Convert between every common weight and mass unit — metric, US and imperial, and the troy units of precious metals. Every factor is the exact legal definition, computed in exact arithmetic and rounded only for display, entirely in your browser.
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- Kilograms to Pounds ConverterConvert kilograms to pounds by multiplying by 2.20462262185 — the exact reciprocal of the defined 0.45359237 kg pound.
- Pounds to Kilograms ConverterConvert pounds to kilograms by multiplying by exactly 0.45359237, the definition of the international pound since 1959.
- Kilograms to Ounces ConverterConvert kilograms to avoirdupois ounces: 1 kg is about 35.2739619496 oz, from the exact 28.349523125 g ounce.
- Ounces to Kilograms ConverterConvert avoirdupois ounces to kilograms by multiplying by exactly 0.028349523125.
- Kilograms to Grams ConverterConvert kilograms to grams by multiplying by exactly 1,000 — a pure decimal shift.
- Grams to Kilograms ConverterConvert grams to kilograms by dividing by exactly 1,000.
- Kilograms to Stones ConverterConvert kilograms to stones: divide by exactly 6.35029318 kg per stone (14 lb).
- Stones to Kilograms ConverterConvert stones to kilograms by multiplying by exactly 6.35029318 — one stone is 14 international pounds.
- Grams to Pounds ConverterConvert grams to pounds by dividing by exactly 453.59237.
- Pounds to Grams ConverterConvert pounds to grams by multiplying by exactly 453.59237 — the 1959 definition of the pound.
- Grams to Ounces ConverterConvert grams to avoirdupois ounces by dividing by exactly 28.349523125.
- Ounces to Grams ConverterConvert ounces to grams by multiplying by exactly 28.349523125.
- Pounds to Ounces ConverterConvert pounds to ounces by multiplying by exactly 16 — an exact relationship, so 1.5 lb is exactly 24 oz.
- Ounces to Pounds ConverterConvert ounces to decimal pounds by dividing by exactly 16.
- Stones to Pounds ConverterConvert stones to pounds by multiplying by exactly 14.
- Pounds to Stones ConverterConvert pounds to decimal stones by dividing by exactly 14.
- Milligrams to Grams ConverterConvert milligrams to grams by dividing by exactly 1,000.
- Grams to Milligrams ConverterConvert grams to milligrams by multiplying by exactly 1,000.
- Micrograms to Milligrams ConverterConvert micrograms (µg or mcg) to milligrams by dividing by exactly 1,000.
- Milligrams to Micrograms ConverterConvert milligrams to micrograms by multiplying by exactly 1,000.
- Micrograms to Grams ConverterConvert micrograms to grams by dividing by exactly 1,000,000.
- Grams to Micrograms ConverterConvert grams to micrograms by multiplying by exactly 1,000,000.
- Centigrams to Grams ConverterConvert centigrams to grams by dividing by exactly 100.
- Grams to Centigrams ConverterConvert grams to centigrams by multiplying by exactly 100.
- Decigrams to Grams ConverterConvert decigrams to grams by dividing by exactly 10 — one decimal place.
- Grams to Decigrams ConverterConvert grams to decigrams by multiplying by exactly 10.
- Decagrams to Grams ConverterConvert decagrams (dag, also spelled dekagrams) to grams by multiplying by exactly 10.
- Grams to Decagrams ConverterConvert grams to decagrams by dividing by exactly 10.
- Hectograms to Kilograms ConverterConvert hectograms to kilograms by dividing by exactly 10.
- Kilograms to Hectograms ConverterConvert kilograms to hectograms by multiplying by exactly 10.
- Metric Tonnes to Kilograms ConverterConvert metric tonnes to kilograms by multiplying by exactly 1,000.
- Kilograms to Metric Tonnes ConverterConvert kilograms to metric tonnes by dividing by exactly 1,000.
- Metric Tonnes to Pounds ConverterConvert metric tonnes to pounds: 1 t is about 2,204.62262185 lb, computed from the exact pound definition.
- Pounds to Metric Tonnes ConverterConvert pounds to metric tonnes by multiplying by exactly 0.00045359237.
- US Tons to Kilograms ConverterConvert US short tons to kilograms: 1 short ton is exactly 907.18474 kg (2,000 lb).
- Kilograms to US Tons ConverterConvert kilograms to US short tons by dividing by exactly 907.18474.
- Long Tons to Kilograms ConverterConvert imperial long tons to kilograms: 1 long ton is exactly 1,016.0469088 kg (2,240 lb).
- Kilograms to Long Tons ConverterConvert kilograms to imperial long tons by dividing by exactly 1,016.0469088.
- US Tons to Metric Tonnes ConverterConvert US short tons to metric tonnes: 1 short ton is exactly 0.90718474 t, about 9.3% lighter than a tonne.
- Metric Tonnes to US Tons ConverterConvert metric tonnes to US short tons: 1 t is about 1.10231131092 short tons.
- Long Tons to Metric Tonnes ConverterConvert imperial long tons to metric tonnes: 1 long ton is exactly 1.0160469088 t — only 1.6% apart, which is why the two are so often silently confused.
- Metric Tonnes to Long Tons ConverterConvert metric tonnes to imperial long tons by dividing by exactly 1.0160469088.
- Short Tons to Long Tons ConverterConvert US short tons to imperial long tons: multiply by exactly 0.892857142857 (2,000/2,240).
- Long Tons to Short Tons ConverterConvert imperial long tons to US short tons: multiply by exactly 1.12 (2,240/2,000).
- Quintals to Kilograms ConverterConvert quintals to kilograms by multiplying by exactly 100.
- Kilograms to Quintals ConverterConvert kilograms to quintals by dividing by exactly 100.
- Quintals to Metric Tonnes ConverterConvert quintals to metric tonnes by dividing by exactly 10.
- Metric Tonnes to Quintals ConverterConvert metric tonnes to quintals by multiplying by exactly 10.
- Carats to Grams ConverterConvert carats to grams: 1 carat is exactly 0.2 g by the 1907 metric-carat definition, so 5 ct is exactly 1 g.
- Grams to Carats ConverterConvert grams to carats by multiplying by exactly 5.
- Carats to Milligrams ConverterConvert carats to milligrams: 1 ct is exactly 200 mg.
- Milligrams to Carats ConverterConvert milligrams to carats by dividing by exactly 200.
- Troy Ounces to Grams ConverterConvert troy ounces to grams: 1 oz t is exactly 31.1034768 g — about 10% heavier than the kitchen ounce.
- Grams to Troy Ounces ConverterConvert grams to troy ounces by dividing by exactly 31.1034768.
- Troy Ounces to Kilograms ConverterConvert troy ounces to kilograms by multiplying by exactly 0.0311034768.
- Kilograms to Troy Ounces ConverterConvert kilograms to troy ounces by dividing by exactly 0.0311034768 — 1 kg is about 32.1507 oz t, the figure behind kilobar pricing.
- Troy Pounds to Grams ConverterConvert troy pounds to grams: 1 lb t is exactly 373.2417216 g (12 troy ounces) — lighter than the everyday 453.6 g pound, the reverse of the ounce situation.
- Grams to Troy Pounds ConverterConvert grams to troy pounds by dividing by exactly 373.2417216.
- Pennyweights to Grams ConverterConvert pennyweights to grams: 1 dwt is exactly 1.55517384 g (a twentieth of a troy ounce).
- Grams to Pennyweights ConverterConvert grams to pennyweights by dividing by exactly 1.55517384.
- Grains to Milligrams ConverterConvert grains to milligrams: 1 grain is exactly 64.79891 mg, defined as 1/7,000 of a pound.
- Milligrams to Grains ConverterConvert milligrams to grains by dividing by exactly 64.79891.
- Grains to Grams ConverterConvert grains to grams by multiplying by exactly 0.06479891.
- Grams to Grains ConverterConvert grams to grains by dividing by exactly 0.06479891 — 1 g is about 15.43 grains.
- Slugs to Kilograms ConverterConvert slugs to kilograms: 1 slug is approximately 14.59390294 kg.
- Kilograms to Slugs ConverterConvert kilograms to slugs by dividing by approximately 14.59390294.
- Kilograms to Stones and Pounds ConverterConvert kilograms to the UK body-weight form of whole stones plus pounds: 70 kg is 11 st 0.3 lb.
- Stones and Pounds to Kilograms ConverterConvert a weight given as stones and pounds — 11 st 4 lb — to kilograms, using the exact 6.35029318 kg stone.
- Kilograms to Pounds and Ounces ConverterConvert kilograms to pounds and ounces — the format of US birth weights and package labels.
- Pounds and Ounces to Kilograms ConverterConvert a weight in pounds and ounces — 7 lb 11 oz — straight to kilograms.
- Pounds to Stones and Pounds ConverterConvert decimal pounds to whole stones plus remaining pounds: 154 lb is exactly 11 st 0 lb.
- Ounces to Pounds and Ounces ConverterConvert a count of ounces to pounds and ounces: 24 oz is exactly 1 lb 8 oz.
- Weight ConverterConvert between the eleven everyday weight units — micrograms to long tons — in one place.
- Mass ConverterConvert between scientific and everyday mass units, including the slug and the atomic mass unit.
- Metric Weight ConverterConvert along the full metric ladder from micrograms to tonnes.
- Imperial Weight ConverterConvert between the imperial and US customary weight chain: grains, drams, ounces, pounds, stones, hundredweights and tons, with the US/UK differences made explicit.
- Hundredweight to Pounds ConverterConvert hundredweight to pounds — both kinds.
- Hundredweight to Kilograms ConverterConvert hundredweight to kilograms: exactly 45.359237 kg for the US cwt, exactly 50.80234544 kg for the imperial cwt.
- Weight Conversion ChartPrintable reference charts for the conversions people actually look up: kg to lb and st, lb to kg, g to oz and oz to g, at practical precision, with a CSV download of the lot.
- Weight Conversion Table GeneratorBuild a custom conversion table between any two weight units — choose the start value, step and length, then copy it, download it as CSV or print it.
No tools match thatTry a shorter word, or a different spelling.
Frequently asked questions
Are these conversions exact?
Wherever the units allow it, yes. Almost every weight unit is defined as an exact decimal multiple of the kilogram — the pound is exactly 0.45359237 kg, the stone exactly 14 lb, the carat exactly 0.2 g — and the tools compute in exact decimal arithmetic, rounding only for display. The two exceptions, the slug and the atomic mass unit, are measured constants and their pages say so.
Which converter should I start with?
The Weight Converter handles any pair of everyday units in one tool. The dedicated pages — kilograms to pounds, grams to ounces and the rest — add the formula, worked examples and a common-value table for that specific direction, which is faster when you keep making the same conversion.
What is the difference between mass and weight?
Mass is the amount of matter; weight is the force gravity exerts on it. All of these tools convert mass — that is why none of them asks where you are. Your bathroom scale estimates mass by measuring force and assuming Earth gravity, which is fine everywhere you are likely to stand.
Why are there separate tools for troy ounces and carats?
Because they are different units that share names with everyday ones. A troy ounce (31.103 g) is about 10% heavier than a kitchen ounce (28.350 g); a carat is 0.2 g and measures gemstones, while the similar-sounding karat measures gold purity and is not a weight at all. Separate pages keep the confusable pairs impossible to mix up.
Do the tools work offline or upload my numbers?
Every conversion runs in your browser: nothing you type is sent to a server, and once a page has loaded, the arithmetic itself needs no connection. That is also why results appear instantly.
Which ton do you mean — US, UK or metric?
All three exist here as distinct units: the US short ton (2,000 lb), the imperial long ton (2,240 lb) and the metric tonne (1,000 kg). Each pairing has its own converter, and the multi-unit tools list them separately so the word "ton" can never silently change meaning mid-conversion.
Can I download or print a conversion table?
Yes. Every converter ships a common-value table with CSV download, the Weight Conversion Chart page collects printable reference tables, and the Table Generator builds a custom one — your range, your step, your units.
