61.2 calories per mile, and 14.29 x 60 = 857 calories per hour.

Two details deserve attention. The 14 mph pace sits inside the Compendium's 14 to 15.9 mph band, and a band carries one MET value, so a ride at 15.5 mph gets the same multiplier. And the ride length comes out of the division, so an honest average speed matters more than a GPS top speed.

Calories per hour and calories per mile

The table holds the rider at 180 pounds and walks the speed up. Calories per hour climb steeply because a faster ride packs more METs into the same 60 minutes. Calories per mile move far less, and inside one band they even fall.

Compare the 16 and 18 mph rows: both sit in the 16 to 19 mph band at 12.0 METs, so the faster rider burns the same amount per minute but finishes each mile sooner, and the per-mile number drops from 64.3 to 57.2. Then the band edge at 20 mph jumps to 16.8 METs and the per-mile cost leaps to 72.0. The bands are coarse, and real rides sit between the steps.

The pattern behind the table is aerodynamic drag. The power needed to push air out of the way grows with the cube of speed, which is why the hourly number roughly quadruples from 8 mph to 20 mph while the per-mile number stays between 43 and 72. Distance measures work against the road; time measures work against the air.

E-bikes change the effort, not the miles

The 2024 Compendium lists three e-bike codes, and the spread between them is wide: 6.8 METs when the motor does nothing, 6.0 with light support, and 4.0 with high support. The miles stay the same; the assist level is what changes the bill.

For the 180 pound rider on the same 12 mile route at 14 mph, the three levels come out as 735 calories unassisted, 440 with light assist, and 294 with high assist. Light assist keeps 60 percent of the workout and high assist keeps 40 percent. A rider who wants the exercise still gets it: even the high-assist ride, taken daily, is worth about 0.6 pounds of fat a week.

That partial credit is why e-bikes show up in activity research. The CDC activity guidelines count 150 minutes of moderate effort a week, and moderate starts at 3.0 METs, so a 6.0 MET light-assist commute counts toward it in full.

Mountain trails, BMX and the daily commute

Off-road riding carries its own codes. A general mountain trail ride is 8.5 METs, which for the 180 pound rider is 729 calories an hour, and sustained uphill at vigorous effort jumps to 14.0 METs, or 1,200 an hour. Rough ground costs more than the speedometer suggests because the rider works against roots, ruts and grade instead of rolling freely.

The commute code is 6.8 METs at a self-selected pace, between a leisurely road ride and a trail. The math on a 5 mile each-way commute at 12 mph: 25 minutes each way, 11.43 calories a minute, 286 per leg. That is 572 a day, 2,858 across a five day week, and about 12,375 a month, which works out to 3.5 pounds of fat equivalent if intake holds steady.

How rider weight scales the total

Body weight enters the formula directly, so the total scales with it. The table holds the same 12 miles at 14 mph and moves only the rider.

Two riders finishing together can differ by nearly 500 calories, and the difference is mass, not effort. That is also why generic charts built on a 155 pound reference rider overshoot a 250 pound rider by about 60 percent and overstate a 130 pound rider by about 18 percent. Use your own scale reading, taken before the ride rather than after a hot day's water loss.

Biking against running and walking

Cycling is the cheap way to move a mile and a good way to spend an hour. Per mile the bike costs about 0.34 calories per pound of body weight, against 0.74 for running and 0.52 for walking. Per hour the ranking flips: at each activity's normal pace the cyclist at 857 beats the 6 mph runner at 797 and leaves the 3 mph walker at 283 far behind.

The gap explains both common complaints. A runner who switches to cycling and keeps the same mileage will see progress stall, because 12 running miles cost 0.74 x 180 x 12 = 1,598 calories and 12 cycled miles cost 735. A cyclist who measures by time rather than miles gets the full workout: an hour on the bike at 14 mph is an hour of running-grade effort, and the deficit math only knows hours and calories.

What the estimate leaves out

The MET table assumes a steady pace on level ground with no wind, and a real ride rarely meets those conditions. Wind is the big one: 10 mph of headwind at a 14 mph ground speed feels like 24 mph of air, and drag cost rises with the cube of relative wind. Drafting behind another rider cuts the same cost, which is why group rides at the same speed burn less per person.

Coasting, traffic lights and downhills lower the average below the table value; hills and gravel raise it. Fitness moves the number by around 10 percent in either direction. A wrist device estimates cycling badly because the arm barely moves, so expect a watch or phone reading to disagree with this page by a double digit percent. Enter weight, distance and an honest average speed here and the estimate lands close to what a calibrated power meter would report after conversion.