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Mass Unit Converter

Result equals value times the ratio of conversion factors

Mass Conversion =

1 Kilogram (kg)

Solution in Other Units

UnitValue
Kilogram (kg)1
Gram (g)1000
Milligram (mg)1000000
Microgram (µg)1.0000000e+9
Tonne (t)0.001
Pound (lb)2.2046226
Ounce (oz)35.273962
Ton Short (short tn)0.0011023113
Stone (st)0.15747304
Slug (slug)0.068521766
Atomic Mass Unit (u)6.0229553e+26
Attogram (ag)1e+21
Carat Metric (ct)5000
Centigram (cg)100000
Decigram (dg)10000
Dekagram (dag)100
Dram (dr)564.38339
Exagram (Eg)1e-15
Femtogram (fg)1e+18
Gigagram (Gg)1e-6
Grain (gr)15432.358
Hundredweight Long UK (cwt)0.019684131
Hundredweight Short US (cwt)0.022046226
Megagram (Mg)0.001
Nanogram (ng)1e+12
Pennyweight (dwt)643.01493
Petagram (Pg)1e-12
Picogram (pg)1e+15
Planck Mass (mₚ)45940892
Solar Mass (M☉)5.0273993e-31
Teragram (Tg)1e-9
Ton Long (long tn)0.00098420653
Ton Metric (t)0.001
Troy Ounce (oz t)32.150747
Yoctogram (yg)1e+27
Yottagram (Yg)1e-21
Zeptogram (zg)1e+24
Zettagram (Zg)1e-18
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Mass Unit Conversion

This converter uses the pound as its internal base unit and multiplies the input value by the source unit’s factor, then divides by the target unit’s factor to produce the result. All calculations use arbitrary-precision BigNumber arithmetic.

result = value × (from factor / to factor)

How It Works

This converter uses the pound as its internal base unit and multiplies the input value by the source unit’s factor, then divides by the target unit’s factor to produce the result. All calculations use arbitrary-precision BigNumber arithmetic, ensuring accurate conversions across the full range from attograms to yottagrams.

Example Problem

Convert 150 pounds to kilograms:

  1. 150 × 0.45359237 = 68.04 kg

The conversion factor 0.45359237 is the exact definition of one avoirdupois pound in kilograms.

Key Concepts

Mass conversion uses exact or internationally defined ratios between units. The kilogram is the SI base unit of mass, redefined in 2019 by fixing the Planck constant. The avoirdupois system (pounds, ounces) is standard in US commerce, while the troy system (troy ounces) is used for precious metals. This converter uses arbitrary-precision BigNumber arithmetic to maintain accuracy across the full range from micrograms to metric tons.

Applications

  • Cooking and nutrition: converting between grams, ounces, and pounds for recipes and dietary tracking
  • Shipping and logistics: converting package weights between metric and imperial systems for international freight
  • Science and medicine: converting drug dosages between milligrams, micrograms, and grains
  • Precious metals: converting between troy ounces and grams for gold and silver trading

Common Mistakes

  • Confusing troy ounces with avoirdupois ounces — a troy ounce (31.1 g) is heavier than a standard ounce (28.35 g), which matters for precious metal pricing
  • Using mass units interchangeably with weight units — kilograms measure mass while newtons measure force (weight); they are proportional only at Earth's surface gravity
  • Forgetting that the metric ton (1,000 kg) differs from the US short ton (907.2 kg) and the UK long ton (1,016 kg)

Frequently Asked Questions

How many pounds are in a kilogram?

One kilogram equals approximately 2.20462 pounds. The kilogram is the SI base unit of mass, defined by the Planck constant since 2019.

What is the difference between mass and weight?

Mass measures the amount of matter in an object (kilograms), while weight is the gravitational force acting on that mass (newtons). On Earth’s surface, they are proportional, but in space an object has mass but virtually no weight.

How many ounces are in a pound?

There are exactly 16 ounces in one pound. This applies to avoirdupois ounces and pounds, which are the standard units used in everyday commerce in the US and UK.

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