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Kilograms to grams converter

Convert kilograms to grams (kg to grams) with the exact factor, a conversion chart and worked steps.

Updated Checked against 3 worked examples

kg
Try
Grams
g
Grams: 1,500 g
Shown to 12 significant figures, half-up
Conversion
1.5 kg = 1,500 g
1 g in kilograms
0.001kg

1.5 kilograms is 1,500 grams. Going the other way, 1 g is 0.001 kg.

Kilograms to grams

02,5005,0007,50010,000246810kgg1.5 → 1,500
Kg to grams chart (10 rows)
KilogramsGrams
0.1100
0.25250
0.5500
0.75750
11,000
1.51,500
22,000
2.52,500
55,000
1010,000
How it's calculated S

  1. Conversion factor

    1 kg=1,000 g1\ \text{kg} = 1{,}000\ \text{g}

    Exact by definition.

  2. Multiply

    1.5×1,000=1,500 g1.5 \times 1{,}000 = 1{,}500\ \text{g}

About the kilograms to grams converter

Kilogram labels are used for luggage allowances, bulk ingredients and body mass. Converting a whole or fractional kilogram into smaller units is useful when a scale or recipe expects a finer denomination. Keep the measurement's original precision instead of assuming every displayed digit was measured.

One kilogram is exactly 1,000 grams, so 1.5 kg is 1,500 g. To convert kg to grams, multiply by 1,000; to convert back, multiply by 0.001.

The gram is one thousandth of a kilogram, the SI base unit of mass. Because both units are defined exactly, the factor above is exact and the results here carry no conversion error.

Worked examples

1.5 kg to g

Kilograms (kg)
1.5 kg
Grams
1,500 g

Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

0.75 kg to g

Kilograms (kg)
0.75 kg
Grams
750 g

Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

5 kg to g

Kilograms (kg)
5 kg
Grams
5,000 g

Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

Questions

How many grams do I weigh out for 1.5 kg?

1.5 kg is 1,500 g. Multiply by 1,000 to express the bulk amount on a gram scale. The decimal part, 0.5 kg, contributes another 500 g; it is not an extra 5 g.

How many grams are in a kilogram?

One kilogram is exactly 1,000 grams. The gram is one thousandth of a kilogram, the SI base unit of mass.

How do you convert kg to grams?

Multiply the number of kilograms by 1,000. For example, 1.5 kg × 1,000 = 1,500 g. To go the other way, divide by 1,000.

How accurate is the kilograms to grams converter?

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “1.5 kg to g” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).

Where does the method come from?

NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.

About this calculator

grams=kilograms×1,000\text{grams} = \text{kilograms} \times 1{,}000

Sources

  1. NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B
  2. NIST Handbook 44, Appendix C: General tables of units of measurement
  3. BIPM, The International System of Units (SI Brochure), 9th edition

Checked against references

3 worked examples with independently sourced answers ship with this calculator. They run in the test suite; you can run them here too.

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