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Weight Converter

A kilogram is about 2.2 pounds, and mixing up the two is the classic metric-versus-US mistake on scales, shipping labels, and gym plates. This converter handles kilograms, grams, milligrams, pounds, ounces, stones, and metric tons, with one pound taken as 0.45359 kilograms.

In Grams
1,000g
1 kg = 1,000 g
1 kg = 1,000 g
1,000G
Value
From
To
Exact by definition
The pound is defined as exactly 0.45359237 kg, so the kilogram-to-pound conversions here are exact rather than rounded.
Not all ounces are equal
This uses the avoirdupois ounce (28.35 g). Gold and silver are weighed in troy ounces (31.1 g), so a precious-metal quote won't line up with these figures.
All units
Kilograms1
Grams1,000
Milligrams1,000,000
Pounds2.2046
Ounces35.274
Metric tons0.001
Stones0.1575
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Uses your inputs above
1,000 in grams. Want to try a variation?

The math

Reviewed 2026
Formula
Multiply or divide by the conversion factor to a base unit.

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Example: how weight is calculated

Step-by-step with default inputs

Suppose you put the default values into Weight Converter:

Value
1
From
Kilograms
To
Grams

Plug those into the formula Multiply or divide by the conversion factor to a base unit. and the result is:

In Grams
1,000g
Weight units and their conversion factors
UnitSymbolIn kilograms
Kilogramskg1
Gramsg0.001
Milligramsmg0.000001
Poundslb0.4536
Ouncesoz0.02835
Metric tonst1,000
Stonesst6.3503

Source: NIST official conversions

How does the weight converter work?

Weight Converter uses the formula shown in the math card and cites NIST official conversions. Inputs are validated for sensible ranges; results are computed client-side for instant feedback and do not leave your browser.

References: NIST official conversions.

Last reviewed July 2, 2026 · Editorial policy

Frequently asked questions

How many pounds is 1 kilogram?

About 2.2046 pounds. With one pound taken as 0.45359 kilograms, one kilogram works out to 1 divided by 0.45359, or about 2.2046 pounds.

How many pounds are in a stone?

14 pounds. The stone, still used for body weight in the UK and Ireland, is defined as 14 pounds, or about 6.35 kilograms.

How many grams are in an ounce?

About 28.35 grams. The avoirdupois ounce is one sixteenth of a pound, which puts it at 28.3495 grams.

How accurate is this weight calculator?

The math is deterministic — the same inputs always produce the same output, and the formula is shown above. Accuracy of the answer for your situation depends on how well your inputs match reality and how well the formula models the question.

Why does Google show a slightly different conversion?

For most units the answer is identical to many decimal places. Differences usually come from currency rates (which fluctuate intraday — this tool shows the ECB's daily reference rates) or rounding. We display up to 4 decimals.

How do I share my result?

Hit Share at the top of the page. Every input you change is encoded in the URL, so a permalink reproduces exactly what you see. No account needed.