Unit converter

Weight and Mass converter

Convert kilograms, pounds, ounces, stones, tons, and other mass units.

Enter a value and choose units. Results update instantly.

1 lb = 0.45359237 kg

All Mass units

From 1 lb
UnitValue
Kilogram kg 0.45359237
Gram g 453.59237
Milligram mg 453,592.3700000001
Metric ton t 0.0004535924
Pound lb 1
Ounce oz 16
Stone st 0.0714285714
US short ton short ton 0.0005
Imperial long ton long ton 0.0004464286
Carat ct 2,267.96185
Recent conversions
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Common tasks

Pound to Kilogramlb to kg Kilogram to Poundkg to lb Stone to Kilogramst to kg Ounce to Gramoz to g Metric ton to Poundt to lb Gram to Ounceg to oz

Reference

How weight and mass conversion works

In everyday language, weight usually means mass. Calculations here use the kilogram as the reference quantity and do not apply local gravitational acceleration.

Values are converted to kilogram first, then from that reference into the requested unit. Keeping a single documented reference reduces inconsistent pair-by-pair constants.

Accuracy note: International avoirdupois and metric mass definitions are exact; displayed results are rounded only for readability.

Unit reference

UnitSymbol1 unit in kg
Kilogramkg1
Gramg0.001
Milligrammg0.000001
Metric tont1,000
Poundlb0.45359237
Ounceoz0.028349523125
Stonest6.35029318
US short tonshort ton907.18474
Imperial long tonlong ton1,016.0469088
Caratct0.0002

Long-tail directory

Every indexed conversion

Choose a source unit to see all available destinations.

From Kilogram (kg)
Kilogram to GramKilogram to MilligramKilogram to Metric tonKilogram to PoundKilogram to OunceKilogram to StoneKilogram to US short ton
From Gram (g)
Gram to KilogramGram to MilligramGram to Metric tonGram to PoundGram to OunceGram to StoneGram to US short ton
From Milligram (mg)
Milligram to KilogramMilligram to GramMilligram to Metric tonMilligram to PoundMilligram to OunceMilligram to StoneMilligram to US short ton
From Metric ton (t)
Metric ton to KilogramMetric ton to GramMetric ton to MilligramMetric ton to PoundMetric ton to OunceMetric ton to StoneMetric ton to US short ton
From Pound (lb)
Pound to KilogramPound to GramPound to MilligramPound to Metric tonPound to OuncePound to StonePound to US short ton
From Ounce (oz)
Ounce to KilogramOunce to GramOunce to MilligramOunce to Metric tonOunce to PoundOunce to StoneOunce to US short ton
From Stone (st)
Stone to KilogramStone to GramStone to MilligramStone to Metric tonStone to PoundStone to OunceStone to US short ton
From US short ton (short ton)
US short ton to KilogramUS short ton to GramUS short ton to MilligramUS short ton to Metric tonUS short ton to PoundUS short ton to OunceUS short ton to Stone

Primary source

Definitions and standards

Conversion constants and definitions for this category are checked against NIST SP 811: Units outside the SI.

See Methods & sources for rounding rules, exact-value handling, and review policy.

Questions

Weight and Mass FAQ

What is the reference unit for weight and mass conversions?

ConvertWin uses kilogram (kg) as the internal reference for this category, then converts to the selected output unit.

How accurate is this weight and mass converter?

International avoirdupois and metric mass definitions are exact; displayed results are rounded only for readability.