Conversion

Add a list of weights in pounds and ounces to find the combined total, including repeated items.

Convert gallons to cm^3 or cm^3 to gallons using US liquid or Imperial gallon factors, with rounding and mL shown.

Convert cc or cm^3 to gallons, or gallons to cm^3, with US liquid and Imperial gallon options plus the factor used.

Convert cm^3, cc, and liters both ways. Includes smart rounding and an mL check to catch powers-of-10 mistakes.

Convert liters to cubic centimeters or reverse cm^3 to L, with rounding and a milliliter check to catch unit mistakes.

Convert square feet to square millimeters or back, choose rounding, and see the exact squared-unit factor and reverse check.

Convert mm2 to ft2 or ft2 to mm2 with rounding, exact factor, and optional square inch or square meter check.

Convert square inches to square millimeters, reverse the conversion, or use rectangle sides in inches to avoid area mistakes.

Convert square millimeters to square inches with the exact 645.16 mm2 per in2 area conversion factor.

Convert square kilometers to square meters using the exact 1,000,000 multiplier. Enter a number, km^2, or sq km.