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Mass Converter

Convert mass between metric (kg, g, mg, tonne), avoirdupois (lb, oz, stone, short ton, long ton), troy ounce, grain, and the metric carat with NIST-grade exact factors.

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lb

Result

0.453592 kg

1 lb= 0.453592 kg

UnitValue
Milligram (mg)453,592
Gram (g)453.592
Kilogram (kg)0.453592
Tonne (metric ton, 1000 kg) (t)4.53592E-4
Ounce (avoirdupois) (oz)16
Pound (lb, avoirdupois) (lb)1
Stone (st, 14 lb) (st)0.0714286
Short ton (US, 2000 lb) (ton (US))5E-4
Long ton (UK, 2240 lb) (ton (UK))4.46429E-4
Troy ounce (precious metals) (oz t)14.5833
Grain (gr, pharmaceutical) (gr)7,000
Carat (ct, gemstones — not karat / gold purity) (ct)2,267.96

Tracking bodyweight? See body fat percentage and lean mass.

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Mass converter: pounds to kilograms, ounces to grams, and stone.

A mass converter restates a value from one unit into another by scaling every unit through the kilogram. It covers metric, imperial, and specialist units, and keeps look-alike units apart — the grocery ounce (28.3495 g) versus the troy ounce (31.1035 g) used for gold.

What Is a Mass Converter?

1 kilogram is 2.20462 pounds, and 1 pound is 453.592 grams — the two conversions that carry most of the traffic to any mass tool. A mass converter takes a value in one unit and restates it in another, and under the hood it does this by routing everything through a single base unit: the kilogram, which since 2019 has been fixed to the Planck constant rather than a metal cylinder in Paris. Each supported unit stores one factor to the kilogram, so any pair is only two steps apart — scale the input up to kilograms, then scale back down to whatever you asked for.
That one-pivot design is why the same tool handles a grocery ounce, a gym-floor barbell, a gold bar, a diamond, and a shipping container without special cases. The units fall into a few families: metric (milligram, gram, kilogram, tonne), everyday imperial (ounce, pound, stone), the big freight units (short ton, long ton), and the specialist units that share names with everyday ones but mean something different — the troy ounce for precious metals, the grain for pharmacy and ammunition, and the carat for gemstones.
The distinctions that trip people up are all about overloaded names. A grocery (avoirdupois) ounce is 28.3495 grams, but a troy ounce of gold is 31.1035 grams — heavier, and quoted separately in the bullion trade. A stone is exactly 14 pounds (6.35029 kilograms), the unit the UK still uses for body weight. And "ton" means three different masses depending on where the invoice was written: a US short ton is 907.185 kilograms, a metric tonne is 1000 kilograms, and a UK long ton is 1016.05 kilograms. The converter keeps each of these in its own labeled slot, so you are never guessing which ounce or which ton a figure meant.

How to Use the Mass Converter

Using the mass converter takes three steps:
1. Pick the unit you are starting from in the From menu — kilogram, pound, ounce, stone, troy ounce, or any other supported unit.
2. Pick the unit you want in the To menu.
3. Type your value. The result updates as you type, and you can click it to copy.
Either menu switches to any unit in the list at any time, so you set both the from-unit and the to-unit yourself rather than being locked to one default pair. A precision selector lets you keep the automatic setting or fix the number of decimals, which matters when a factor like kilograms-to-pounds runs to many digits.
To run a conversion by hand, scale through the kilogram. Pounds to kilograms: 1 pound is 453.592 grams, so multiply pounds by 0.453592 — 150 pounds is 150 × 0.453592 = 68.0388 kilograms. Kilograms to pounds reverses it: 1 kilogram is 2.20462 pounds, so 70 kilograms is 70 × 2.20462 = 154.3234 pounds. Ounces work the same way: 1 ounce is 28.3495 grams, so 8 ounces is 8 × 28.3495 = 226.796 grams. Whichever pair you choose, it is one scale up to kilograms and one scale back down.
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The Mass Conversion Formula

mt=ms×fs÷ftm_t = m_s × f_s ÷ f_t
  • msm_s = The mass you start from, in the source unit
  • fsf_s = Kilograms in one source unit — its factor to the kilogram (0.453592 for a pound, 0.0283495 for an ounce)
  • ftf_t = Kilograms in one target unit — its factor to the kilogram
  • mtm_t = The converted mass, in the target unit
Every mass conversion is a single multiplication, because all mass units share the same zero: zero of anything is zero kilograms. Give each unit one number — how many kilograms it equals — and any pair of units is two scalings apart. Scale the input up to kilograms with the source factor, then scale back down with the target factor. There is no offset to add, which is what separates a mass conversion from a temperature one.
The metric factors are powers of ten: 1 mg = 0.000001 kg, 1 g = 0.001 kg, and 1 tonne = 1000 kg. The everyday imperial units all hang off one anchor — the pound, fixed at 0.45359237 kg by the 1959 International Yard and Pound Agreement — so an ounce is a pound ÷ 16 (28.3495 g), a stone is 14 pounds (6.35029 kg), a US short ton is 2000 pounds (907.185 kg), and a UK long ton is 2240 pounds (1016.05 kg). The specialist units are defined on their own terms: a troy ounce is 31.1035 g, a metric carat is exactly 0.2 g, and a grain is 64.79891 mg.
Because the pound's kilogram value runs to eight digits, the familiar figures — 1 kg = 2.20462 lb and 1 lb = 453.592 g — are rounded faces of an exact definition, not approximations of an unknown. So the only rounding in a metric-imperial mass conversion is in the decimals you choose to display; raise the precision and the extra digits are already there. Within-system relationships stay clean: 1 stone is exactly 14 pounds, 1 pound is exactly 16 ounces, and every metric step is a plain shift of the decimal point.

Common Mass Conversions

ConversionResultExact?
1 kilogram1000 gramsexact
1 kilogram2.20462 poundsrounded
1 pound453.592 gramsrounded
1 pound16 ouncesexact
1 ounce (avoirdupois)28.3495 gramsrounded
1 troy ounce31.1035 gramsrounded
1 stone14 poundsexact
1 stone6.35029 kilogramsrounded
1 tonne (metric)1000 kilogramsexact
1 short ton (US)907.185 kilogramsrounded
1 long ton (UK)1016.05 kilogramsrounded
1 carat0.2 gramsexact
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Worked Mass Conversions

Your weight: 75 kg in pounds

A body weight of 75 kg is 165.3465 pounds, which most people round to about 165 lb. Multiply kilograms by 2.20462: 75 × 2.20462 = 165.3465 lb. To go back, multiply pounds by 0.453592, so 165 lb returns to 165 × 0.453592 = 74.84 kg — a hair under the original 75, because rounding to a whole 165 lb dropped the fractional part.

US to metric: 180 pounds in kilograms

A load or body weight of 180 lb is 81.6466 kg. Multiply pounds by 0.453592: 180 × 0.453592 = 81.6466 kg, usually shown as 81.6 kg on a metric scale. The reverse multiplies kilograms by 2.20462, so 80 kg is 80 × 2.20462 = 176.37 lb — handy for reading a plate labeled in one system on equipment marked in the other.

Cooking: 8 ounces in grams

A recipe calling for 8 ounces of an ingredient means 226.796 g. Multiply ounces by 28.3495: 8 × 28.3495 = 226.796 g, which most cooks round to 227 g. Because 16 ounces make a pound, 16 × 28.3495 = 453.592 g confirms the familiar 1 lb = 453.592 g. These are avoirdupois (kitchen) ounces, not the troy ounces used for metals.

UK body weight: 12 stone in kilograms

A body weight of 12 stone is 76.2035 kg. Multiply stone by 6.35029: 12 × 6.35029 = 76.2035 kg, or 168 lb (12 × 14). British weights are often written as "11 stone 4," meaning 11 × 14 + 4 = 158 pounds, which converts to 158 × 0.453592 = 71.6675 kg. Convert the whole figure in pounds rather than splitting the stone and the pounds separately.

Precious metals: 10 troy ounces of gold

Ten troy ounces of gold is 311.035 g. Multiply troy ounces by 31.1035: 10 × 31.1035 = 311.035 g. Ten grocery (avoirdupois) ounces of the same metal would be only 283.495 g (10 × 28.3495) — about 27.5 g, or roughly 10%, lighter. That gap is exactly why bullion is always quoted in troy ounces and never in the ounce on a kitchen scale.

Freight: 5 short tons versus 5 tonnes

Five US short tons is 4535.925 kg (5 × 907.185), while five metric tonnes is a round 5000 kg — a gap of 464 kg, close to half a tonne. A UK long ton is heavier still, at 1016.05 kg each. On a cross-border shipping invoice, reading "5 tons" as the wrong standard misstates the load by hundreds of kilograms, so always confirm which ton the paperwork means before you commit.

Common Mass Conversion Mistakes

  • Reading a troy ounce as an ordinary ounce. The ounce on a food label (avoirdupois) is 28.3495 grams, but the ounce a gold or silver price is quoted in (troy) is 31.1035 grams — noticeably heavier. Convert bullion with the grocery ounce and every figure comes out short, so keep the two in their separate slots.
  • Confusing mass with weight. Mass is how much matter something contains and is measured in kilograms; weight is the force gravity pulls on that mass and is measured in newtons. A bathroom scale shows kilograms but is really sensing force, and the same object keeps its kilograms on the Moon while its weight drops. This tool converts mass — for the force side, use a force converter.
  • Treating every "ton" as the same. Three different masses share the name: a US short ton is 907.185 kilograms, a metric tonne is 1000 kilograms, and a UK long ton is 1016.05 kilograms. That spread is wide enough to matter on any shipping invoice or crane rating, so an unlabeled "ton" on a cross-border document should always be pinned down.
  • Forgetting a stone is 14 pounds. A stone is exactly 14 pounds (6.35029 kilograms), not 10, and British body weights are often written as "11 stone 4," meaning 11 × 14 + 4 = 158 pounds. Split it with the wrong factor and the height-and-weight math falls apart.
  • Mixing up carat and karat. A carat (ct) is a unit of mass — exactly 0.2 grams — used to weigh gemstones, so a 2-carat diamond weighs 0.4 g. A karat (K), spelled with a k, is not a mass at all: it measures gold purity out of 24, so 18K gold is 18/24 = 75% pure. This converter handles the carat of mass; the karat of purity is a ratio, not something you convert between units.
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Mass Converter — Frequently Asked Questions

How many pounds are in a kilogram?

One kilogram is 2.20462 pounds. Going the other way, one pound is 0.453592 kilograms — so multiply pounds by 0.453592 for kilograms, or kilograms by 2.20462 for pounds.

How do I convert pounds to kilograms?

Multiply the pounds by 0.453592, since 1 pound is 453.592 grams. So 150 pounds is 150 × 0.453592 = 68.0388 kilograms, and 180 pounds works out to about 81.6466 kilograms. The 0.453592 factor is the internationally agreed one.

How many ounces are in a pound?

There are 16 ounces in a pound. Each avoirdupois ounce is 28.3495 grams, so 16 × 28.3495 = 453.592 grams, the weight of one pound. This is the kitchen and grocery ounce, not the troy ounce used for metals.

What is the difference between a troy ounce and a regular ounce?

A regular (avoirdupois) ounce is 28.3495 grams and is what food labels, postage, and kitchen scales use. A troy ounce is 31.1035 grams and applies only to precious metals — gold, silver, platinum, palladium. The troy ounce is the heavier of the two, which is why bullion figures never use the grocery ounce.

How many grams are in an ounce?

One ounce is 28.3495 grams — the avoirdupois ounce used in cooking, groceries, and postage. Most recipes round it to 28.35 grams. Do not confuse it with the troy ounce (31.1035 grams), which applies only to precious metals.

What is a stone in pounds and kilograms?

A stone is exactly 14 pounds, which is 6.35029 kilograms. The UK and Ireland still use it for body weight, so "11 stone 4" means 11 × 14 + 4 = 158 pounds.

How do I convert kilograms to stone?

Divide the kilograms by 6.35029, since one stone is 6.35029 kilograms. So 80 kg ÷ 6.35029 = 12.5978 stone, which reads as 12 stone 8 pounds (0.5978 × 14 ≈ 8.4 lb). The UK and Ireland use stone for body weight, and results are usually spoken as stone-and-pounds rather than a decimal.

How many grams are in a kilogram?

There are exactly 1000 grams in a kilogram, and 1000 milligrams in a gram. The metric units step by powers of ten, so converting between them just moves the decimal point — no rounding is involved.

What is the difference between a short ton, a long ton, and a tonne?

All three go by "ton" but weigh different amounts. A US short ton is 907.185 kilograms, a metric tonne is 1000 kilograms, and a UK long ton is 1016.05 kilograms. They differ enough that an unlabeled ton on an international invoice is genuinely ambiguous and worth confirming.

Which "ton" should I use on a shipping document?

Match the standard of wherever the document is used. Inside the US, an unqualified ton usually means the short ton (907.185 kilograms); in international and EU shipping it means the metric tonne (1000 kilograms); older UK paperwork may mean the long ton (1016.05 kilograms). If it is not stated, convert both plausible readings and confirm before you commit, because the gap can exceed a tenth of the load.

What is the difference between mass and weight?

Mass is the amount of matter in an object, measured in kilograms; weight is the force gravity exerts on it, measured in newtons. Your mass is the same on Earth and the Moon, but your weight is much lower on the Moon. Scales read out kilograms even though they physically measure force. This converter handles mass.

What is a carat, and is it the same as a karat?

A carat is a unit of mass equal to exactly 0.2 grams (200 milligrams), used for gemstones — a 1-carat diamond weighs 0.2 g. A karat, spelled with a k, is different: it measures gold purity out of 24, so 24K is pure gold and 18K is 75% gold. The converter handles carats of mass; karats of purity are a ratio, not a mass unit.

Can I use this for precious-metals conversions?

Yes, for the mass side. The troy ounce sits in its own group at 31.1035 grams, so you can move a gold or silver quantity between troy ounces, grams, and kilograms cleanly. It does not carry spot prices, so pair the converted mass with a live price feed when you are pricing a trade.

How accurate is this mass converter?

It uses the internationally agreed factors: 1 pound is 453.592 grams, 1 kilogram is 2.20462 pounds, 1 stone is 14 pounds, and 1 tonne is 1000 kilograms. The only rounding is in how many decimals you choose to display, which you control with the precision selector — raise it for engineering or metrology work.

Is this mass converter free?

Yes. It runs entirely in your browser with no account and no limits, covering metric units, imperial units, and specialist ones like the troy ounce, grain, and carat. An embeddable version is available too, so fitness, cooking, jewelry, and shipping sites can host it without sending readers off-site.

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