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Feet to metres, for aviation altitudes into metric airspace, dive tables, running tracks, and any imperial dimension that has to be built or ordered in metric. The factor is exact: 0.3048 metres to the foot, fixed by international agreement in 1959.
Frequently asked questions
What's the formula for feet to metres?
Multiply by 0.3048. So 6 ft = 1.8288 m and 100 ft = 30.48 m. For a mental estimate, divide by 3 and take off about 2%.
Why is the factor exactly 0.3048?
The 1959 international yard and pound agreement redefined the yard as exactly 0.9144 metres to stop the US, UK and Commonwealth definitions drifting apart. A foot is a third of that — 0.3048 m exactly — so the conversion carries no rounding error at all.