How to use this calculator
- Enter your own values in the labeled fields. Check the units and assumptions before comparing results. Only the fields needed for your selected calculation mode are shown.
- Your answer updates automatically. Review the calculation steps to see exactly how it was calculated.
- Copy, share, save, or download your result. Saved inputs stay on this device.
How the calculation works
Commonly called a weight converter, this tool converts units of mass. One avoirdupois pound equals exactly 0.45359237 kilograms. Ounces here are avoirdupois mass ounces, not fluid ounces or troy ounces.
A worked example
165 lb × 0.45359237 = 74.84274105 kg.
Reading your result
Use the main result together with its units and supporting figures. Display values are rounded; calculations keep their underlying precision. A change in inputs or assumptions can change the answer. Compare the step-by-step working with your intended use before relying on an estimate.
Frequently asked questions
Are these fluid ounces?
No. Fluid ounces measure volume and require a separate conversion.
Does t mean a US ton?
No. Here t means a metric tonne, equal to 1,000 kilograms.
Sources & methodology
This calculator uses the mathematical identity and assumptions stated above. No current rates, prices, or external data are loaded. Conversion tools use international unit definitions.
Formula review: October 24, 2026. Read our methodology.