The 3.28 That Shows Up Everywhere
There is only one number hiding behind this page: 3.28084, the number of feet in a meter. It is the same constant that powers meters to feet for length, and because velocity inherits its length factor, it powers m/s-to-ft/s for speed. Learn it once and the whole chain opens: 1 m/s is 3.28 ft/s, 10 m/s is 32.8 ft/s, 26.82 m/s is the famous 88 ft/s of 60 mph. Every time an SI velocity needs to be spoken in the imperial world — a European wind forecast, a metric flow rate, a CFD output — this single multiplier is the translation.
ft/s = m/s × 3.280839895
1 m = 3.28084 ft exactly (reciprocal of 0.3048)
Definitional — from the 1959 agreement, zero uncertainty.
SI Speeds in Imperial Feet
| m/s | ft/s | Context |
|---|---|---|
| 1 m/s | 3.28 ft/s | A gentle walking pace. |
| 8.3 m/s | 27.2 ft/s | Sprint speed — a fast 100 m runner. |
| 10 m/s | 32.8 ft/s | A fresh breeze, Beaufort 5. |
| 26.82 m/s | 88 ft/s | 60 mph — highway cruising. |
| 100 m/s | 328.08 ft/s | Slow jet aircraft near stall. |
The 8.3 m/s row is the human anchor: the world record for 100 m is about 10.4 m/s average — 34 ft/s — so every value in this table can be felt against "how fast a person can run". Wind limits in US construction are written in ft/s precisely because they sit in this range: 27 ft/s (8.2 m/s) is the common crane-operation cutoff, right where the table meets the Beaufort scale. Whether the spec sheet arrived in m/s from Europe or ft/s from the site office, the two meet at this page.
Engineering Context
The reverse direction is ft/s to m/s. The same reciprocal factor threads through the speed hub: m/s to mph and mph to m/s for the road bridge, m/s to km/h / km/h to m/s for the metric road side, and mph to ft/s / ft/s to mph for the imperial pair. The length behind every velocity is meters to feet on the length hub, and the accelerations built from these speeds are force-hub territory. All roads lead to the speed hub.
More: ft/s to m/s · m/s to mph · m/s to km/h · Speed Hub
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Frequently Asked Questions
How do I convert m/s to ft/s?
Multiply by 3.28084: ft/s = m/s × 3.28084. A 10 m/s wind is 10 × 3.28084 = 32.8 ft/s. The factor is the exact reciprocal of 0.3048, since 1 ft = 0.3048 m by the 1959 definition.
What is the wind speed on the Beaufort scale in m/s and ft/s?
A fresh breeze (Beaufort 5) is 8.0–10.7 m/s, which is 26.2–35.1 ft/s; a gale (Beaufort 8) is 17.2–20.7 m/s, or 56.4–67.9 ft/s. Weather services publish m/s or km/h, but US construction safety specs — crane operation, scaffolding — still quote wind limits in ft/s or mph, so the same storm crosses both units.
Why does 3.28 appear in so many conversions?
Because 3.28084 is meters-per-second's footprint in feet — the reciprocal of the 0.3048 m foot. The same number appears in meters-to-feet length conversion (meters to feet) and in m/s-to-ft/s speed conversion, because velocity inherits the length factor. If you know 1 m = 3.28 ft, you know the whole speed chain.
More: ft/s to m/s · m/s to mph · Speed Hub