Weight Converter — Free Online Tool
Convert kg, pounds, ounces, grams, stones & tonnes. · No signup · Works on mobile
100% private: your data is processed in your browser. Nothing is uploaded to our servers.
How to use the weight converter
-
1
Enter your weight value.
-
2
Pick the source unit (e.g. pounds) and the target unit (e.g. kilograms).
-
3
Get the converted value instantly, with extra precision shown for cooking amounts.
What does this tool do?
This free weight converter switches between kilograms, pounds, ounces, grams, milligrams, stones, and metric tonnes instantly. Enter a value, choose the from/to units, and get an accurate result plus common real-world reference weights — perfect for cooking, fitness, and shipping.
How does the weight converter work?
All units convert through the kilogram: 1 lb = 0.45359237 kg exactly (international avoirdupois definition), 1 oz = 28.3495 g, 1 stone = 14 lb = 6.35 kg. The tool multiplies through these fixed ratios so results stay exact through any chain of conversions.
Frequently Asked Questions
How do I convert kg to lbs quickly?
Multiply kilograms by 2.2 for a close estimate (exactly 2.20462). So 70 kg ≈ 154 lb. Going back, divide pounds by 2.2: a 180 lb person weighs about 81.6 kg. For gym plates: a 20 kg Olympic bar is 44 lb, and 100 kg on the bar is 220 lb.
What is a stone and who uses it?
A stone is 14 pounds (6.35 kg), used mainly in the UK and Ireland for body weight — someone weighing "11 stone 4" weighs 158 lb or 71.7 kg. This converter accepts stones directly, so you don't need the two-step math through pounds.
Is the weight converter really free?
Yes — 100% free with no hidden charges, trial limits, or premium tiers for core features. You don't need to create an account or enter an email address. The site is supported by non-intrusive display ads, which keeps every tool free for everyone.
Is my data private when using the weight converter?
Completely. The weight converter runs entirely in your browser using JavaScript — nothing you type or upload is sent to our servers. When you close the tab, your data is gone. This makes it safe for confidential documents, financial figures, and personal information.
Does the weight converter work on mobile phones?
Yes. The weight converter is built mobile-first and works on any phone or tablet with a modern browser — iPhone (Safari), Android (Chrome), and everything in between. The layout adapts to small screens, so buttons and inputs stay easy to tap on a 375px-wide display.
Do I need to install anything to use the weight converter?
No. The weight converter works directly in your web browser — no downloads, no extensions, no signup. Just open the page, use the tool, and get your result instantly. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.