Engineering Tools
Engineering Unit Converter
Convert length, force, stress, moment, mass, density and temperature between SI, metric and US customary units.
For preliminary estimates only. These tools are not structural design or code-compliance checks. Results must be verified by a qualified engineer against the project specification, the applicable standards and the manufacturer's data before use in design, procurement or fabrication.
Enter a value and press Convert.
Assumptions
- Conversions use exact definitions: 1 in = 25.4 mm, 1 lb = 0.45359237 kg, standard gravity g = 9.80665 m/s² (for kgf, tf and lbf).
- 1 kip = 1000 lbf; 1 ksi = 1000 psi; 1 MPa = 1 N/mm²; t = metric tonne (1000 kg); tf = tonne-force.
Units
- SI, metric and US customary units as listed in each quantity.
Limitations
- Results are rounded to 6 significant figures for display.
- Temperature conversion is for absolute temperatures; temperature differences convert by factor only (1 K = 1 °C = 1.8 °F).
Version 1.0 · Formulas checked against hand calculations on 2026-10-18; pending sign-off by a qualified engineer.
Planning a steel structure project?
Share your drawings, location and design standard. Our engineering team will review the scope and respond with the next steps.