Measurements & Conversions

Feet to Inches Calculator

Convert feet, including decimal feet, into inches — for setting out from a drawing dimensioned in the other form.

  • Answers as you type
  • Every formula cited
  • Calculated in your browser
SettingsSettings for this calculationUS
Market
Imperial · sales tax
The length in feet, decimals included.

Decimal feet is the form this page expects: 8.25 ft, not 8 ft 3 in. If you have feet and inches, divide the inches by twelve and add — 8 ft 3 in is 8.25. Entering 8.3 for eight foot three is the standard slip and puts you a tenth of an inch out, which is enough to matter on a run of studs and not enough to notice on one.

Length

96 in

High confidence

12 inches to the foot, so feet × 12 = inches. Exact by definition. Decimal feet are tenths; a tape is eighths. Convert before you mark, not after.

Feet entered
8 ft
Inches
96 in
Metres
2.44 m
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • 12 inches to the foot — NIST Handbook 44, Appendix C (units of length)
  • International yard and pound agreement, 1959 — the foot is exactly 0.3048 m

Inputs used

Length (ft)
8

Intermediate steps

Feet entered
8 ft
Inches
96 in
Metres
2.44 m
Final result96 in

Confidence note: 12 inches to the foot, so feet × 12 = inches. Exact by definition. Decimal feet are tenths; a tape is eighths. Convert before you mark, not after.

Add the equipment this sizes

This result is a specification — 96 in — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-12 · v1.0.0

Regulatory standards & verification citations2
  1. 12 inches to the foot — NIST Handbook 44, Appendix C (units of length)
  2. International yard and pound agreement, 1959 — the foot is exactly 0.3048 m
Cite this page

Your workspace

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.

Setting out is where decimal feet stop being convenient. Civil drawings, survey levels and any dimension that came out of a spreadsheet arrive in tenths and hundredths of a foot, and every one of them has to be turned into something a tape can find before it becomes a mark on a piece of timber. The multiplication is trivial; the discipline around it is not, and the help text spends its words on the one slip that produces a wrong answer with no symptom — reading 8 ft 3 in as 8.3 rather than 8.25. The metre row is carried for the case where the drawing is metric and only the tape is imperial, which on a modern site is no longer unusual.

How to calculate feet to inches in 2 steps

  1. Length (ft)The length in feet, decimals included.
  2. LengthThe tool computes the length from those figures and shows the formula, its sources, and a confidence rating alongside it.

Feet to Inches at common values

Page defaults, not your figures above.

Length (ft)Length (in)
112
224
560
10120
20240
50600

Frequently asked questions

How do I enter eight foot three?
As 8.25. Three inches is a quarter of a foot, so the decimal is .25 and not .3 — the single most common error in decimal feet, and worth a moment's care because it is invisible in the answer.
Why convert to inches at all?
Because nearly every setting-out dimension is eventually marked in inches. Stud spacing, fixing centres, rough openings and cut lengths are all called in inches, so a drawing dimension in decimal feet has to become inches before anybody can mark it.
What is a tenth of a foot on a tape?
1.2 inches, which is a little over an inch and an eighth. There is no mark for it on a standard tape, which is the practical reason decimal feet and building work sit awkwardly together and why engineers' tapes graduated in tenths exist as a separate product.
Does this work for lumber lengths?
For the arithmetic, yes. For ordering, remember that nominal lumber lengths are sold in even feet and that the actual piece is usually a fraction over, deliberately, so that a clean end cut still leaves the stated length.
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 — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.