Treadmill calories burned in 30 minutes
Calories for 30 minutes on a level belt, by speed and body weight. The numbers are totals, including what your body would have used at rest. Double them for an hour.
| mph | km/h | 120 lb 54 kg | 150 lb 68 kg | 180 lb 82 kg | 210 lb 95 kg | 240 lb 109 kg |
|---|---|---|---|---|---|---|
| 2.0 | 3.2 | 72 | 90 | 109 | 127 | 145 |
| 2.5 | 4.0 | 83 | 104 | 125 | 146 | 167 |
| 3.0 | 4.8 | 94 | 118 | 141 | 165 | 189 |
| 3.5 | 5.6 | 105 | 132 | 158 | 184 | 210 |
| mph | km/h | 120 lb 54 kg | 150 lb 68 kg | 180 lb 82 kg | 210 lb 95 kg | 240 lb 109 kg |
|---|---|---|---|---|---|---|
| 5.0 | 8.0 | 248 | 309 | 371 | 433 | 495 |
| 6.0 | 9.7 | 291 | 364 | 437 | 510 | 583 |
| 7.0 | 11.3 | 335 | 419 | 503 | 587 | 670 |
| 8.0 | 12.9 | 379 | 474 | 568 | 663 | 758 |
| 9.0 | 14.5 | 423 | 528 | 634 | 740 | 846 |
| 10.0 | 16.1 | 467 | 583 | 700 | 816 | 933 |
Speeds between 3.7 and 5 mph are left out: the answer there depends on whether you walk or jog. Use the calculator and its Walking or running switch.
How it works
This calculator uses the two treadmill equations from the American College of Sports Medicine (ACSM). Each one predicts how much oxygen you use per minute from the belt speed and the incline. Burning food with one liter of oxygen releases about 5 kilocalories, so oxygen use converts straight into calories.
Walking and running get separate equations because they cost different amounts. On a level belt, the running equation charges twice as much oxygen for each meter covered as the walking one. On an incline it is the other way round: the walking equation charges twice as much for each meter climbed.
Which equation is used at which speed:
- Below 5 mph (8 km/h): the walking equation. ACSM rates it most accurate from 1.9 to 3.7 mph (50 to 100 meters per minute).
- 5 mph (8 km/h) and faster: the running equation. ACSM rates it most accurate above 5 mph (134 meters per minute).
- Between 3.7 and 5 mph neither equation is in its best range, and the answer depends on whether you walk or jog. The calculator uses the walking equation, says so, and shows what the running equation would give. Set the Walking or running switch to choose for yourself.
Two numbers come out:
- Calories burned is the total, including what your body would have used at rest over the same time.
- Above resting leaves out that resting part, so it shows the extra energy the session itself cost.
Body weight matters because you carry it with every step: the estimate rises in proportion to weight.
The formula
S = belt speed, meters per minute
(mph × 26.8224, km/h × 16.667)
G = incline as a fraction
(12% = 0.12)
kg = body weight in kilograms
walking VO2
= 0.1 × S + 1.8 × S × G + 3.5
running VO2
= 0.2 × S + 0.9 × S × G + 3.5
in ml of oxygen per kg per minute
calories
= VO2 × kg × minutes × 5 ÷ 1000
above resting
= (VO2 − 3.5) × kg × minutes
× 5 ÷ 1000Worked example
12-3-30 is a popular treadmill setting: 12% incline, 3 mph, 30 minutes. For a person who weighs 155 lb (70.3 kg):
- Speed: 3 mph × 26.8224 = 80.5 meters per minute. That is a walking speed, so the walking equation applies.
- Oxygen use: 0.1 × 80.5 + 1.8 × 80.5 × 0.12 + 3.5 = 8.0 + 17.4 + 3.5 = 28.9 ml per kg per minute.
- Calories: 28.9 × 70.3 × 30 × 5 ÷ 1000 = 305 kcal.
- Above resting: (28.9 − 3.5) × 70.3 × 30 × 5 ÷ 1000 = 268 kcal.
The incline does most of the work here: the climbing part of the equation (17.4) is about 2.2 times the level-walking part (8.0). On a level belt the same 30 minutes at 3 mph comes to 122 kcal.
12-3-30 calories burned by body weight
12-3-30 means 12% incline, 3 mph and 30 minutes, a treadmill setting that became popular on social media. At 3 mph it is a walk, so the walking equation applies. On a treadmill that shows kilometers per hour, 3 mph is 4.8 km/h.
| Weight | In kg | Calories | Above resting |
|---|---|---|---|
| 120 lb | 54 | 236 | 208 |
| 140 lb | 64 | 276 | 242 |
| 160 lb | 73 | 315 | 277 |
| 180 lb | 82 | 354 | 311 |
| 200 lb | 91 | 394 | 346 |
| 220 lb | 100 | 433 | 381 |
| 240 lb | 109 | 472 | 415 |
| 260 lb | 118 | 512 | 450 |
By the equations, 12-3-30 uses 28.9 ml of oxygen per kg per minute, a little less than running at 5 mph on a level belt (30.3).
A lab study has measured it. Wong and colleagues (2025) had 14 recreationally active adults do 12-3-30 without holding the handrails while a metabolic analyzer measured their energy use from the air they breathed. They burned 308 kcal on average (standard deviation 59). The 16 people who enrolled weighed 75.4 kg (166 lb) on average, and for that weight the walking equation gives 327 kcal, about 6% more than was measured. In the same study, running at a self-chosen pace burned the same total in about 24 minutes.
Calories by treadmill incline
How much an incline adds to a 30-minute walk at 3 mph. In the walking equation each 1% of incline adds 18% of the cost of walking on the level, before the resting part is counted. The 12% row is 12-3-30.
| Incline | 120 lb 54 kg | 150 lb 68 kg | 180 lb 82 kg | 210 lb 95 kg | 240 lb 109 kg |
|---|---|---|---|---|---|
| 0% | 94 | 118 | 141 | 165 | 189 |
| 2% | 118 | 147 | 177 | 206 | 236 |
| 4% | 142 | 177 | 212 | 248 | 283 |
| 6% | 165 | 207 | 248 | 289 | 330 |
| 8% | 189 | 236 | 283 | 331 | 378 |
| 10% | 213 | 266 | 319 | 372 | 425 |
| 12% | 236 | 295 | 354 | 413 | 472 |
| 15% | 272 | 340 | 407 | 475 | 543 |
How accurate is it
- The equations describe an average adult, so your own figure can sit above or below the estimate. In the 12-3-30 study above, the walking equation came out about 6% above the measured group average.
- Each equation has a speed range where ACSM rates it most accurate: 1.9 to 3.7 mph for walking and above 5 mph for running. Outside those ranges the calculator still gives a number and marks it as rough.
- The calculator treats the session as one steady effort at the speed and incline you enter. For intervals, or a session where the settings change, work out each block and add them up.
- Oxygen is converted to energy at 5 kcal per liter, the same figure as the running calories calculator. ACSM’s conversion table lists 4.9, which would make every result about 2% lower.
- The incline has to be 0% or more. The equations are not used here for downhill belts.
Questions
How many calories does 12-3-30 burn?
By the ACSM walking equation, about 236 kcal at 120 lb, 295 at 150 lb, 354 at 180 lb and 413 at 210 lb, counting what you would have used at rest. In a lab study, 14 adults averaged 308 kcal. The 12-3-30 table has more weights.
How do you calculate calories burned on a treadmill?
Turn the belt speed into meters per minute, put it and the incline into the ACSM walking or running equation to get oxygen use, then multiply by body weight in kg, by the minutes and by 5, and divide by 1000. For a 155 lb person running at 6 mph on a level belt for 30 minutes that comes to 376 kcal. The calculator shows this working for your own numbers.
How many more calories does walking on an incline burn?
In the walking equation, each 1% of incline adds 18% of the cost of walking on the level. For a 180 lb person walking at 3 mph for 30 minutes, that is 141 kcal at 0%, 212 at 4%, 283 at 8% and 354 at 12%.
Why does my treadmill show a different number?
A treadmill console or a watch may use a different formula, or other inputs such as heart rate, so the numbers rarely match exactly. This calculator uses the ACSM equations and prints its working, so you can see where its number comes from. To follow your own sessions over time, compare numbers from the same source.
Should I use total or above-resting calories?
Total includes the energy your body would have used anyway in that time, which the equations put at about 1.05 kcal per kg of body weight per hour. Above resting is the extra energy the session cost. Use the one that matches what you are comparing it with.
Does this work for running outdoors?
The running equation is the same one, but outdoors you usually know distance and time, not belt speed. The running calories calculator takes distance, time and average incline. For belt speed as a pace, see the treadmill pace chart.
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Sources
- American College of Sports Medicine. ACSM’s Guidelines for Exercise Testing and Prescription. 11th ed. Wolters Kluwer; 2021. Metabolic equations for walking and running, and the speeds at which each is most accurate.
- Wong MWH, Davis DW, Perez OR, Weyers B, Green D, Garcia A, Navalta JW. An exploratory study comparing the metabolic responses between the 12-3-30 treadmill workout and self-paced treadmill running. International Journal of Exercise Science. 2025;18(6):56-64.