Weight converters

Weight (more strictly, mass) is measured in kilograms in the metric system and in pounds in the imperial and US customary systems. The metric system traces back to the post-revolution French Republic; the kilogram has been the SI base unit of mass since 1889. Conversion factors here are exact by the 1959 international avoirdupois agreement: 1 lb = 0.45359237 kg.

Popular weight conversions

Grams to Kilograms

Kilograms to Metric tons

Metric tons to Kilograms

t → kg

Metric tons to Ounces

t → oz

Metric tons to Pounds

t → lb

Metric tons to Stones

Ounces to Metric tons

Pounds to Metric tons

Stones to Metric tons

Milligrams to Kilograms

mg → kg

Kilograms to Milligrams

kg → mg

Micrograms to Milligrams

µg → mg

Milligrams to Micrograms

mg → µg

Short tons (US tons) to Kilograms

tn → kg

Kilograms to Short tons (US tons)

kg → tn

Short tons (US tons) to Pounds

tn → lb

Pounds to Short tons (US tons)

lb → tn

Short tons (US tons) to Metric tons

tn → t

Metric tons to Short tons (US tons)

t → tn

Long tons to Metric tons

long tn → t

Metric tons to Long tons

t → long tn

Long tons to Kilograms

long tn → kg

Kilograms to Long tons

All weight units

The 12 units below can be selected as source or target inside any weight converter.

Grams
g · Metric
Kilograms
kg · Metric
Metric tons
t · Metric
Ounces
oz · Imperial
Pounds
lb · Imperial
Milligrams
mg · Metric
Micrograms
µg · Metric
Short tons (US tons)
tn · US customary
Long tons
long tn · Imperial
Carats
ct · Metric
Grains
gr · Imperial
Stones
st · Imperial

Weight units in terms of the kilogram

Every weight unit on Convertitive is defined as an exact ratio of the kilogram (kg), the reference unit for this category. The table below shows what one of each unit equals in kilograms — the constant every converter on this page is built from.

Weight units expressed in kilograms
Unit	Symbol	1 unit in kilograms
Grams	g	0.001 kg
Kilograms	kg	base unit
Metric tons	t	1000 kg
Ounces	oz	0.0283495 kg
Pounds	lb	0.453592 kg
Milligrams	mg	1.0000 × 10^−6 kg
Micrograms	µg	1.0000 × 10^−9 kg
Short tons (US tons)	tn	907.185 kg
Long tons	long tn	1016.05 kg
Carats	ct	0.0002 kg
Grains	gr	6.4799 × 10^−5 kg
Stones	st	6.35029 kg

To convert between any two units, Convertitive scales the input to kilograms using these factors and then back out to the target unit — so every result on this page traces to a single, exact definition rather than a chained approximation. Pick any pair above to see the formula, a 50-row reference table, and worked examples.

Grams to kilograms reference table

Common grams values with their kilograms equivalent, computed with the same factors the converter uses.

g	kg
0.1	0.0001
1.5	0.0015
5	0.005
9	0.009
20	0.02
40	0.04
75	0.075
120	0.12
200	0.2
300	0.3
600	0.6
5000	5

Need a value that is not listed? Open the g to kg converter and type any number.