What this Weight Converter does
This English-language weight converter handles every common unit in one pass: milligrams, grams, kilograms, metric tons, ounces, pounds, and stones. Type any value and all seven conversions appear simultaneously — so a single lookup answers both "kg to lb" and "lb to kg" without reloading or retyping. It's built 100% client-side — your data never leaves your browser. No uploads, no tracking, no server logs. Whether you're reconciling a shipping quote that lists pounds while your scale shows kilos, or reading a UK fitness post that reports body weight in stones, the answer is one input away. If you're also working with distances, our [Length Converter](/en/length-converter/) covers the metric-to-imperial gap for measurements.
Features
- All-at-once conversions. One input renders all 7 unit results simultaneously — no need to run separate kg-to-lb and lb-to-kg queries.
- Stone support. Includes the stone unit (1 st = 14 lb) used widely in UK and Irish body-weight reporting — often missing from US-built converters.
- Metric and imperial in one view. Covers mg, g, kg, metric ton on the metric side and oz, lb, stone on the imperial side — the full everyday weight conversion chart in a single screen.
- Copy any result instantly. Each converted value has a one-click copy button so you can paste directly into a spreadsheet, form, or message without selecting text manually.
- Privacy-first design. Zero server requests. The conversion logic runs entirely in your browser — no input is ever transmitted, stored, or logged anywhere.
- No unit pre-selection required. You don't specify a source unit — enter a number and all outputs appear at once, which is faster when you're not sure which unit a document used.
How to use the Weight Converter
Enter a numeric value in the input field and press Convert. All seven unit results appear immediately.
- Enter your value. Type the numeric weight you want to convert — for example
70for 70 kilograms, or154.3for a decimal pound value. - Press Convert. Click the Convert button (or press Enter). The tool calculates all conversions in one pass using fixed conversion factors.
- Read the results. All seven units — mg, g, kg, metric ton, oz, lb, stone — are displayed together. No need to re-run for a different target unit.
- Copy what you need. Click Copy next to any result to send that value to your clipboard, ready to paste into a shipping form, recipe, or fitness log.
Common use cases
- Fitness and body weight tracking. Convert your body weight from kilograms to pounds for a US gym app, or from stones to kilograms if your doctor abroad needs metric figures. The stone output is particularly useful for anyone following UK fitness communities online.
- International shipping and logistics. Shipping carriers often quote rates in pounds while warehouse scales display kilograms. Paste the kilo figure in once and read the pound equivalent directly — no manual weight conversion table needed.
- Cooking across metric and imperial recipes. A recipe from Dublin may list grams while your US kitchen scale shows ounces. Converting grams into ounces (or vice versa) is a one-second lookup here, and you get every other unit as a bonus.
- Science and lab work. When working with small quantities, milligrams and grams conversions matter. Enter a milligram value and instantly see the gram and kilogram equivalents without a separate grams conversion step.
- Shopping and product specs. Product listings on global marketplaces sometimes mix units. If a Seattle-based retailer lists net weight in pounds but you need kilograms for a customs form, this tool resolves it in one step — and if you also need a price per unit, the [percentage calculator](/en/percentage-calculator/) is nearby.
Frequently asked questions
Is my weight data sent to any server?
No. This tool runs entirely in your browser using JavaScript. No value you enter is transmitted, stored, or logged anywhere. There is no backend — the conversion happens locally the moment you press Convert.
Why does the tool show all units instead of asking me to pick a target?
Most weight lookups involve more than one pair — you might need both lb and stone from the same kg value. Showing all results at once means you answer 'pounds kilograms', 'oz to grams', and 'weight into pounds' in a single interaction rather than repeating the query.
What is the difference between a metric ton and a US ton?
A metric tonne is exactly 1,000 kg (about 2,204.6 lb). The US short ton is 2,000 lb (roughly 907.18 kg) — nearly 10% lighter. This tool uses the metric ton (1,000 kg). If you're working with US freight or agriculture documents, verify which ton definition the source uses.
Why do some weight results look slightly off at many decimal places?
Floating-point arithmetic on computers stores numbers in binary, not decimal. The classic example is that 0.1 + 0.2 evaluates to 0.30000000000000004 in IEEE 754 double-precision. For everyday weight conversion purposes the displayed precision is more than sufficient, but it explains any trailing-digit variation you might notice.
What is a stone, and why does this converter include it?
A stone is a unit of mass equal to 14 pounds (approximately 6.35 kg), still widely used in the UK and Ireland for reporting body weight. Most US-built weight converters omit it, but if you follow UK health, fitness, or diet communities, stone-to-kg conversion is a regular need.
Does this tool handle troy ounces for precious metals?
No. This converter uses the avoirdupois ounce (28.3495 g), which is the everyday standard for food, shipping, and body weight. The troy ounce used in precious metals weighs 31.1035 g — about 10% heavier. For gold or silver calculations you'd need a dedicated precious-metals tool.