How many kilograms are in 1 milligram?

1 mg equals 0.000001 kg. This is an exact conversion factor defined by NIST.

How do I convert milligrams to kilograms?

Multiply the value in mg by the conversion factor. For example, 10 mg = 0.00001 kg. Use our calculator above for instant results.

Is the milligrams to kilograms conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert milligrams to kilograms offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between milligrams and kilograms?

Milligrams (mg) and Kilograms (kg) are both units of mass but belong to different measurement systems. 1 mg = 0.000001 kg. Use the converter above to switch between them instantly.

Milligrams to Kilograms (mg → kg) — Free Online Converter

mg → kg Reference Table

mg	kg
0.001 mg	1.000000e-9 kg
0.002 mg	2.000000e-9 kg
0.003 mg	3.000000e-9 kg
0.004 mg	4.000000e-9 kg
0.005 mg	5.000000e-9 kg
0.006 mg	6.000000e-9 kg
0.007 mg	7.000000e-9 kg
0.008 mg	8.000000e-9 kg
0.009 mg	9.000000e-9 kg
0.01 mg	1e-8 kg
0.02 mg	2e-8 kg
0.03 mg	3e-8 kg
0.04 mg	4e-8 kg
0.05 mg	5e-8 kg
0.06 mg	6e-8 kg
0.07 mg	7e-8 kg
0.08 mg	8e-8 kg
0.09 mg	9e-8 kg
0.1 mg	1e-7 kg
0.2 mg	2e-7 kg
0.3 mg	3e-7 kg
0.4 mg	4e-7 kg
0.5 mg	5e-7 kg
0.6 mg	6e-7 kg
0.7 mg	7e-7 kg
0.8 mg	8e-7 kg
0.9 mg	9e-7 kg
1 mg	0.000001 kg
1.5 mg	0.0000015 kg
2 mg	0.000002 kg
2.5 mg	0.0000025 kg
3 mg	0.000003 kg
3.5 mg	0.0000035 kg
4 mg	0.000004 kg
4.5 mg	0.0000045 kg
5 mg	0.000005 kg
5.5 mg	0.0000055 kg
6 mg	0.000006 kg
6.5 mg	0.0000065 kg
7 mg	0.000007 kg
7.5 mg	0.0000075 kg
8 mg	0.000008 kg
8.5 mg	0.0000085 kg
9 mg	0.000009 kg
9.5 mg	0.0000095 kg
10 mg	0.00001 kg
11 mg	0.000011 kg
12 mg	0.000012 kg
13 mg	0.000013 kg
14 mg	0.000014 kg
15 mg	0.000015 kg
16 mg	0.000016 kg
17 mg	0.000017 kg
18 mg	0.000018 kg
19 mg	0.000019 kg
20 mg	0.00002 kg
25 mg	0.000025 kg
30 mg	0.00003 kg
35 mg	0.000035 kg
40 mg	0.00004 kg
45 mg	0.000045 kg
50 mg	0.00005 kg
55 mg	0.000055 kg
60 mg	0.00006 kg
65 mg	0.000065 kg
70 mg	0.00007 kg
75 mg	0.000075 kg
80 mg	0.00008 kg
85 mg	0.000085 kg
90 mg	0.00009 kg
95 mg	0.000095 kg
100 mg	0.0001 kg
120 mg	0.00012 kg
125 mg	0.000125 kg
130 mg	0.00013 kg
140 mg	0.00014 kg
150 mg	0.00015 kg
160 mg	0.00016 kg
175 mg	0.000175 kg
180 mg	0.00018 kg
200 mg	0.0002 kg
225 mg	0.000225 kg
250 mg	0.00025 kg
275 mg	0.000275 kg
300 mg	0.0003 kg
350 mg	0.00035 kg
400 mg	0.0004 kg
450 mg	0.00045 kg
500 mg	0.0005 kg
600 mg	0.0006 kg
700 mg	0.0007 kg
750 mg	0.00075 kg
800 mg	0.0008 kg
900 mg	0.0009 kg
1000 mg	0.001 kg
1200 mg	0.0012 kg
1250 mg	0.00125 kg
1500 mg	0.0015 kg
1750 mg	0.00175 kg
2000 mg	0.002 kg
2500 mg	0.0025 kg
3000 mg	0.003 kg
4000 mg	0.004 kg
4500 mg	0.0045 kg
5000 mg	0.005 kg
6000 mg	0.006 kg
7000 mg	0.007 kg
7500 mg	0.0075 kg
8000 mg	0.008 kg
9000 mg	0.009 kg
10000 mg	0.01 kg
15000 mg	0.015 kg
20000 mg	0.02 kg
25000 mg	0.025 kg
50000 mg	0.05 kg
75000 mg	0.075 kg
100000 mg	0.1 kg

Values based on NIST SP 811 conversion factors

Why Convert Milligrams to Kilograms?

Converting between milligrams (mg) and kilograms (kg) is one of the most common mass conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert mg to kg saves time and prevents errors.

Mass conversions from mg to kg are vital in culinary arts, logistics, and pharmaceutical industries. Professional chefs and home bakers rely on precise ingredient conversions to replicate international recipes — a slight variation in flour or leavening agents can ruin the texture of a dish. In global shipping, freight costs and vehicle load limits depend on accurate weight calculations to ensure safety and compliance with transport regulations. Furthermore, in healthcare and chemistry, dosage calculations must be exact; confusing mass units can lead to ineffective treatments or dangerous overdoses. Reliable mass conversion ensures consistency across borders and disciplines.

How to Convert Milligrams to Kilograms

To convert milligrams to kilograms, use the following formula:

kg = mg × 0.000001

Example: 1 mg = 0.000001 kg

For example, 5 mg = 0.000005 kg, 10 mg = 0.00001 kg, and 100 mg = 0.0001 kg. For larger values, 1000 mg = 0.001 kg. Conversely, 1 kg = 1000000 mg. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

Mass vs Weight: confusing mass (kg) with weight/force (Newtons or lbs-force).
Ton variations: mixing up Short Ton (US), Long Ton (UK), and Metric Tonne.
Ounce confusion: confusing Ounces (weight) with Fluid Ounces (volume).

Pro Tips

Kitchen scales: Use the 'Tare' button to zero out container weight.
Water weight: 1 Liter of water weighs exactly 1 kg (at 4°C). Useful benchmark.
Conversion rule: To get kg from lbs, divide by 2.2 (approx halve it).

What is a Milligram?

A metric unit of mass equal to 1/1000 of a gram.

Common in medicine/pharmacy for dosage.

What is a Kilogram?

The kilogram (kg) is the base unit of mass in the International System of Units (SI). Originally defined by a platinum-iridium artifact, since 2019 it is defined by the Planck constant (h) set to 6.62607015×10⁻³⁴ J⋅s.

Kilograms are the global standard for measuring mass and weight in science, commerce, and daily life (body weight, groceries). Used nearly everywhere except the US.

Milligrams → Kilograms

Milligrams to Kilograms Formula