Common Converters

Weight & Mass Units

Find the right formula and tools for all weight units. We use official rules to make sure every calculation is correct.

All Weight & Mass Unit Pairs

Pick a starting unit to see all possible conversion tools for weight & mass.

Kilograms (kg)

Grams (g)

Milligrams (mg)

Micrograms (µg)

Nanograms (ng)

Metric Tons (t)

Pounds (lb)

Ounces (oz)

Stone (st)

US Short Tons

UK Long Tons

Carats (ct)

Slugs

Atomic Mass Units (u)

Our Standard Unit: Kilograms (kg)

We calculate all weight & mass units based on the standard Kilograms (kg). This helps us keep all our tools accurate and reliable.

Conversion Formulas

Below is the list of rules we use to calculate each weight & mass unit. You can use these to understand the math behind our tools.

Grams (g)

Formula: 1 Grams = 0.001 Kilograms
To do the math instantly, use our grams to kilograms or kilograms to grams tools.

Milligrams (mg)

Formula: 1 Milligrams = 0.000001 Kilograms
To do the math instantly, use our milligrams to kilograms or kilograms to milligrams tools.

Micrograms (µg)

Formula: 1 Micrograms = 1e-9 Kilograms
To do the math instantly, use our micrograms to kilograms or kilograms to micrograms tools.

Nanograms (ng)

Formula: 1 Nanograms = 1e-12 Kilograms
To do the math instantly, use our nanograms to kilograms or kilograms to nanograms tools.

Metric Tons (t)

Formula: 1 Metric Tons = 1000 Kilograms
To do the math instantly, use our metric tons to kilograms or kilograms to metric tons tools.

Pounds (lb)

Formula: 1 Pounds = 0.45359237 Kilograms
To do the math instantly, use our pounds to kilograms or kilograms to pounds tools.

Ounces (oz)

Formula: 1 Ounces = 0.0283495231 Kilograms
To do the math instantly, use our ounces to kilograms or kilograms to ounces tools.

Stone (st)

Formula: 1 Stone = 6.35029 Kilograms
To do the math instantly, use our stone to kilograms or kilograms to stone tools.

US Short Tons

Formula: 1 US Short Tons = 907.1847 Kilograms
To do the math instantly, use our us short tons to kilograms or kilograms to us short tons tools.

UK Long Tons

Formula: 1 UK Long Tons = 1016.0469 Kilograms
To do the math instantly, use our uk long tons to kilograms or kilograms to uk long tons tools.

Carats (ct)

Formula: 1 Carats = 0.0002 Kilograms
To do the math instantly, use our carats to kilograms or kilograms to carats tools.

Slugs

Formula: 1 Slugs = 14.5939 Kilograms
To do the math instantly, use our slugs to kilograms or kilograms to slugs tools.

Atomic Mass Units (u)

Formula: 1 Atomic Mass Units = 1.660539e-27 Kilograms
To do the math instantly, use our atomic mass units to kilograms or kilograms to atomic mass units tools.

All Systems

Compare these units against other measurement systems on our homepage.

All Unit Conversion Systems

Access our high-fidelity calculators for other measurement systems and engineering metrics.