Grams Converter
Convert Grams (g) to any other weight & mass unit. The table below gives the exact figure for each unit, and every conversion is worked from the same engine as the converter.
What grams convert to
One g in every other weight & mass unit.
| Unit | 1 g | Reverse |
|---|---|---|
| Milligrams | 1,000 mg | 0.001 g |
| Kilograms | 0.001 kg | 1,000 g |
| Tonnes (metric) | 1e-6 t | 1,000,000 g |
| Ounces | 0.035274 oz | 28.349523 g |
| Pounds | 0.002205 lb | 453.59237 g |
| Stones | 1.5747e-4 st | 6,350.29318 g |
Multiply a grams figure by the figure in the second column to get the unit in the first, or multiply by the third column to go the other way.
Grams conversion reference
Grams to Milligrams
One grams is 1,000 milligrams, and one milligrams is 0.001 grams.
A milligram is one thousandth of a gram. It is used for medicine doses, laboratory work, water-quality readings and any measurement of trace amounts.
- 1 g= 1,000 mg
- 5 g= 5,000 mg
- 10 g= 10,000 mg
Grams to Kilograms
One grams is 0.001 kilograms, and one kilograms is 1,000 grams.
The kilogram is the SI base unit of mass. It is used for body weight, market produce, luggage allowances and cargo, and it is the unit a metric kitchen or market scale shows.
- 1 g= 0.001 kg
- 5 g= 0.005 kg
- 10 g= 0.01 kg
The kilogram is the SI base unit of mass, and every other metric mass unit is defined from it by powers of ten. One kilogram equals 1,000 grams exactly.
Kilograms are the everyday unit for body weight, market produce and cooking quantities, and they set luggage allowances and freight charges on shipping documents and airline tickets.
Grams to Tonnes (metric)
One grams is 1e-6 tonnes (metric), and one tonnes (metric) is 1,000,000 grams.
A metric tonne is 1,000 kilograms. It is used for shipping, freight, harvests and industrial quantities. It is not the same as a US short ton (907.18 kg) or a UK long ton (1,016.05 kg).
- 1 g= 1e-6 t
- 5 g= 5e-6 t
- 10 g= 1e-5 t
Grams to Ounces
One grams is 0.035274 ounces, and one ounces is 28.349523 grams.
An ounce is exactly 28.349523125 grams, one sixteenth of a pound. It is used for food portions and postal weights, and precious metals use the different troy ounce of 31.1035 g.
- 1 g= 0.035274 oz
- 5 g= 0.17637 oz
- 10 g= 0.35274 oz
An ounce is exactly 28.349523125 grams and one sixteenth of a pound, so sixteen ounces make one pound. That definition makes it the avoirdupois ounce, the unit used for ordinary trade.
Ounces appear on postal and courier weight bands, on food packaging and recipe cards, and in the jewellery trade, though precious metals are quoted in the troy ounce.
Grams to Pounds
One grams is 0.002205 pounds, and one pounds is 453.59237 grams.
A pound is exactly 0.45359237 kilograms, or 16 ounces. It is the everyday weight unit in the United States and remains common for body weight and packaged goods elsewhere.
- 1 g= 0.002205 lb
- 5 g= 0.011023 lb
- 10 g= 0.022046 lb
A pound is exactly 0.45359237 kilograms, or 453.59237 grams, and it contains sixteen ounces of 28.349523125 grams each. This is the avoirdupois pound used for general goods.
Pounds are the everyday weight unit in the United States, and they remain common for body weight, packaged food, courier parcels and freight wherever imperial measures are still used.
Grams to Stones
One grams is 1.5747e-4 stones, and one stones is 6,350.29318 grams.
A stone is exactly 14 pounds, or 6.35029318 kilograms. It is used almost exclusively in the UK and Ireland, mainly for body weight.
- 1 g= 1.5747e-4 st
- 5 g= 7.8737e-4 st
- 10 g= 0.001575 st
A stone is exactly 14 pounds, which equals 6.35029318 kilograms, or 6,350.29318 grams. It is a body-weight unit used in the United Kingdom and Ireland, not part of the metric system.
Stones are used almost exclusively for adult body weight, and they appear on bathroom scales and in medical records in the United Kingdom and Ireland. Produce and freight are never sold by the stone.
What grams are used for
A gram is one thousandth of a kilogram. It is used for food portions, recipe ingredients, jewellery and postal items, and it is the unit most kitchen scales show.
A gram is one thousandth of a kilogram, and it is defined through the kilogram, the SI base unit of mass. Metric prefixes scale it by powers of ten.
Grams appear on kitchen scales for food portions and recipe ingredients, on postal and courier labels for small packages, and in jewellery listings where the mass of metal or stones is stated.
Converting grams to kilograms or milligrams is a pure decimal shift and is exact. Imperial factors are exact by definition, but results are rounded for display, so a round trip can differ in the last digit.
A frequent error is reading a jewellery weight given in troy ounces as an avoirdupois ounce, since the troy ounce is 31.1035 grams. Grams suit small quantities, while kilograms suit body weight, market produce and freight.
The nearest sibling to a gram is the kilogram, and kitchen and market scales invite a mix-up; 500 grams is 0.5 kilograms, so a thousandfold slip is easy. Use grams for small portions and kilograms for bulk quantities.
Metric conversions are exact. Results are displayed rounded, so values at the extreme ends of the scale — milligrams and tonnes — carry fewer significant digits than the middle of the range.
Between the metric units a weight conversion is a power of a thousand, so grams to kilograms and kilograms to tonnes are decimal shifts. The imperial units are all defined against the kilogram, which makes every metric-to-imperial pair a multiplication with the same factor at any size.
The dimension where this goes wrong is the ounce, because the same word covers two different weights. An avoirdupois ounce is one sixteenth of a pound and is the one used for food and parcels; a troy ounce is about 10% heavier (31.1035 g) and is used for precious metals. A price per ounce is meaningless until you know which ounce is meant.
To check a weight conversion, convert the result back, or go through the pound or the kilogram as a middle step. The commonest error is converting a figure stated in pounds into kilograms and then comparing it with a figure that was already in kilograms, which doubles or halves nothing and merely hides the mistake.
Tanzania reference points
Real quantities, converted into grams.
The most a packet declared between 500 g and 1 kg may fall short under Tanzanian weights and measures rules
15 g
Table IIIC of the 2019 regulations allows an individual deficiency of 1.5%, or 15 g, on a nominal net content between 500 g and 1 kg. Regulation 179 separately requires the average net content of a whole lot to be at least what the packet declares, so the tolerance is on single packets rather than the batch.
Source: The Weights and Measures (General) Regulations, 2019 (GN No. 288) — Weights and Measures Agency · verified 2026-09-14
Grams conversion tables
Grams to Milligrams
| Grams (g) | Milligrams (mg) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
Grams to Kilograms
| Grams (g) | Kilograms (kg) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
Grams to Tonnes (metric)
| Grams (g) | Tonnes (metric) (t) |
|---|---|
| 1 | 1e-6 |
| 2 | 2e-6 |
| 3 | 3e-6 |
| 4 | 4e-6 |
| 5 | 5e-6 |
| 10 | 1e-5 |
| 25 | 2.5e-5 |
| 50 | 5e-5 |
| 100 | 1e-4 |
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