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Weight & Mass Converter

Imperial • Metric • 9 units

Value to Convert ⓘ

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How to Use the Weight Converter

Enter a weight value — type any positive number (e.g. 150 for pounds, 70 for kg). Negatives are blocked.
Choose your From unit — pounds, ounces, kilograms, grams, stones, or tons.
Choose your To unit — the unit you want to convert to.
See instant results — the converted value appears along with common equivalents (kg, g, lb, oz all shown).
Use the swap button (⇄) — reverse the conversion in one click.

Why Use This Weight Converter

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Fitness & Health

Track your weight in both lbs and kg for international gym equipment, nutrition labels, and doctor visits.

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Shipping & Packages

Convert package weights for USPS, UPS, FedEx and international carriers that use kg.

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Cooking & Baking

Convert grams and ounces for international recipes — European recipes always use metric weights.

Weight Conversion Guide — Pounds, Kilograms, Ounces & Grams

Weight conversion is one of the most frequently searched calculations in the United States. The reason: Americans track body weight in pounds (lbs) while most of the world — and all scientific, medical, and pharmaceutical contexts — use kilograms. A person weighing 180 pounds weighs 81.65 kg. The simple mental shortcut: divide pounds by 2.2 to get kilograms (exact factor is 2.20462). To go from kg to lbs, multiply by 2.2046.

Ounces to grams is critical for cooking and postal purposes. 1 ounce (avoirdupois) = 28.3495 grams. A common confusion: the "fluid ounce" is a volume measurement, not a weight — our cooking converter handles fluid ounces separately. For dry ingredients in recipes: 1 oz = 28.35 g, 4 oz = 113.4 g (quarter pound), 8 oz = 226.8 g (half pound), 16 oz = 453.6 g = 1 pound.

Stone is a weight unit used primarily in the UK and Ireland for expressing body weight. 1 stone = 14 pounds = 6.35029 kg. If someone in the UK says they weigh "12 stone 4 lbs", that's 172 lbs or 78.02 kg. Short ton (US) = 2,000 lbs = 907.185 kg. Long ton (UK) = 2,240 lbs = 1,016.05 kg. Metric ton (tonne) = 1,000 kg = 2,204.62 lbs.

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Body Weight Reference

100 lbs = 45.36 kg. 120 lbs = 54.43 kg. 150 lbs = 68.04 kg. 180 lbs = 81.65 kg. 200 lbs = 90.72 kg. 250 lbs = 113.4 kg. To convert: ÷2.2046.

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Cooking Reference

1 oz = 28.35 g. 4 oz = 113 g. 8 oz (½ lb) = 227 g. 1 lb = 454 g. 1 stick butter = 4 oz = 113 g. 1 cup flour ≈ 120 g. 1 cup sugar ≈ 200 g.

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Postal & Shipping

USPS first class max: 13 oz. Flat rate box: up to 70 lbs. International priority mail: priced by 0.5 kg increments. Standard letter: 1 oz = 28 g max.

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Gym Weights

45 lb Olympic barbell = 20.41 kg. 45 lb plate = 20.41 kg. 25 lb plate = 11.34 kg. 2.5 lb = 1.13 kg. Most commercial gym dumbbells: labeled in lbs and kg.

Weight Conversion FAQ

How many pounds in a kilogram? ▾

1 kilogram = 2.20462 pounds. Conversely, 1 pound = 0.453592 kg. Quick mental math: multiply kg by 2.2 for lbs (slightly low), or divide lbs by 2.2 for kg (slightly high). For exact conversion: multiply kg × 2.20462 = lbs, or multiply lbs × 0.453592 = kg. Examples: 70 kg = 154.3 lbs. 80 kg = 176.4 lbs. 100 kg = 220.5 lbs.

How many grams in an ounce? ▾

1 ounce (avoirdupois) = 28.3495 grams exactly. This is the standard ounce used in everyday US measurements. Note: the troy ounce (used for precious metals) = 31.1035 grams — about 10% heavier. When jewelers say "1 oz gold," they mean 31.1 g, not 28.35 g. For cooking and postal use, always use avoirdupois ounces (28.35 g).

How many ounces in a pound? ▾

16 ounces = 1 pound. 1 oz = 0.0625 lbs. This is the avoirdupois system used in everyday US measurements. Common fractions: ¼ lb = 4 oz = 113 g. ⅓ lb = 5.33 oz = 151 g. ½ lb = 8 oz = 227 g. ¾ lb = 12 oz = 340 g. A "quarter-pounder" burger is 4 oz (113 g) pre-cook.

What is a stone in pounds and kg? ▾

1 stone = 14 pounds = 6.35029 kg. Stone is primarily used in the UK and Ireland for body weight. Example conversions: 10 stone = 140 lbs = 63.5 kg. 11 stone = 154 lbs = 69.9 kg. 12 stone = 168 lbs = 76.2 kg. 13 stone = 182 lbs = 82.6 kg. 14 stone = 196 lbs = 88.9 kg.

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

Metric ton (tonne) = 1,000 kg = 2,204.6 lbs. Used internationally in commerce and industry. Short ton (US ton) = 2,000 lbs = 907.185 kg. Used in the United States. Long ton (UK ton) = 2,240 lbs = 1,016.05 kg. Was used in the UK before metrication; now rarely used. When you see "ton" on a US truck's payload rating or at a US salvage yard, it means short ton.