How do I convert mg to kg?

Use the formula shown above or enter a value to see mg converted to kg instantly.

What is the formula for mg to kg?

The converter calculates kg by applying the category-specific conversion factor for Mass.

When should I use mg vs kg?

mg and kg are both part of the Mass category; pick the unit that matches your measurement context (e.g., scale, region, or industry standard).

Mass Converter & Reference

Convert mg to kg

Use the live converter below to translate between Milligram (mg) and Kilogram (kg). Scroll further for quick examples, formula tips, and related units.

Formula insight: Most unit conversions use a simple multiplication or division by a conversion factor. The calculator shows the exact formula used.

Convert

mg → kg

Milligram

Kilogram

Rounded result (4 decimals max)

Formula

1 mg = 0 kg

Conversion sourcesTap or click to view references

The International System of Units (SI) — NIST Special Publication 330
National Institute of Standards and Technology (NIST). The SI Brochure (SP 330) is the definitive English edition of the BIPM SI tables. NIST’s edition lists the official constants and conversion factors tying inch-pound units to SI, which SwapUnits applies for length, mass, temperature, pressure, volume, and related conversions. See /standards/nist-si-tenfold for the complete decimal multiple/submultiple table. View source · View SI table

Results update as you type. Swap the direction to convert back from kg to mg.

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mg to kg quick table

Multiply any row by the same factor to scale results. Use the converter above to enter exact values with your own units.

Milligram (mg)	Kilogram (kg)
0.25 mg	0 kg
0.5 mg	0 kg
1 mg	0 kg
2 mg	0 kg
5 mg	0 kg
10 mg	0 kg
25 mg	0 kg
100 mg	0.0001 kg

kg back to mg

Keep the reciprocal handy when double-checking calculations or undoing a conversion.

Kilogram (kg)	Milligram (mg)
0.25 kg	250,000 mg
0.5 kg	500,000 mg
1 kg	1,000,000 mg
2 kg	2,000,000 mg
5 kg	5,000,000 mg
10 kg	10,000,000 mg
25 kg	25,000,000 mg
100 kg	100,000,000 mg

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