Engineering tool
Engineering unit converter
Convert between SI and imperial units commonly found in drawings, test procedures and certificates.
Inputs
Result
Enable JavaScript to use this calculator. The method and formulas are explained below.
Conversion factors
Factors are based on exact definitions where they exist (1 in = 25.4 mm, 1 lb = 0.45359237 kg, standard gravity 9.80665 m/s²). Pressure in kgf/cm² uses standard gravity. Values are rounded for display.
Use of this toolThis calculator is an educational aid. It is not a substitute for the governing standard, the customer specification or engineering approval. Verify results before using them for acceptance decisions.