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Weight Converter

Convert kilograms, pounds, ounces and grams.

Best for: Cooking, shipping and parcels, fitness and bodyweight, and reading specs that mix metric and imperial.

Complete guide

Input

From
To
How it's calculated & sources
The Weight Converter uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Mass uses kilogram as the SI base. All factors anchor through kg.

Example

1 kg = 2.2046 lb = 35.274 oz.

Frequently asked questions

Is conversion real-time?+

Yes — values update instantly as you type in either field, with full bidirectional input.

Where does the mass reference come from?+

All factors are SI-anchored using internationally accepted conversions.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Weight?
A weight (mass) converter changes a quantity between grams, kilograms and tonnes and ounces, pounds and stones, using exact factors.
Why does Weight matter?
The same amount of mass in another unit. Strictly this is mass; everyday 'weight' is a force, but the units here are mass units.
How is Weight calculated?
All units map to a base (the kilogram): 1 pound = 0.45359237 kg exactly, 1 ounce = 28.3495 g, 1 stone = 6.35029 kg and 1 tonne = 1000 kg. The conversion is value x from-factor / to-factor.
What are common weight mistakes?
Confusing the ounce (mass) with the fluid ounce (volume).
When should you use the Weight Converter?
Cooking, shipping and parcels, fitness and bodyweight, and reading specs that mix metric and imperial.

What is the Weight Converter?

A weight (mass) converter changes a quantity between grams, kilograms and tonnes and ounces, pounds and stones, using exact factors.

How the Weight Converter works

All units map to a base (the kilogram): 1 pound = 0.45359237 kg exactly, 1 ounce = 28.3495 g, 1 stone = 6.35029 kg and 1 tonne = 1000 kg. The conversion is value x from-factor / to-factor.

Handy mass equivalents

1 kg2.205 lb
1 pound16 oz = 453.6 g
1 stone14 lb = 6.35 kg
1 ounce28.35 g

Common mistakes to avoid

  • Confusing the ounce (mass) with the fluid ounce (volume).
  • Mixing up 'ton' variants: US short ton 907 kg, UK long ton 1016 kg, metric tonne 1000 kg.
  • Treating mass and weight as identical — fine in daily use, wrong in physics.

Keywords: weight, mass.

Sources: NIST — Weights and measures

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Weight Converter free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Weight Converter?+

Weight Converter uses the standard weight formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Weight Converter runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Weight Converter on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Weight Converter on Free Tools Galaxy — Convert kilograms, pounds, ounces and grams. https://freetoolsgalaxy.com/tools/weight-converter
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# Weight Converter — the free tool I keep coming back to

Convert kilograms, pounds, ounces and grams.

Try it: https://freetoolsgalaxy.com/tools/weight-converter
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The fastest way is to use a free in-browser weight converter: https://freetoolsgalaxy.com/tools/weight-converter. Convert kilograms, pounds, ounces and grams.

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