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About this tool
Convert bitcoin to millibitcoin instantly. Free, bidirectional, and fully in-browser.
1 bitcoin equals 1000 millibitcoin — enter any bitcoin value to convert it to millibitcoin instantly. This Bitcoin to Millibitcoin converter is a client-side tool: it applies a single multiplication (mBTC = BTC × 1000) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert millibitcoin back to bitcoin. A reference table lists common bitcoin values already converted, and nothing you enter is sent to a server.
Open Bitcoin to Millibitcoin Converter on AltFTool — it loads instantly in your browser.
Type the value you want to convert into the Bitcoin field.
Read the equivalent in millibitcoin in the result field, and copy it if needed.
Use the decimal-places slider for more or less precision, or press swap to convert millibitcoin to bitcoin.
The result updates as you type, and the swap button flips the conversion to millibitcoin → bitcoin without reloading.
The conversion uses the precise factor (mBTC = BTC × 1000), so the number matches a manual calculation to the decimal places you choose.
A slider sets 0–10 decimal places, and very small or very large results switch to scientific notation instead of rounding to zero.
Everything runs locally in your browser — no upload, no account, no limit on conversions.
One bitcoin is 1000 millibitcoin. Multiply the bitcoin value by 1000 to convert. For example, 10 BTC = 10000 mBTC.
mBTC = BTC × 1000. This tool applies it automatically and shows a worked example: 10 BTC = 10000 mBTC.
Yes. Press the swap button, or type into the millibitcoin field, and the tool converts millibitcoin to bitcoin using the inverse of the same relationship.
It uses the standard Bitcoin denomination definition (mBTC = BTC × 1000), not a rounded approximation, so results are exact to the number of decimal places you select.
Yes. The converter is a browser-side script with no network calls: your values are never uploaded, and once the page has loaded it keeps working without a connection.
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