Quick Answer: A treadmill burns more calories per minute at a real jogging or running pace — 7.5-9.3 METs versus 3.5 METs for recreational trampoline bouncing, per the Compendium of Physical Activities — but it needs far more room than its own footprint suggests: ASTM F2115 calls for 78 inches of clear space behind the machine for a safe emergency dismount, a rule most home buyers never budget for. A rebounder (mini trampoline) costs less at the low end, needs only a flat 4x4 ft spot with zero rear clearance, and is easier on the joints — the better daily pick for beginners, small apartments, or anyone managing knee or ankle issues. Treadmills win on raw calorie burn per minute; rebounders win on cost, space, and consistency.

Treadmill or trampoline is one of the most common “which cardio machine should I actually buy” questions, and the honest answer depends on what’s actually limiting you — time, joints, budget, or square footage. Here’s how they compare with real numbers instead of gym-marketing claims.

At a glance

TreadmillRebounder (mini trampoline)
Intensity (METs)4.3 walking (3.5 mph) to 9.3 running (6 mph)3.5 recreational, 4.5 competitive-style
Est. calories/30 min (160 lb adult)~164 (walk) to ~355 (run)~130-170
Joint impactFirmer, consistent belt surface; impact scales with speedLower — flexing mat absorbs force
Space neededOwn footprint plus 78in rear + ~20in side clearance (ASTM F2115)4x4 ft, no rear clearance required
Typical price$180-400 budget folding, $1,000+ mid-range/smart$40 (budget) to $279 (JumpSport 250)
Power neededYes — motorized belt requires an outletNo — fully manual
Best forMatching or beating outdoor running pace indoors, structured pace/incline trainingLow-impact daily cardio, beginners, tight spaces

By the numbers

Treadmill: the intensity pick

Sunny Health & Fitness SF-T4400 Folding Treadmill

Best for structured indoor jogging/running · under $400
  • Motorized belt lets you hold a consistent 7.5-9.3 MET pace without outdoor variables like traffic, weather, or terrain — the main reason treadmills beat rebounders on calorie burn per minute.
  • Folds for storage, but still needs the full ASTM-recommended 78in of rear clearance while in use — measure the room before buying, not just the folded footprint.
  • Requires a wall outlet; unlike a rebounder, there's no cordless or outdoor-portable version of a motorized treadmill.
Check price on Amazon →

Setting up a home cardio corner? Try Amazon Music Unlimited free and queue up a running playlist before the treadmill even arrives.

A treadmill wins on raw calorie burn per minute and lets you train a specific pace or incline the way outdoor running or a trampoline can’t. The tradeoff is real: it’s the priciest option here once you’re past entry-level, it needs power, and the ASTM clearance rule means a “small” treadmill still claims a surprising amount of room once it’s actually usable.

Rebounder: the low-impact pick

JumpSport 250 Comp Fitness Rebounder

Best for daily low-impact cardio · about $249
  • Bungee-cord suspension flexes and absorbs a large share of landing force — the reason physical therapists often recommend a rebounder over running for knee, ankle, or shin issues.
  • Needs a flat 4x4 ft indoor spot with zero rear clearance, versus a treadmill's ASTM-recommended 78in safety zone behind the machine.
  • Fully manual — no outlet, no belt to maintain, and it folds flatter and lighter than any motorized treadmill for apartment storage.
Check price on Amazon →

A rebounder trades calorie-burn intensity for cost, space, and joint comfort. At 3.5 METs it tops out well under even a brisk treadmill walk, but it’s the easier daily habit for a lot of people — no learning curve, no clearance rule, and a fraction of the price of anything past entry-level treadmill tier. For the full lineup from budget folding models to the JumpSport, see our best mini trampoline guide.

Which one should you actually buy?

The honest takeaway: a treadmill’s calorie-per-minute edge is real, but it comes with a space and cost commitment that a lot of listings don’t make obvious upfront. Weigh the ASTM clearance rule against your actual room before assuming a “compact” treadmill will fit. Comparing against a full backyard trampoline instead of a rebounder? Our trampoline vs. rebounder comparison covers price, space, and safety data for that decision.