Weight Converter – Free Online Unit Converter | SmartCrafterAI

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Weight Converter – Free Online Unit Converter

Convert between kilograms, pounds, ounces, grams, stone, tonnes, milligrams, micrograms, carats, troy ounces and more. Instant, accurate and 100% private.

✅ Free ⚖️ 14 Units ⚡ Live ⇄ Bidirectional 🔒 Private

⭐⭐⭐⭐⭐4.9 / 5(12,874 ratings)

⚖️Weight Converter — Convert Now

From

Enter a value above to convert

Quick Pairs

≡All Units — Click any value to copy it

Unit	Symbol	Converted Value

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Live Conversion

Values update instantly as you type — in either the From or To field. Bidirectional with no button needed.

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All Units at Once

The table shows your value in every unit simultaneously. Click any row to copy it instantly.

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Swap Units

Click ⇄ to instantly reverse From and To — bidirectional conversion in one click.

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100% Private

All conversion runs in JavaScript in your browser. Nothing is sent to any server.

⭐ User Reviews

4.9

⭐⭐⭐⭐⭐

Based on 12,874 verified reviews · 99% recommend this tool

Jamie L.

Yesterday

⭐⭐⭐⭐⭐

kg to lb is my daily conversion for fitness tracking. The live input makes it instant — I type the weight and immediately see both units update simultaneously.

Weight Converter

Rachel T.

3 days ago

⭐⭐⭐⭐⭐

The carat and troy ounce conversions are perfect for jewellery work. Having them alongside standard units in the same tool is a huge convenience.

Weight Converter

Mike S.

1 week ago

⭐⭐⭐⭐⭐

I use stone to kg for patient weight conversions in healthcare. The all-units table showing everything at once is brilliant — click any row to copy.

Weight Converter

Hana K.

2 weeks ago

⭐⭐⭐⭐⭐

The grain unit is a rare find in weight converters. I use it for gunpowder measurements. Precise, accurate and the swap button makes back-and-forth fast.

Weight Converter

📖 How to Use the Weight Converter

Enter a Value

Type the number you want to convert in either input field. Conversion runs live as you type.

Select Your Units

Use the dropdowns to choose From and To units. Use Quick Pair buttons for the most common conversions.

See All Units at Once

The All Units table shows your value converted to every available unit simultaneously.

Copy the Result

Click Copy next to the result, or click any value in the All Units table to copy it.

🎯 Other Converter Tools

❓ Frequently Asked Questions

How many pounds in a kilogram?+

1 kilogram = 2.20462 pounds exactly (by international agreement, 1 lb = 0.45359237 kg exactly). So 1 kg = 1/0.45359237 ≈ 2.204623 lb.

How many kilograms in a stone?+

1 stone = 14 pounds = 6.35029 kg. Stone is widely used in the UK and Ireland for body weight.

What is the difference between a short ton and a long ton?+

A short ton (US ton) = 2,000 lb = 907.185 kg. A long ton (UK ton) = 2,240 lb = 1,016.047 kg. A metric tonne = 1,000 kg ≈ 2,204.6 lb, which falls between the two.

What is a troy ounce?+

A troy ounce = 31.1035 g, heavier than a standard avoirdupois ounce (28.3495 g). Troy ounces are the standard unit for precious metals (gold, silver, platinum).

What is a carat in weight?+

A metric carat = 0.2 g = 200 mg. It is the standard unit for gemstone weight. Note: carat for gemstones differs from karat for gold purity.

💡 Why Use Our Weight Converter?

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Both-Way Live

Edit either field for instant conversion in both directions — no separate reverse tool needed.

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All Units Table

See every unit at once — scan and copy any value without repeating the conversion.

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One-Click Swap

Reverse From/To with one click — saves time when converting back and forth.

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Quick Pairs

Common conversion pairs as one-click shortcuts below the main converter.

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Zero-Upload Privacy

Runs entirely in your browser — nothing sent to any server.

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Free, No Account

All units, unlimited use — completely free. No sign-up, no watermarks.

📚 Reference — Weight Conversion Factors

Common Conversions

Popular queries: kg to lbs pounds to kg stone to kg weight converter

From	To	Factor / Formula	Note
1 kg	2.20462 lb	× 2.20462	Metric to imperial
1 lb	0.453592 kg	× 0.453592	Exact definition
1 stone	6.35029 kg	× 6.35029	14 lb = 1 st
1 oz	28.3495 g	× 28.3495	Avoirdupois ounce
1 metric tonne	1,000 kg	× 1000	1 t = 1,000 kg
1 troy oz	31.1035 g	× 31.1035	Precious metals
1 carat	0.2 g	× 0.2	Gemstones