Weight Converter

Convert weight between metric and imperial — kg, grams, pounds, ounces, stone, tonnes.

100% Browser-Based Local Processing

How this conversion works

The relation

Worked example

    4

    Common weight conversions

    KilogramsPounds

    Privacy Focused

    🔒 Local Processing. The values you enter never leave your device.

    Instant Results

    🌐 Fully Client-Side. Runs instantly in your browser.

    No Signup

    ⚡ No accounts. No API keys. Just open and use.

    Browser Based

    🚀 No installs, no sign-ups, no conversion limits.

    What is a Weight Converter?

    > Weight Converter turns any mass between metric and imperial units — kilograms, grams, milligrams, tonnes, pounds, ounces, and stone. Enter a value, pick your units, and read the result with the exact factor shown (1 pound = 0.45359237 kg exactly; 1 kg ≈ 2.20462 lb). It runs in your browser and works offline. ---

    ### H2: Convert weight between metric and imperial — with the math shown

    Weight conversions trip people up more than almost any other unit, because the everyday words hide real differences. A recipe from the US lists ounces while your scale reads grams; a package is quoted in pounds but the courier wants kilograms; and in the UK body weight is still spoken in stone. Most of the time you just want a number you can trust.

    This converter covers the seven units people actually use: kilogram, gram, milligram, and tonne on the metric side, and pound, ounce, and stone on the imperial side. Type a value, choose what you're converting *from* and *to*, and the answer appears instantly. A swap button reverses the direction, and the all-units table expands a single value into every unit at once, so "1 kilogram" becomes 1000 g, 2.20462 lb, 35.274 oz, and 0.157473 stone on one screen.

    The tool shows the exact conversion factor behind each result. A pound is 0.45359237 kilograms by international definition — an exact figure agreed in 1959 — and the tool states it so you can verify the answer rather than trust a black box. A stone is exactly 14 pounds; an ounce is exactly one-sixteenth of a pound.

    It also handles the ambiguous units honestly. "Ton" can mean a metric tonne (1000 kg), a US short ton (907.18 kg), or a UK long ton (1016.05 kg), so the tool labels which one you're using. And the ounce here is the avoirdupois ounce used for everyday weight — not the troy ounce used for gold and silver, which is heavier. Everything runs on your own device using fixed factors, so there's nothing to upload, no account, and no connection needed once loaded.

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    How to use the Weight Converter

    Step 1: Enter your value. Type the number you want to convert into the input box

    Decimals are fine.

    Step 2: Pick the "from" unit. Choose the unit your number is currently in — for example, pounds (lb)

    Pick the "from" unit. Choose the unit your number is currently in — for example, pounds (lb).

    Step 3: Pick the "to" unit. Choose the unit you want the answer in — for example, kilograms (kg)

    The result updates instantly.

    Step 4: Read the result and the factor. The converted value appears with the exact relationship used (for example, 1 lb = 0.45359237 kg), so you can verify it

    Read the result and the factor. The converted value appears with the exact relationship used (for example, 1 lb = 0.45359237 kg), so you can verify it.

    Step 5: Copy, swap, or expand. Use Copy to grab the number, the swap button to reverse the direction, or open the all-units table to see your value in every unit at once

    Adjust the decimal places for more precision.

    Weight Converter in action

    Weight converter turning 100 kilograms into 220.4623 pounds, with the note underneath giving the exact definition of the pound in kilograms.
    Converting, with the exact factor underneath
    The weight converter unit list open at the boundary between its metric group and its imperial and US group, with the short and long ton listed separately below the heading.
    The unit list, grouped and searchable
    The kilograms-to-pounds reference table listing common values side by side beneath the converter.
    The reference table for the pair on screen
    The weight converter on a phone screen, the two panes stacked with the swap control between them.
    The same tool on a phone

    Frequently Asked Questions

    How many pounds are in a kilogram?

    About 2.20462. One kilogram equals 2.2046226 pounds, because a pound is defined as 0.45359237 kilograms exactly. So 10 kg is about 22.05 lb, and to go the other way you multiply pounds by 0.45359237 to get kilograms. The converter uses this exact factor and shows it with every result.

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    How many grams are in an ounce?

    Exactly 28.349523125. In practice it's rounded to 28.35 g. This is the avoirdupois ounce used for everyday weight — one-sixteenth of a pound. So 4 oz is about 113.4 g. Note that the troy ounce used for gold and silver is different and heavier, at 31.1035 g.

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    How many pounds are in a stone?

    Exactly 14. One stone equals 14 pounds, which is about 6.35029 kilograms. Stone is still widely used for body weight in the UK and Ireland — so 12 stone is 168 pounds, or roughly 76.2 kg. Enter any value and the tool converts between stone, pounds, and kilograms with the factor shown.

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    How do I convert kilograms to pounds?

    Multiply kilograms by 2.2046226 to get pounds, because one pound is 0.45359237 kilograms exactly. For example, 70 kg × 2.20462 ≈ 154.32 lb. To reverse it, multiply pounds by 0.45359237 to get kilograms. The tool applies this automatically and displays the factor it used, so the result is easy to verify.

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    Is a metric ton the same as a US ton?

    No — this is a common and costly mix-up. A metric tonne is 1000 kilograms (about 2204.6 lb). A US short ton is 2000 pounds (907.18 kg), and a UK long ton is 2240 pounds (1016.05 kg). They're all different, so the tool labels which "ton" you're using. Always confirm the type before converting large weights.

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    What's the difference between an ounce and a troy ounce?

    They measure different things. The everyday avoirdupois ounce (28.3495 g) is one-sixteenth of a pound and is used for food and general weight. The troy ounce (31.1035 g) is heavier and is used only for precious metals like gold and silver. A "1 oz" gold coin is a troy ounce, so it weighs more than a kitchen ounce — don't mix them up when pricing metals.

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    Is weight the same as mass?

    In everyday use, yes — but strictly they're different. Mass is the amount of matter in an object (measured in kilograms); weight is the force gravity exerts on that mass (measured in newtons). On Earth's surface the numbers line up, so people use the words interchangeably. This tool converts mass units; for force in newtons, use the Force Converter.

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    How many ounces are in a pound?

    Exactly 16. One pound is 16 avoirdupois ounces, so half a pound is 8 oz and a quarter-pound is 4 oz. This is exact by definition. In grams, that means a pound is about 453.6 g and an ounce is about 28.35 g. The all-units table shows pounds, ounces, and grams together for any value you enter.

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    Is this converter exact, or does it round the answer?

    The math is exact — it uses defined conversion factors (1 lb = 0.45359237 kg, 1 stone = 14 lb, 1 oz = 1/16 lb). Only the *displayed* value is rounded for readability, and you can increase the decimal places if you need more precision. The factor shown with each result lets you check the figure yourself.

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    What's the formula to convert between metric and imperial weight?

    Convert everything through kilograms. Multiply your value by its factor to kilograms (pound → ×0.45359237, ounce → ×0.028349523, stone → ×6.35029318), then divide by the target unit's factor. For pounds to grams: kilograms = pounds × 0.45359237, then grams = kilograms ÷ 0.001. The tool applies this two-step method for any pair of units.

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    Does the tool work offline, and does it upload my data?

    It works fully offline once the page has loaded, and it never uploads anything. All conversions are pure arithmetic using fixed factors, so the calculation happens on your own device — no server, no account, no tracking. That makes it dependable with no signal, and private by design because there's nothing to send anywhere.

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    Which unit should I use for body weight — kilograms, pounds, or stone?

    It depends on where you are. Most of the world uses kilograms; the US uses pounds; the UK and Ireland often use stone and pounds (for example, "11 stone 4"). They're all exact conversions of one another, so pick whichever your doctor, gym, or country uses — 80 kg is about 176 lb, or 12 stone 8. The tool shows all three at once in the all-units table.

    Still have questions?

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