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Weight & Mass Converter

Convert weight between 12 units with the formula, a reverse conversion and a quick-reference table.

To convert weight, enter a value and pick the units. The result appears instantly with the exact conversion formula, the reverse conversion, a quick-reference table of common values and every one of the 12 supported units. The pound is defined as exactly 0.45359237 kg by the 1959 international yard and pound agreement.

Runs in your browser
Units supported
12
Base unit
kg
Precision
Adjustable from 1 to 15 significant figures
Shows
Formula, reverse conversion and a common-values table
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How accurate is this weight converter?

Conversions use exact SI definitions where one exists and are computed in double-precision floating point. You can raise the displayed precision to 15 significant figures, and the unrounded result is shown separately. The pound is defined as exactly 0.45359237 kg by the 1959 international yard and pound agreement.

Can I reverse the conversion without retyping?

Yes — the swap toggle reverses the two units in place. The reverse rate is also shown in the detail section, so you can read it either way without changing anything.

Is my data sent anywhere?

No. The conversion is plain JavaScript running in your browser. No value you type is transmitted, logged or stored.

Can I link to a specific conversion?

Yes. The URL updates as you type, so you can bookmark or share a link that reopens with exactly the same conversion.

How to use the weight & mass converter

  1. 1Set the value.
  2. 2Choose the from.
  3. 3Choose the to.
  4. 4Turn "Swap direction" on or off as needed.
  5. 5Set the significant figures.
  6. 6The result appears immediately — copy or download it.

Embed this tool

Put the working weight & mass converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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