Weight Converter
Convert between pounds, kilograms, ounces, grams, stone, metric tons, and more instantly.
By Drew Budwin · Last updated July 2026 · Methodology
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Weight Converter Formula
Weight conversion uses a base-unit factor approach. Each unit has a factor relative to grams, and the result is:
Result = Value x (From Factor / To Factor)
How to Use This Calculator
- Enter the Value you want to convert.
- Select the From unit using the searchable dropdown (type to filter).
- Select the To unit using the searchable dropdown.
- Click Convert (or press Enter) to see the result.
- Use the Swap button to quickly reverse the conversion direction.
Frequently Asked Questions
How many pounds are in a kilogram?
One kilogram equals approximately 2.20462 pounds. Conversely, one pound equals approximately 0.453592 kilograms.
What is a stone in pounds?
One stone equals approximately 14 pounds (exactly 6,350.29 grams). Stone is commonly used in the UK and Ireland for body weight. For other unit conversions, try the length converter or volume converter.
How does this converter handle very large or very small results?
Results smaller than 0.000001 or equal to or greater than 1,000,000,000,000,000 are displayed in scientific notation (e.g., 1E-12) for readability.
What is the difference between mass and weight?
Mass measures the amount of matter in an object (kilograms), while weight is the force of gravity on that mass (newtons). In everyday use, 'weight' usually means mass. This converter handles mass units.
How many grams are in an ounce?
One avoirdupois ounce (the standard ounce used for most goods) equals approximately 28.3495 grams. One troy ounce (used for precious metals) equals approximately 31.1035 grams.
Is this weight converter free to use?
Yes, this converter is completely free. It runs entirely in your browser with no sign-up or download required.
What is the difference between a short ton, a long ton, and a metric ton?
A metric ton (tonne) is exactly 1,000 kg ≈ 2,204.62 lb. A US short ton is 2,000 lb ≈ 907.18 kg. A UK long ton is 2,240 lb ≈ 1,016.05 kg. They differ by up to 10%. Always check which ton a specification uses.
How do I convert pounds and ounces together to kilograms?
Convert each separately and add: multiply pounds by 453.592 and ounces by 28.3495, then sum the grams. For 1 lb 4 oz: 453.592 + (4 × 28.3495) = 567 g. Enter each value here individually and add the gram results.
What is the difference between an avoirdupois ounce and a troy ounce?
Standard goods use avoirdupois ounces (28.3495 g each). Precious metals use troy ounces (31.1035 g each), about 9.7% heavier. Gold prices are always quoted in troy ounces. Entering the wrong type overstates or understates the weight.