Acceleration shows up as meters per second squared on a homework printout, feet per second squared on an old imperial handout, and plain "g" on a crash-test sticker. They measure the same kind of change—how fast speed itself is changing—but the numbers look nothing alike until you convert. The form above is the quick bridge: value in, units chosen, result copied into the lab write-up or the comparison table.
Do not route speed through this page. Miles per hour and meters per second belong on a speed conversion—velocity is a different dimension from acceleration, and mixing them is how spreadsheets get an extra factor of time hidden in the wrong column.
Earth gravity is the mental anchor most people use. Standard surface gravity is about 9.8 m/s², which is roughly one g. Checking that relationship once saves arguments in intro physics labs: 9.8 m/s² expressed as g-force should land near 1, not 9.8.
Imperial sheets and vehicle-adjacent specs
American notes still quote ft/s² in some dynamics tables. A dozen m/s² is a modest bump in metric thinking—about what you feel when a city bus leaves a stop. The same value in feet per second squared is the sort of thing you want to line up before comparing to a column labeled ft/s²: 12 m/s² in ft/s² is a common sanity pass when the default form values already look familiar.
Marketing sometimes talks about zero-to-sixty time instead of peak acceleration. That is a time-and-speed story, not a direct substitute for g—but when a white paper does list peak g, convert it once and keep the original label beside the number so nobody confuses duration with peak load.
Signs, rounding, and swapped units
Braking and deceleration can be written as negative acceleration in math class and as positive "deceleration" in prose. This converter handles the magnitude you type; your coordinate system still decides the sign in the diagram.
Swap from/to if you picked the comparison backwards. Round for the slide, not twice in a chain—convert the authoritative spec value once, then format.
- Confirm the source column is acceleration, not speed or force.
- 1 g ≈ 9.8 m/s² for quick checks; exact constants vary by problem set.
- Paste both the original figure and the converted one in shared docs.
For cross-checking motion problems that also mix distance and time, the speed–time–distance habit note keeps the three variables straight. The unit conversion checklist is still the wider habit—name the dimension before you multiply.
Reference conversions for homework and rough engineering comparisons, not certified safety testing. When the number feeds a real decision, keep the unit label with the value.