Weight & Mass Converter

This weight & mass converter covers every common unit used for weight & mass in one place, so instead of hunting for a separate page for each possible pair, you can pick any two units from the dropdowns and get an instant, accurate result. Whether you're converting between metric and imperial systems, or between two units from the same system, the calculator below handles the full range.

Units supported

You can convert freely between: Milligrams, Grams, Kilograms, Metric Tons, Pounds, Ounces, Stones, US Tons. Pick any unit as your starting point and any other as the target — the tool recalculates immediately as you type or change a dropdown.

How the conversion works

Weight & Mass conversions all boil down to multiplying by a fixed ratio: your starting value is first converted into a shared base unit for weight & mass, and then converted out of that base unit into whatever unit you've chosen as the target. Because these ratios are fixed by international standards, the same calculation always produces the same result, whether you do it here or work it out by hand from a reference table.

When you'd use this

• Comparing specifications, recipes, or manuals that use a different unit system than you're used to
• Homework, coursework, or professional calculations that involve weight & mass
• Quickly sanity-checking a number before you order materials, book travel, or fill in a form
• Converting a batch of values without re-deriving the formula from scratch each time

Accuracy and rounding

This converter uses standard, internationally recognized conversion factors for weight & mass, so results are accurate for everyday, academic, and most professional purposes. Values are rounded for readability; if your work requires extra decimal precision, carry a couple more digits through your own calculation rather than relying solely on the rounded display.

Because everything runs locally in your browser, results appear instantly and nothing you type is ever sent to a server or stored.

Bookmark this page if you expect to make this kind of conversion regularly — it loads fast and works the same way every time.

Having one flexible converter that covers every unit in the category, rather than a separate page for each pair, means you can jump between any two units without hunting for the right page.

This kind of conversion shows up constantly in cooking, travel, engineering, coursework, and everyday shopping, which is exactly why a single dependable calculator is worth keeping handy.

Frequently asked questions