Feet and Inches Calculator
Convert feet plus inches to decimal feet, total inches, centimeters, and meters. Split total inches into feet and leftover inches. Add or subtract two lengths. No adult-height 9 ft cap. Construction helper, not a growth chart.
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How to work with feet and inches
- Choose convert to decimal, split from total inches, add, or subtract.
- For to decimal, enter feet and leftover inches (inches may be 12 or more).
- For from inches, enter the total inches field only.
- For add or subtract, enter length A and length B as feet plus inches, then read the result.
Construction feet and inches
Imperial length helper without height cap
| Total inches | feet × 12 + inches |
|---|---|
| Decimal feet | total inches / 12 |
| To cm | total inches × 2.54 |
| Add / subtract | Convert A and B to inches, then combine |
| Height converter difference | No 9 ft adult-height cap on this page |
| Upload | None. Runs in this browser |
What this feet and inches page covers
Construction lengths often mix feet and leftover inches. This page converts, splits, adds, and subtracts those pairs. Human height with a 9 ft cap sits on height. Generic SI length sits on length. Perimeter sums sit on linear feet.
How lengths are computed
totalIn = feet × 12 + inches. Decimal feet = totalIn / 12. Centimeters = totalIn × 2.54. From inches folds total inches into feet plus leftover inches. Add and subtract work on inch totals of A and B.
Why no 9 ft height cap
The height converter rejects very tall typos for people. Lumber, walls, and spans routinely exceed 9 ft, so this construction helper does not apply that cap. Inches to cm alone sits on inches to cm.
Use cases
Turn 12 ft 6 in into decimal feet for a spreadsheet. Add two cut lengths. Split 150 inches into feet and leftover inches. Not a growth chart.
Limits
No fractional-inch markup language and no architectural scale. Construction length helper only. See the disclaimer. Nothing is uploaded.