Use the Feet & Inches Calculator
Free feet-and-inches calculator: add, subtract, multiply and divide lengths, round to 1/16, 1/32 or 1/64, convert to decimal inches, feet and millimetres.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
See it in action
Sample input: Type a calculation (feet, inches, fractions) = 5'-6 1/2" + 3'-2 3/4". Pressed Expression calculator.
What is the Feet & Inches Calculator?
Working with a tape measure means working with feet, inches and fractions, and ordinary calculators make that painful. This calculator lets you type measurements exactly as you read them — 5′-6 1/2″, 5′ 6-1/2″, 5ft 6in, 66.5″, 5.5′ or 3/4″ — and combine them with + , − , × and ÷: add a list of lengths, subtract a cut, multiply by a count, divide by a number, or divide one length by another to get a ratio. The result is shown in feet-and-inches rounded to the nearest 1/2, 1/4, 1/8, 1/16, 1/32 or 1/64 inch, with the rounding error, plus decimal inches, decimal feet, millimetres and metres. Multiplying two lengths gives an area in square feet.
A second tab divides a total length into equal spaces — for example a 10′-3 1/2″ span into seven equal spaces for balusters, studs or deck boards — and lists every mark, or computes the equal gap between posts or boards of a known width, which is the classic fence and baluster layout problem. Everything runs in your browser.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Type 5′-6 1/2″, 66.5″ or 5ft 6in just like on a plan.
Add, subtract, multiply, divide, ratios and areas.
Nearest 1/2″ to 1/64″ with the error shown.
Divide a span or find the gap between posts and boards.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This engineering calculator | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
Which formats can I type?
Feet and inches with fractions, decimal inches or feet, and ft/in words.
Can it divide into equal spaces?
Yes — on the second tab.
Does it handle metric?
It shows mm and m for every result.
Is it free?
Yes.
How do I use the Feet & Inches Calculator?
1. Type a calculation or choose an example chip. 2. Pick the fraction precision. 3. Read the result in feet-inches, decimal and metric. 4. Use the second tab to divide a length into equal spaces.
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