Neither machine has a meaningful advantage over the other for weight loss. When researchers tested treadmills and ellipticals at the same perceived effort level, energy expenditure was nearly identical. The machine that helps you lose weight is the one you’ll use consistently, at an intensity that challenges you, for enough total minutes each week.
That said, the two machines differ in ways that matter: joint impact, which muscles work hardest, and how hard the workout feels. Those differences can determine which one you actually stick with, and consistency is the single biggest factor in long-term fat loss.
Calorie Burn Is Essentially the Same
A study published in the Journal of Strength and Conditioning Research had healthy adults perform 15-minute exercise tests on both a treadmill and an elliptical at the same self-selected effort level (a moderate “somewhat hard” pace). Energy expenditure was not significantly different between the two machines. Oxygen consumption, the most reliable measure of how many calories your body is actually burning, was also comparable.
One interesting quirk: heart rate ran higher on the elliptical even though the actual calorie burn was the same. This likely happens because the elliptical involves both upper and lower body movement, which can elevate heart rate without necessarily increasing total energy output. So if your elliptical display says you burned 500 calories based on heart rate, it may be overestimating slightly. The same applies to treadmill calorie counters, which are notoriously loose with their estimates. Neither machine’s built-in display should be treated as precise.
How Each Machine Feels Different
Even though the overall calorie burn is similar, the two machines load your body differently. Research using muscle activity sensors found that lower extremity muscles are generally more active during treadmill running than during elliptical exercise, with the exception of the quadriceps, which showed similar activation on both machines. Walking and running on a treadmill require your muscles to absorb impact with every stride, which demands more work from your calves, hamstrings, and glutes.
The elliptical, meanwhile, tends to feel harder on the legs even when the actual workload is equivalent. A separate study comparing perceived exertion found that overall effort ratings were the same on both machines, but participants rated their leg exertion as significantly higher on the elliptical (12.5 versus 11.2 on a standard effort scale). The continuous pedaling motion without any rest phase between strides likely explains this. Your legs never fully unload the way they do between footstrikes on a treadmill.
For weight loss purposes, this perception matters. If the elliptical makes your legs feel more fatigued, you may cut sessions short or avoid the machine altogether. Conversely, some people find that the gliding motion feels smoother and more tolerable than running, which keeps them going longer.
Joint Impact and Injury Risk
The elliptical’s biggest practical advantage is its low impact. Because your feet stay on the pedals throughout the motion, you eliminate the repetitive ground reaction forces that come with every running stride. As exercise physiologists at the Hospital for Special Surgery note, this removes significant stress from the knees, hips, and lower back. If you have joint pain, arthritis, or a lower body injury, the elliptical lets you maintain a high cardiovascular effort without the pounding.
Injury data supports this. A national analysis of emergency department visits from 2007 to 2011 found roughly 46,000 treadmill-related injuries treated in U.S. emergency departments during that period, compared to about 3,600 elliptical-related injuries. Treadmill injuries were spread across the body: 36% involved the lower extremities, 31% the upper extremities (often from falls), and 19% the head and neck. Elliptical injuries skewed heavily toward the lower extremities at 44%, with far fewer upper body and head injuries, likely because there’s no moving belt to fall off of.
These numbers don’t account for how many people use each machine (treadmills are far more common in homes), so you can’t directly compare injury rates per user. But the pattern is clear: treadmills carry a higher risk of falls and impact-related injuries, while ellipticals are more forgiving.
What Actually Drives Weight Loss on Either Machine
Since calorie burn per minute is comparable, the variable that matters most is total weekly volume. Current exercise guidelines recommend at least 150 minutes per week of moderate-intensity activity for general health. For weight loss specifically, you typically need to exceed that baseline, either by adding more minutes, increasing intensity, or both.
A practical starting point is 30 minutes of brisk effort five days per week. If that’s already easy for you, the next step is adding 10 minutes to three of those sessions, or introducing intervals where you push to a vigorous pace for short bursts. Gradually working toward 200 to 300 minutes per week is the range where most people see measurable fat loss, assuming their diet isn’t offsetting the calorie deficit.
On a treadmill, you can increase intensity by raising the speed or the incline. Walking at a steep incline (sometimes called “incline walking”) can push your heart rate into a vigorous zone without requiring you to run, which is useful if running bothers your joints. On an elliptical, you increase intensity by raising the resistance level, increasing your stride rate, or using the arm handles more aggressively to involve your upper body.
Which One to Choose
Pick the elliptical if you have knee, hip, or back pain, if you’re recovering from a lower body injury, or if you simply find the motion more comfortable. The zero-impact gliding lets you train at high intensities without the joint stress of running. It’s also a reasonable choice if you want to involve your arms more actively during cardio.
Pick the treadmill if you enjoy walking or running, if you’re training for a race or event that involves actual locomotion, or if you find that the natural gait pattern keeps you more engaged. Treadmill exercise also offers more variety in how you can structure workouts: walking, jogging, sprinting, incline hiking, or mixing all of them in a single session.
If you have access to both, alternating between them may be the best approach. Using two machines reduces repetitive strain from doing the same motion every day, keeps workouts less monotonous, and lets you train through minor aches by switching to the lower-impact option when your joints need a break. The difference in fat loss between the two machines is negligible. The difference between using a machine regularly and abandoning it after three weeks is enormous.