What Exercise Burns the Most Calories? Ten Activities by the Hour

Of the common exercises, running burns the most calories per hour, and it rates higher the faster you go. At 10 mph, a 6 minute mile, the 2024 Adult Compendium of Physical Activities gives 14.8 METs: about 1,036 kcal an hour for a 70 kg (154 lb) adult. An hour at that pace is a stretch, so read it as a ceiling. At 8 mph it’s 840 kcal. Rope skipping, cross-country skiing and hard intervals land within one MET of that row. The ranking matters less than the minutes you spend and what you weigh.

What Exercise Burns the Most Calories Per Hour?

Running does, and the faster the more. A handful of other hard efforts sit within a MET or so of the 8 mph row, and rowing at 200 watts or more sits between 8 and 10 mph. A MET is the energy you use sitting still, about 1 kcal per kg of body weight per hour. So calories an hour equal METs × kg. The Compendium’s own conversion page gives that rule, and its 2024 update calls anything at 6.0 METs or above vigorous.

I opened six Compendium pages and took ten vigorous codes that a fit adult could repeat for 20 minutes or more. That cut is mine, not the Compendium’s. Each code links to the page where its MET value stands.

#	Activity	Code	METs	55 kg (121 lb)	70 kg (154 lb)	90 kg (198 lb)
1	Running, 10 mph (6 min/mile)	12120	14.8	814 kcal	1,036 kcal	1,332 kcal
2	Running, 8 mph (7.5 min/mile)	12090	12.0	660 kcal	840 kcal	1,080 kcal
3	Cross-country skiing, 5.0 to 7.9 mph, brisk	19100	11.3	622 kcal	791 kcal	1,017 kcal
4	Rope skipping, general	02068	11.0	605 kcal	770 kcal	990 kcal
5	Rowing machine, 150 to 199 watts	02073	11.0	605 kcal	770 kcal	990 kcal
6	High intensity intervals (burpees, mountain climbers, Tabata)	02214	11.0	605 kcal	770 kcal	990 kcal
7	Cycling, 14 to 15.9 mph	01040	10.0	550 kcal	700 kcal	900 kcal
8	Swimming laps, freestyle, fast	18230	9.8	539 kcal	686 kcal	882 kcal
9	Kettlebell swings	02058	9.8	539 kcal	686 kcal	882 kcal
10	Running, 6 to 6.3 mph (10 min/mile)	12050	9.3	512 kcal	651 kcal	837 kcal

Row 1 is a ceiling, and it is not the end of the running codes. They give 16.8 METs at 11 mph (code 12130) and 23.0 at 14 mph (code 12135). Running uphill on a 15% incline is 17.5 (code 12325). I treated those as race-pace and steep-grade efforts, not an ordinary hour. A steadier reference is row 2, 8 mph at 840 kcal.

Rows 2 to 6 span 1.0 MET, which is 70 kcal an hour at 70 kg. Treat them as one tier. Swimming sits lower than many people expect: fast laps rate just under fast cycling. How many calories swimming burns breaks that down by stroke.

Machines have a trap of their own. Their codes go by power, so the label matters less than the watts on the display. A rowing machine is rated 7.5 METs at 100 to 149 watts, 11.0 at 150 to 199 and 14.0 at 200 or more. A stationary bike is rated 8.0 METs at 126 to 150 watts, 10.3 at 151 to 199 and 10.8 at 200 to 229. On the same rowing machine, easy and hard efforts differ by nearly a factor of two. I kept the 150 to 199 watt band in the table because I judged it the realistic one. At 200 watts or more, rowing rates above running at 8 mph but below 10 mph. The order depends on the watts you hold.

Every figure is a total, and it includes the 1 MET you’d use sitting on the couch. Subtract one MET to get the extra a session adds. At 10 mph and 70 kg that’s 13.8 × 70 = 966 kcal extra, not 1,036. For the resting share across a whole day, see how many calories you burn in a day.

If you walk, the steps to calories calculator applies Compendium METs to your steps and separates the total from the extra. For comparison, brisk walking at 3.5 to 3.9 mph (code 17200) is rated 4.8 METs, or 336 kcal an hour at 70 kg. Calories burned walking breaks that down per mile and per step.

Does Running Really Beat Everything Else?

Only on speed. Divide the Compendium’s MET value by the speed in mph and you have the energy for one mile. At 8 mph that’s 12.0 ÷ 8 = 1.5 kcal per kg, or 105 kcal at 70 kg. At 10 mph it is 14.8 ÷ 10 = 1.48, or 104 kcal. Jogging at 6 to 6.3 mph (9.3 METs) comes to 1.48 to 1.55 kcal per kg, so 103 to 109 kcal a mile. Brisk walking at 3.5 to 3.9 mph and 4.8 METs lands at 86 to 96 kcal.

Per mile, all four sit within 25 kcal. Per hour, the 10 mph runner covers ten miles and the walker covers under four. Run a slow mile or a fast one and the mile costs about the same, but the fast runner finishes sooner and can start another.

There’s an outside check. The CDC’s table of activity calories for a 154 lb (70 kg) person lists running at 5 mph at 590 kcal an hour. The Compendium rates 5.0 to 5.2 mph at 8.5 METs, and 8.5 × 70 = 595.

What Matters More: the Exercise, the Minutes or Your Weight?

In this table the minutes and your weight move the total further than the row does. Start with minutes. Twenty minutes of running at 10 mph at 70 kg is 14.8 × 70 ÷ 3 = 345 kcal. Forty-five minutes of cycling at 14 to 15.9 mph is 10.0 × 70 × 0.75 = 525 kcal. A full hour of brisk walking is 336 kcal. Slower wins whenever you can keep it going longer.

Now the same idea on a fixed target. I picked 300 kcal at 70 kg as a yardstick and worked out the minutes each activity needs. The last column removes the resting MET, so it counts extra energy only.

Activity	METs	Minutes to reach 300 kcal (total)	Minutes to reach 300 kcal (extra only)
Running, 10 mph	14.8	17	19
Running, 8 mph	12.0	21	23
Rope skipping, rowing machine or intervals	11.0	23	26
Cycling, 14 to 15.9 mph	10.0	26	29
Swimming laps (fast) or kettlebell swings	9.8	26	29
Running, 6 to 6.3 mph	9.3	28	31
Brisk walking, 3.5 to 3.9 mph	4.8	54	68

The hard efforts need 17 to 28 minutes. A brisk walk needs close to an hour, at a pace many people find easier to repeat.

Weight matters just as much. A 90 kg adult jogging at 6 to 6.3 mph (9.3 METs) uses 837 kcal an hour. A 55 kg adult running at 8 mph uses 660. The heavier body comes out 177 kcal ahead doing the slower activity, because the sum multiplies by kilograms. Moving from 55 to 90 kg adds 518 kcal an hour at 14.8 METs. The gap from first place to tenth at 70 kg is 385.

Now your own sum. Say you weigh 64 kg and swim fast laps for 40 minutes. That’s 9.8 × 64 × 40 ÷ 60 = 418 kcal.

A mixed session needs one line per effort. Take 50 minutes at 70 kg: 5 minutes of brisk walking at 4.8 METs, 40 minutes of jogging at 9.3, then 5 minutes of walking. The lines are 28 + 434 + 28 = 490 kcal. Calling the whole 50 minutes jogging would give 543.

The table is also an average. The Compendium’s authors write that it can serve as a starting point but does not reflect precise individual values. They cite one study of women. Those with a BMI of 33.9 used about 8% to 15% more energy across treadmill speeds than those with a BMI of 21.6. Your own hour can land above or below its row. Expect that.

Does the Afterburn Change the Ranking?

A little, and only after hard sessions. Afterburn is the extra oxygen your body uses while it recovers, called excess post-exercise oxygen consumption, or EPOC. A review in Sports Medicine found that EPOC grows with intensity along a curve and with duration along a straighter line. It found no sustained EPOC after low intensity or short exercise.

The best measured number I found comes from a metabolic chamber. Ten men, aged 22 to 33, rode a bike for 45 minutes at about 73% of maximal oxygen uptake. That used a net 519 kcal. Energy use then stayed 190 kcal above a rest day for 14 hours, which is 37% on top of the ride’s own cost.

A systematic review of 22 studies compared high intensity intervals with moderate continuous exercise. Where studies measured for longer than three hours, intervals averaged about 289 kJ of afterburn against about 159 kJ. Divide by 4.184 and that’s roughly 69 kcal against 38 kcal. The authors say the methods need standardising before the duration is pinned down.

The afterburn is real. It’s also small beside the session. A 70 kg person running 20 minutes at 10 mph spends about 345 kcal doing it. The 22-study review puts the aftermath at tens of kcal, and the 190 kcal came after 45 minutes of hard cycling in ten men. I found no figure that would fit your own session, so my table leaves it out. How many calories weight lifting burns covers the lifting side.

How Far Can You Trust the Numbers?

Treat each figure as a fair guess for a stated effort, not a reading of your body.

Your watch is the weakest link. In a Stanford test, 60 volunteers wore seven wrist devices while sitting, walking, running and cycling, with indirect calorimetry as the reference. No device kept its energy error below 20%. Error was lowest in cycling and highest in walking. Use the watch for heart rate and time, and take its calorie line with salt. How accurate Apple Watch calorie burn is looks at one of the devices in detail.

The codes have limits too. A row describes the effort in its name, and “high intensity intervals” is 11.0 METs while you’re working. A 20 minute class with rests between rounds isn’t 20 minutes at 11.0 METs, so the full figure overstates it. Pick the row that matches the work and count only those minutes.

Calories don’t turn into weight one for one, either. The CDC says that most weight loss occurs from decreasing calories, and that keeping it off takes regular physical activity. A review of exercise trials in Obesity Reviews found that weight loss from exercise came out lower than predicted. Its list of reasons included higher food intake and less activity outside the session, and it blamed the small losses mainly on low prescribed doses. Neither source gives you a result to expect. My table prices one session and says nothing about the week around it. For how the two fit together, calorie deficit and working out goes through it step by step.

Which Exercise Should You Pick, Then?

The one you’ll do again next week. The top row of the table is worth nothing if you quit it in a fortnight. Access counts too. Skiing needs snow and laps need a pool with free lanes, while running needs shoes and a door. A systematic review of 24 studies found that feeling better during moderate exercise went with more activity later, while mood afterward didn’t. That’s an association, so it’s a reason to pick something you can tolerate and no proof that enjoyment causes the habit.

Health guidelines are written in minutes. The CDC says adults need 150 minutes of moderate activity a week, or 75 minutes of vigorous activity, or an equivalent mix. It adds muscle-strengthening on at least 2 days. In energy terms at 70 kg, 75 minutes of running at 8 mph is 1,050 kcal and 150 minutes of brisk walking is 840 kcal, so the hard version takes half the time for a quarter more energy. Either one covers the aerobic part of the guideline. The hard one is quicker. The easy one is simpler to repeat.

One caution. With a heart or joint condition, or after a long stretch of inactivity, talk to your doctor before starting anything in the first ten rows.

For today, choose one row you’d do again. Multiply your weight in kilograms by its METs and by the hours you really worked. Log that number against the activity instead of the watch’s number. Do it for a week.