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Feet to Metres Calculator

Convert feet to metres for metric drawings, structural schedules and material orders.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Length

20 ft

High confidence

1 foot = 0.3048 m exactly, following from the defined inch. Timber and sheet goods come on different modular grids in each system — a converted length rarely matches stock.

Conversion factor applied
1 ft per ft

Structural schedules, drainage runs and setting-out dimensions all cross this boundary when a project spans markets. The factor is exact and follows directly from the defined inch. Where it becomes practical rather than arithmetic is stock length: imperial markets sell timber in eight, ten and twelve foot lengths, metric markets in 2.4, 3.0 and 3.6 metre lengths, and those two grids do not line up. A converted requirement therefore lands between available sizes far more often than not, and the take-off has to be done against whatever grid the supplier actually stocks rather than against the converted figure. On large sites, be aware too that the retired US survey foot differs marginally from the international foot.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • 1 ft = 12 in = 304.8 mm = 0.3048 m exactly

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Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

How do I enter feet and inches together?
Convert the inches to a decimal and add them. Six inches is half a foot, so 20 ft 6 in is 20.5. Three inches is 0.25, nine inches 0.75. For odd values, divide the inches by twelve.
Is a US survey foot different?
Slightly, and it matters on large sites. The survey foot was marginally longer than the international foot and was used in US land surveying until its official retirement. Over a short building dimension the difference is invisible; over thousands of feet it is not.
Why does my timber not match the converted length?
Because timber is sold in nominal lengths on a modular grid — 2.4 m, 3.0 m, 3.6 m in metric markets, 8 ft, 10 ft, 12 ft in imperial ones. Those grids do not align, so a converted requirement usually falls between two available stock lengths.