What Is Stall Force?
Stall force is the amount of resistance, measured in pounds, at which a massage gun's motor can no longer keep moving its arm through a full stroke and stops. Unlike amplitude and RPM, which are measured with the device running unloaded, stall force is specifically measured under load — making it the closest available proxy for what a device actually feels like once you press it into muscle.
The one thing to know: 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.
How stall force is typically measured
Independent reviewers commonly press a running device's head into a bathroom or kitchen scale, or a dedicated load cell, and increase pressure steadily until the motor audibly stalls out. The reading at that moment is the stall-force figure. Manufacturer-published stall-force numbers may use a different, undisclosed lab method — one reason our Stall Force Reality Index flags whether each figure is a manufacturer claim or an independent third-party measurement.
Published stall-force figures vary widely
Across the 16 models in our dataset, published stall force ranges from 30 lbs (Theragun Prime) to 80 lbs (Achedaway Pro, TimTam All-New PowerMassager). Several models — including Hyperice's standard Hypervolt 2 and Opove's M3 Pro Max — do not publish a verifiable stall-force figure at all. See the full table in the Stall Force Reality Index.
This page reports an equipment-spec definition only, not a health or safety claim. If you have an injury or medical condition, consult a licensed clinician before using a percussive therapy device.
Frequently Asked Questions
Stall force is the amount of resistance, measured in pounds, at which a massage gun's motor can no longer keep moving its arm through a full stroke and stops (stalls). It is typically tested by pressing the running device's head into a load cell or scale until the motor audibly stalls, and the reading at that point is the stall force figure.
Amplitude describes stroke length with no load applied. The moment you press a device into muscle, the motor is working against resistance, and a low stall force means the stroke shortens or stops well before a high-stall-force device would. Two guns with identical advertised amplitude can feel very different once you actually apply hand pressure.
Independent reviewers commonly press the running device's head against a bathroom or kitchen scale, or a dedicated load cell, and increase pressure until the motor stops moving. Manufacturer-published stall-force figures may use a different, non-disclosed lab methodology, which is one reason this dataset separates manufacturer claims from third-party measurements in its source_class column.
No. Several models in this dataset simply do not publish a stall-force figure at all, and it is not always paired with amplitude and RPM on brand marketing pages the way those two more commonly advertised specs are. That non-disclosure is itself one of this dataset's findings.
Not necessarily. Brands use inconsistent terminology — 'stall force,' 'maximum force,' and 'percussion force' are sometimes used to describe related but not identical measurements. Always check whether a brand defines its force spec explicitly before assuming it means the same thing as another brand's stall-force number.