Measurement Unit Converter

Build a measurement sheet

1. Choose a measurement type, enter a value, and select the source and destination units. The result updates as you edit.
2. Give the conversion a label if you want, then press Add conversion to sheet. Repeat for the rest of your measurements.
3. Download the rows as CSV or print the sheet. Reset sheet clears the rows and returns to one inch in centimeters.

A worksheet for the whole task

Keep a model’s dimensions, a classroom exercise, or several package measurements in the same list. Each row keeps its original value, both unit names, and the calculation. Remove a mistaken row without losing the rest. The downloaded sheet includes those steps, so someone else can follow your work.

Length and area are separate categories: a square foot is 144 square inches, not 12. Mass ounces are avoirdupois ounces, not troy ounces. Feet and yards use the international foot rather than the retired US survey foot. Negative signed measurements are accepted; physical temperatures below absolute zero are rejected.

Definitions and limits

Conversion definitions follow NIST Handbook 44, Appendix C and NIST SP 811, Appendix B.8. The US liquid gallon is 231 cubic inches, with 128 US fluid ounces per gallon; the Imperial gallon is 4.54609 liters, with 160 Imperial fluid ounces per gallon. The converter derives the corresponding fluid-ounce factors from those definitions rather than treating the two systems as interchangeable.

For temperatures, it converts through kelvin using the offsets and scale factors explained in NIST’s temperature guide. It does not account for thermal expansion, material density, cooking ingredient density, or measurement uncertainty. Use the correct category before adding a row.

Frequently asked questions