Convert between kilograms, grams, milligrams, pounds, ounces, stone, metric tons, and short tons instantly. Ideal for cooking, fitness, shipping and science.
Select the unit you are converting from in the From dropdown, enter your amount, then choose the target unit in the To dropdown and click Convert. The result shows both the converted value and a plain-language confirmation of the conversion. The calculator handles very large and very small values — from milligrams to metric tons — with 8 significant figures of precision.
Results from this calculator are estimates based on internationally recognized SI and imperial mass conversion factors and are provided for general informational purposes. Rounding, regional standards and manufacturer variations can cause small differences from official or brand-specific figures.
For decisions where precision is critical — engineering, construction or legal contexts — verify results with a qualified professional or an official reference source.
This calculator uses internationally recognized SI and imperial mass conversion factors. The underlying logic was built and manually cross-checked against independent reference calculators and textbook worked examples across dozens of test cases before publication.
Every formula on elCalculador is reviewed by our editorial team for mathematical accuracy, and pages are re-audited whenever a calculator's logic or inputs are updated.