Weight / Mass Converter
Convert between grams, kilograms, pounds, ounces, stones, and tons instantly.
- Free, no account
- No watermark
- No usage limit
About the Weight Converter
Most weight converters make you pick two units, what you have and what you want, then hand back one number. Need that same weight in a third unit? Do it again. This one throws out the second dropdown, because making you re-pick units for every single answer is busywork. Tell it what you're holding, say 70 kilograms, and it fills in every unit at once, from milligrams to US short tons with grams, kilograms, tonnes, ounces, pounds and stones in between, all live as you type. Copy any single row with one click, or grab a shareable link that carries your number with it. The math runs in your browser, so there's no sign-up and nothing gets uploaded.
How to use
- Type your number into the Value box. Whole or decimal, tiny or huge, all fine.
- Pick what unit that number is in from the From dropdown. It defaults to kilograms.
- Read the answers off the table. Every unit is listed with your value already converted, and the row you started from is highlighted so you can see where you began.
- Hit copy on any row to put just that number on your clipboard, or click Copy shareable link for a URL with your value and unit baked in.
Leave the box empty or type something that isn't a number and you'll see a dash, not an error.
The shareable link, and why it's the useful bit
When you copy the shareable link, your value and starting unit ride along inside the address (something like weight-converter?v=70&u=kg). Open that link, or send it to someone, and the tool loads already showing 70 kg spread across every unit, with nothing to retype. Handy for a recipe you convert every week, a shipping weight you keep re-checking, or pasting "here's 15 stone in kilos" into a message so the other person sees the whole breakdown instead of one number they have to take on faith.
The all-units table pays off the same way. Weighing a bag against an airline limit? You probably care about kilograms and pounds together, because the airline prints both. Convert once, read both. Running kg to lb, then kg to oz, then kg to stone as three separate lookups is exactly the annoyance this removes.
Kilograms to pounds, and a trick for doing it in your head
The conversion nearly everyone actually needs is kilograms to pounds. One kilogram is 2.2046 pounds, and that number isn't something anyone measured on a scale, it's fixed by definition: a pound is exactly 0.45359237 kilograms, so the factor never drifts and never gets "updated." The tool carries the full precision, but away from it there's a shortcut that gets you within a whisker. Double the kilograms and add ten percent. 70 kg becomes 140, plus 14, so 154 lb. The exact answer is 154.32, close enough for luggage or gym plates. Going the other way, halve the pounds and knock off a tenth: 180 lb is 90 minus 9, about 81 kg.
The one place that shortcut bites is dosing. Medicines for kids and animals are prescribed per kilogram of body weight, and a two percent miss on a weight-based dose actually matters clinically. For anything medical, read the exact figure off the tool and don't round it in your head.
Same word, different weight
A few units share a name without sharing a weight, and that's precisely where a converter that lists them side by side saves you.
The two tons catch people out constantly. A metric tonne is 1,000 kg, about 2,204 pounds. A US ton, the short ton, is 2,000 pounds, roughly 907 kg, so it lands about ten percent lighter. On a freight quote or a scrap price that gap is real money. The tool keeps tonne and US short ton as separate rows, so you read both against your number rather than guessing which "ton" a document meant. (There's an old UK long ton of 2,240 pounds too, mostly retired now.)
The ounce has the same trap. The ounce you weigh food and letters in is the avoirdupois ounce, 28.35 grams. Gold, silver and platinum get sold by the troy ounce, which is heavier at about 31.1 grams, roughly ten percent more. So a one-ounce gold coin weighs about 31.1 g, not 28.3 g, and at bullion prices that difference is money. This tool uses the everyday avoirdupois ounce, right for cooking and shipping. If you're pricing precious metals, confirm your source means troy, because this converter won't switch to it for you.
Frequently asked questions
Why show every unit instead of letting me pick a "to" unit?
Because most of the time one answer isn't enough, and locking in a single target unit hides the rest. Showing them all means a weight you'd otherwise convert two or three times is done in one pass. When you genuinely want just one line, the copy button on that row hands you exactly that number and nothing else.
What is a stone, and how do I read "12 stone 8"?
A stone is exactly 14 pounds, about 6.35 kg, still standard in the UK and Ireland for body weight. The trick is that the leftover pounds sit outside the stones, not inside them. "12 stone 8" means 12 times 14 plus 8, which is 176 pounds, not 128. Type a weight in kilograms or pounds and the tool shows the stone figure directly, so you never juggle the fourteens by hand.
What's the difference between mass and weight?
Mass is how much matter something contains, weight is the force gravity puts on that mass. Kilograms and pounds are technically mass units, and the real unit of weight is the newton. On Earth the two track each other closely enough that scales, shops and airlines treat them as identical, which is why this tool converts freely between all of them. You'd only need the distinction for a physics problem, and that's a gravity calculation, not a unit swap.
How precise are the numbers?
Each unit is defined against the gram using its exact factor, and the tool rounds only when it prints the result, so you get eight significant figures. That's far past anything cooking, shipping, science or school will ask of it. Results that get very large or very small switch to scientific notation so they stay readable rather than turning into a wall of zeros.
Can I get kilograms as pounds and ounces together?
The table gives you decimal pounds, so finish it with one small step: keep the whole pounds, then multiply the decimal part by 16 for the ounces. 3.5 kg reads as 7.716 lb, so keep the 7, take 0.716 times 16, about 11, and you've got 7 lb 11 oz. That's the exact move hospitals in metric countries use to read a newborn's weight out to families who think in pounds and ounces.
The link I shared shows the wrong weight. What happened?
A shareable link stores whatever value and unit were set at the moment you copied it. If you changed the number afterward and pasted an older link, or trimmed the end off the URL, the value or unit drops out and the page falls back to its default. Set the number you actually want first, then copy a fresh link.
Does grams-to-cups work here?
No, and that's deliberate. Volume to weight depends on what you're weighing, since a cup of flour and a cup of honey are nowhere near the same weight. That needs a density figure for each ingredient, not a fixed factor, so a kitchen scale beats any converter for baking. This tool sticks to weight-to-weight, where every factor is exact.