Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Kilograms
68.0388
Pounds
150.0000
Grams
68038.80
Ounces
2400.000
Stones
10.714
Milligrams
68038800
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter value.
- 2Enter from.
- 3Read your kilograms on the right — it updates as you type.
- 4Hit Share to keep the scenario or send it to someone.
About this calculator
Convert between the most common units of mass.
Worked example
Using the values the calculator loads with:
Inputs
- Value: 150
- From: Pounds
Results
- Kilograms: 68.0388
- Pounds: 150
- Grams: 68,038.8
- Ounces: 2,400
- Stones: 10.714
- Milligrams: 68,038,800
What each field means
Inputs
- Value
- The value used in the calculation. Starts at 150 so you have a working example on load.
- From
- Pick the option that matches your situation — the maths changes per option. Choices: Milligrams, Grams, Kilograms, Ounces, Pounds, Stones.
Results
- Kilograms
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Pounds
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Grams
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Ounces
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Stones
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Milligrams
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the weight / mass converter work?
Convert between the most common units of mass.
What do I need to enter?
2 values: value, and from. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the kilograms result mean?
It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary.
Who is this tool for?
It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Weight Converter. Retrieved from https://www.revenuelab.fyi/toolbox/weight-converter
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/weight-converter" target="_blank" rel="noopener">Weight Converter — RevenueLab</a> (2026).</p>
Source: [Weight Converter — RevenueLab](https://www.revenuelab.fyi/toolbox/weight-converter) (2026).