Grams and Kilograms Converter (g to kg & kg to g

Grams (g) to Kilograms (kg) & Decimal SI Metric Prefixes

The gram and kilogram are connected by the metric decimal prefix kilo (10^3):

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• Exact Conversion Formulas (BIPM SI Standard)**:

1 Kilogram (kg) = 1,000 Grams (g) (Exact)

Mass (kg) = Mass (g)1,000 = Mass (g) × 10^-3

Mass (g) = Mass (kg) × 1,000 = Mass (kg) × 10^3

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• Decimal SI Mass Scale Hierarchy**:

• 1 Metric Tonne (t) = 1,000 kg = 1,000,000 g = 10^6 g

• 1 Kilogram (kg) = 1,000 g = 10^3 g

• 1 Hectogram (hg) = 100 g = 10^2 g

• 1 Decagram (dag) = 10 g = 10^1 g

• 1 Gram (g) = 1 g = 10^0 g

• 1 Milligram (mg) = 0.001 g = 10^-3 g

• 1 Microgram (µg) = 0.000001 g = 10^-6 g

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• Standard Global Mass Benchmarks**:

• 1.0 g: Metal paperclip

• 5.0 g: US Nickel coin

• 100.0 g: Medium banana / apple

• 500.0 g: Block of butter / bag of pasta

• 1,000.0 g: 1.0 Liter of pure water at 4^

• 1,400.0 g: Adult human brain (1.4 kg)

How to Use This Calculator

Enter your Mass / Weight Magnitude (e.g. 500 or 2.5 in mass), Conversion Direction — choose from Grams to Kilograms (g → kg: divide by 1,000), Kilograms to Grams (kg → g: multiply by 1,000), and Culinary, Laboratory & Anatomical Benchmark — choose from Custom Mass, Standard Metal Paperclip (1.000 g) → 0.001 kg (1,000 mg), Baking Flour / Pasta Package (500.000 g) → 0.5000 kg (17.64 oz). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Conversion factors (to SI base unit or reference unit):

val: 1.0

maximumFractionDigits: 3

Worked Example

A baker measuring 500 grams of bread flour converts to kilograms: 500 / 1000 = 0.500 kg, allowing quick entry into an inventory stock management system.

Understanding Your Result

Unit conversions are exact by definition within a given measurement system (e.g., 1 km = exactly 1,000 m). Cross-system conversions (metric to imperial) use defined exchange factors: 1 inch = exactly 2.54 cm; 1 pound = 0.45359237 kg. Round your converted result to match the precision of your original measurement — expressing more decimal places than your input justifies implies false accuracy. For regulatory, legal, or safety-critical applications, verify which measurement system is required by the applicable standard.