About this tool
This calculator does arithmetic on imperial feet-and-inches measurements, including fractional inches, and converts the answer to metric. It runs entirely in your browser with nothing uploaded.
Each measurement is converted to a single total in inches using feet × 12 + inches + fraction. Addition and subtraction combine two such lengths; multiplication and division scale one length by a plain number. The result is rounded to the nearest 1/16 inch and normalized back into feet, whole inches and a reduced fraction, so 98 inches becomes 8 ft 2 in. The same total also drives the decimal conversions.
For the metric outputs it uses the exact definitions 1 inch = 2.54 cm = 0.0254 m and decimal feet = total inches ÷ 12. Enter both measurements (or a length and a multiplier), choose the operation, and read the feet-inches answer plus decimal feet, decimal inches, meters and centimeters.