Mass Unit Converterkg · lb · g · oz · mg · stone · tonne
Convert any mass or weight unit instantly kilograms to pounds, grams to ounces, milligrams to grams, pounds to stone, and metric tonnes to kilograms. Built for everyday use, cooking, science, and industry. Type once, copy anywhere. Always free.
Supported Units
The Right Conversion for Every Context
Mass units vary widely by field — cooking uses oz and g, science uses mg, freight uses tonnes, jewellery uses troy ounces
Kitchen & Cooking
oz → gUS recipes list butter, flour, chocolate in ounces (oz); EU recipes use grams (g). Convert instantly for any ingredient.
Gold, Silver & Jewellery
troy oz → gPrecious metals use troy ounces (troy oz), not regular ounces. A troy ounce is ~10% heavier than an avoirdupois ounce (28.35 g).
Science & Medicine
mg → gDrug dosages, vitamin labels, and lab measurements use milligrams (mg). Convert to grams (g) or micrograms (µg) for calculations.
Freight & Engineering
kg → tMetric tonnes (t) are used in shipping, construction, and cargo. One metric ton equals 1,000 kilograms (kg) or 2,204.6 pounds (lb).
Exact Conversion Formulas
Precise multipliers and dividers for every common mass conversion — verify or calculate manually
| Convert | Formula | Quick Example |
|---|---|---|
| kg → lb | kg × 2.20462 | 70 kg = 154.32 lb |
| lb → kg | lb ÷ 2.20462 | 150 lb = 68.04 kg |
| g → oz | g ÷ 28.3495 | 100 g = 3.527 oz |
| oz → g | oz × 28.3495 | 8 oz = 226.8 g |
| kg → g | kg × 1,000 | 2.5 kg = 2,500 g |
| g → mg | g × 1,000 | 0.5 g = 500 mg |
| kg → st | kg ÷ 6.35029 | 75 kg = 11.8 st |
| lb → st | lb ÷ 14 | 168 lb = 12 st |
| t → kg | t × 1,000 | 2.5 t = 2,500 kg |
| troy → g | troy × 31.1035 | 5 troy oz = 155.5 g |
* Troy ounce values apply to precious metals (gold, silver, platinum). Everyday food/body weight uses avoirdupois ounce (1 oz = 28.3495 g).
What Does a Mass Actually Look Like?
Anchor abstract unit values to familiar everyday objects helps verify your conversion makes sense
A grain of rice
~25–30 mg
A paperclip
~1 g
A teaspoon of water
~5 g
A large egg
~60 g
A tennis ball
~58 g
A can of soda
~370 g
A litre of water
~1 kg
A car tyre
~10–12 kg
Use these references as a sanity check after converting. If you convert 2 kg and the result claims it's only 4 oz, something's wrong 2 kg should be ~70.5 oz. The scale above helps you build intuition for mass units so copy-paste errors are caught before they matter.
From Input to Clipboard in Seconds
No dropdowns to configure, no output unit to select — just type and copy
Type or paste a value
Enter any mass integer or decimal. Paste directly from a label, document, or recipe. Supported: kg, g, mg, lb, oz, st, tonne, troy oz.
Pick the source unit
Select your input unit from the dropdown. All output rows every supported unit update simultaneously as you type.
Copy any result
Each output row has a dedicated Copy button. One tap puts that value on your clipboard ready to paste into any app.
Decimal inputs fully supported
Enter 5.75 lb or 0.25 kg the converter maintains full precision. No need to round before converting.
All units output simultaneously
You don't need to select a target unit. mg, g, kg, oz, lb, stone, tonne all appear at once in a single view.
Answers to the Most Searched Questions
Covering kg, lb, g, oz, mg, stone, tonne, troy ounce with exact formulas and worked examples
Core Conversions
Enter your kilogram (kg) value, select kg as the source unit — the pound (lb) result appears instantly. Formula: kg × 2.20462 = lb. Example: 70 kg = 154.32 lb. Copy the result with one tap. The exact factor is 1 kilogram = 2.20462262185 pounds.
Exactly 1 kilogram (kg) = 1,000 grams (g). This is a fixed metric definition — no rounding. In reverse: 1 g = 0.001 kg. Common references: 500 g = 0.5 kg; 250 g = 0.25 kg. The gram (g) and kilogram (kg) are both SI units, separated by a factor of 1,000.
Pounds to kilograms: lb ÷ 2.20462 = kg. Example: 180 lb = 81.65 kg. Kilograms to pounds: kg × 2.20462 = lb. Example: 65 kg = 143.3 lb. The converter handles both directions simultaneously — type in either unit and see all outputs update together.
Exactly 1 pound (lb) = 16 ounces (oz). In reverse: 1 oz = 0.0625 lb. In metric: 1 lb = 453.592 grams (g); 1 oz = 28.3495 g. Note: this applies to avoirdupois ounces used in everyday weight — distinct from troy ounces (31.10 g) used for precious metals.
UntangleTools Mass Converter supports: milligram (mg), gram (g), kilogram (kg), ounce (oz), pound (lb), stone (st), metric tonne (t), and troy ounce. Type any value, select the source unit, and every other unit's equivalent appears at once. One-click copy per result. Free, no login, works on mobile and desktop.
Three steps: (1) Type or paste a mass value into the input — decimals are fully supported. (2) Choose the source unit from the dropdown: mg, g, kg, oz, lb, stone, or tonne. (3) All output units update instantly. Click the Copy button next to any row to copy that specific value. No page reload, no account, no install needed.
Yes. The tool converts freely between SI metric units (milligram / mg, gram / g, kilogram / kg, metric tonne / t) and imperial / US customary units (ounce / oz, pound / lb, stone / st). Select any unit as your input and all conversions — metric and imperial — appear simultaneously. No mode switching required.
Multiply kilograms by 1,000: kg × 1,000 = g. Examples: 1.5 kg = 1,500 g; 0.25 kg = 250 g; 3 kg = 3,000 g. In reverse: g ÷ 1,000 = kg. This is a pure metric-system rule — the prefix "kilo-" always means one thousand. No rounding, no approximation needed.
Mass is the amount of matter in an object — measured in kilograms (kg), grams (g), or pounds (lb) — and is constant everywhere in the universe. Weight is the force gravity exerts on that mass — measured in Newtons (N). In everyday language, "weight" and "mass" are used interchangeably, and scales measure mass. On the Moon, your mass in kg stays the same, but your weight (in N) is about 1/6th of what it is on Earth.
Multiply troy ounces by 31.1035: troy oz × 31.1035 = g. Examples: 1 troy oz = 31.10 g; 0.5 troy oz = 15.55 g; 10 troy oz = 311.0 g. Important: the troy ounce ≠ avoirdupois ounce. A regular oz = 28.35 g; a troy oz = 31.10 g (~9.7% heavier). All gold, silver, and platinum spot prices are quoted per troy ounce. This converter includes troy ounce as a selectable unit.
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