Mass Converter
Convert between metric, carats, and grains.
⚖️ Precise mass units including carats (for gemstones) and grains (for ammunition/medicine).
What Is This Tool?
This tool converts between precise mass units — including carats (for gemstones and jewelry) and grains (for ammunition and historical medicine doses). Different from weight, which is technically a force.
Key Conversions
- 1 carat = 200 mg = 0.2 g (standard for diamonds and gems)
- 1 grain = 64.7989 mg (used in bullets and old pharmacy doses)
- 1 gram = 5 carats = 15.4324 grains
Why So Many Units
Different fields standardized on different bases historically. Jewelers use carats, ammo reloaders use grains, scientists use grams. This tool unifies them.
Frequently Asked Questions
Carat vs. karat?
Carat (ct) measures gemstone mass = 200 mg. Karat (K) measures gold purity — 24K is pure gold. Same word origin, different meanings today.
About the Mass Converter
The Mass Converter converts mass converterfrom one unit to another using the exact internationally defined conversion factors. Type a value, choose your source and target units, and the converted result is shown instantly — no waiting, no page reload.
Manual conversion is error-prone because it means memorizing ratios (how many feet in a meter, how many pints in a liter). This tool removes that friction: the conversion factor is built in, and the math is done to full precision with no rounding until the final displayed number.
How to Use This Tool
- Enter the value you want to convert in the input field.
- Select the unit you are converting from.
- Select the unit you want to convert to.
- The converted value appears instantly. Adjust either unit to compare across the board.
- Copy the result if you need it elsewhere. Your input is never sent anywhere.
Why Use an Online Converter?
Browser-based tools like this one have a few real advantages over installed software or manual methods:
- No installation. It opens instantly in any browser, on any operating system.
- Private by default. Everything runs locally, so your data stays on your device.
- Always up to date.There's nothing to update — you always get the latest version when you load the page.
- Free and unlimited. Use it as often as you like, with no account and no caps.
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