What Amplitude Do I Need in a Massage Gun?
Across the 16 models in our Stall Force Reality Index, massage gun amplitude runs from 7mm on compact devices to 18mm on the longest-stroke model, with mid-tier guns clustering at 12mm and flagship models at 16mm — so the practical question is which band you're buying into, not a single magic number. Amplitude is stroke length measured unloaded; whether that stroke holds up under hand pressure is decided by stall force, a separate spec.
The three amplitude bands in the current market
- 7-10mm — compact / budget: Bob and Brad Q2 Mini (7mm, the shortest in our dataset) and Renpho R3 Active (10mm). Shorter stroke is the built-in cost of a smaller housing.
- 12-15mm — mid-tier: Ekrin B37S, Opove M3 Pro, Hyperice Hypervolt 2, and Mebak 3 all publish 12mm; the Opove M3 Pro Max stretches to 15mm and the Hypervolt 2 Pro to 14mm.
- 16-18mm — flagship: the Theragun line (Prime, Elite, Pro, Pro Plus) and Achedaway Pro all publish 16mm, and the TimTam All-New PowerMassager publishes the single longest figure we tracked at 18mm.
If you want to shop the long-stroke end of the market, this live Amazon search for 16mm-amplitude massage guns resolves to current listings rather than a fixed product, so it keeps working when sellers rotate stock. Check the amplitude figure on the listing itself before buying — and check whether stall force is disclosed at all.
The one thing to know: Amplitude (the distance the head travels per stroke, in millimeters) and RPM/PPM (how many of those strokes happen per minute) measure two different things, and higher numbers in either do not automatically mean a 'better' device. A short-amplitude gun spun to a very high RPM produces rapid, shallow vibration; a long-amplitude gun run at a moderate RPM produces deeper per-stroke displacement at a slower pace. Neither combination is universally superior — they are a tradeoff, and the honest comparison point is amplitude, RPM, AND stall force together, not any single number in isolation.
Why amplitude alone can't answer the question
Amplitude and RPM are the two specs every massage-gun listing leads with, but neither one tells you what happens when you actually press the device into muscle. Stall force — the amount of resistance, in pounds, at which the motor stops moving the arm — is the spec that answers that question, and it is the one manufacturers are least consistent about disclosing. A gun with a long, impressive-sounding amplitude can still stall out under firm real-world pressure if its motor is underpowered, while a shorter-stroke gun with a strong motor can hold its stroke length under load. Read the amplitude and RPM as marketing headlines; read stall force, when it is disclosed and verifiable, as the closer proxy for real-world firmness.
This page reports equipment-spec information only, not medical advice or a health-outcome claim.
Frequently Asked Questions
It depends on the depth of stroke you want, not on any single 'correct' number: across the 16 models in our Stall Force Reality Index, compact devices sit at 7-10mm, most mid-tier models at 12mm, flagship models cluster at 16mm, and the longest published figure is 18mm (TimTam All-New PowerMassager). A longer amplitude means more head travel per stroke; a shorter one means shallower, faster-feeling percussion.
Longer, not automatically better. 16mm moves the head further per stroke than 12mm, but whether that stroke length survives real hand pressure depends on stall force. The Theragun Elite (16mm, 40 lbs published stall force) has a longer stroke but a lower published stall force than the Opove M3 Pro (12mm, 70 lbs claimed), so the two specs have to be read together.
The shortest in the category. The Bob and Brad Q2 Mini publishes 7mm — the shortest amplitude in our 16-model dataset — and the budget Renpho R3 Active publishes 10mm. Amplitude is mechanically limited by the internal arm's travel, so a pocket-sized housing physically cannot deliver a flagship-length stroke.
No. Amplitude is the most commonly disclosed of the core specs, but it still goes missing: in our dataset, the Bob and Brad C2 and the Hyperice Hypervolt 3 have no manufacturer-published amplitude figure we could verify. When a spec is undisclosed we mark it 'not disclosed' rather than guessing.