About Us

InchCalculators.org is a free library of online calculators and unit converters. We build tools for the measurements and numbers people deal with every day: on the job site, in the classroom, in the kitchen, at the doctor's office and when planning their money.

Our approach

• Show the work. Every calculator explains its formula and includes a worked example.
• Real-world inputs. Enter feet and inches, fractions such as 3 1/4, and mix metric with imperial units.
• Fast and private. Calculations run in your browser. We do not ask you to sign up, and the numbers you type stay on your device.

Accuracy

We test each calculator against known values and published formulas. Results are estimates for planning and learning; for medical, legal, financial or structural decisions, please confirm with a qualified professional.

Found an error or want a new calculator? Let us know.