How many milligrams are in 1 kilogram?

1 kg equals 1000000 mg. This is an exact conversion factor defined by NIST.

How do I convert kilograms to milligrams?

Multiply the value in kg by the conversion factor. For example, 10 kg = 10000000 mg. Use our calculator above for instant results.

Is the kilograms to milligrams conversion exact?

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

Can I convert kilograms to milligrams 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 kilograms and milligrams?

Kilograms (kg) and Milligrams (mg) are both units of mass but belong to different measurement systems. 1 kg = 1000000 mg. Use the converter above to switch between them instantly.

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

kg → mg Reference Table

kg	mg
0.001 kg	1000 mg
0.002 kg	2000 mg
0.003 kg	3000 mg
0.004 kg	4000 mg
0.005 kg	5000 mg
0.006 kg	6000 mg
0.007 kg	7000 mg
0.008 kg	8000 mg
0.009 kg	9000 mg
0.01 kg	10000 mg
0.02 kg	20000 mg
0.03 kg	30000 mg
0.04 kg	40000 mg
0.05 kg	50000 mg
0.06 kg	60000 mg
0.07 kg	70000 mg
0.08 kg	80000 mg
0.09 kg	90000 mg
0.1 kg	100000 mg
0.2 kg	200000 mg
0.3 kg	300000 mg
0.4 kg	400000 mg
0.5 kg	500000 mg
0.6 kg	600000 mg
0.7 kg	700000 mg
0.8 kg	800000 mg
0.9 kg	900000 mg
1 kg	1000000 mg
1.5 kg	1500000 mg
2 kg	2000000 mg
2.5 kg	2500000 mg
3 kg	3000000 mg
3.5 kg	3500000 mg
4 kg	4000000 mg
4.5 kg	4500000 mg
5 kg	5000000 mg
5.5 kg	5500000 mg
6 kg	6000000 mg
6.5 kg	6500000 mg
7 kg	7000000 mg
7.5 kg	7500000 mg
8 kg	8000000 mg
8.5 kg	8500000 mg
9 kg	9000000 mg
9.5 kg	9500000 mg
10 kg	10000000 mg
11 kg	11000000 mg
12 kg	12000000 mg
13 kg	13000000 mg
14 kg	14000000 mg
15 kg	15000000 mg
16 kg	16000000 mg
17 kg	17000000 mg
18 kg	18000000 mg
19 kg	19000000 mg
20 kg	20000000 mg
25 kg	25000000 mg
30 kg	30000000 mg
35 kg	35000000 mg
40 kg	40000000 mg
45 kg	45000000 mg
50 kg	50000000 mg
55 kg	55000000 mg
60 kg	60000000 mg
65 kg	65000000 mg
70 kg	70000000 mg
75 kg	75000000 mg
80 kg	80000000 mg
85 kg	85000000 mg
90 kg	90000000 mg
95 kg	95000000 mg
100 kg	100000000 mg
120 kg	120000000 mg
125 kg	125000000 mg
130 kg	130000000 mg
140 kg	140000000 mg
150 kg	150000000 mg
160 kg	160000000 mg
175 kg	175000000 mg
180 kg	180000000 mg
200 kg	200000000 mg
225 kg	225000000 mg
250 kg	250000000 mg
275 kg	275000000 mg
300 kg	300000000 mg
350 kg	350000000 mg
400 kg	400000000 mg
450 kg	450000000 mg
500 kg	500000000 mg
600 kg	600000000 mg
700 kg	700000000 mg
750 kg	750000000 mg
800 kg	800000000 mg
900 kg	900000000 mg
1000 kg	1000000000 mg
1200 kg	1200000000 mg
1250 kg	1250000000 mg
1500 kg	1500000000 mg
1750 kg	1750000000 mg
2000 kg	2000000000 mg
2500 kg	2500000000 mg
3000 kg	3000000000 mg
4000 kg	4000000000 mg
4500 kg	4500000000 mg
5000 kg	5000000000 mg
6000 kg	6000000000 mg
7000 kg	7000000000 mg
7500 kg	7500000000 mg
8000 kg	8000000000 mg
9000 kg	9000000000 mg
10000 kg	10000000000 mg
15000 kg	15000000000 mg
20000 kg	20000000000 mg
25000 kg	25000000000 mg
50000 kg	50000000000 mg
75000 kg	75000000000 mg
100000 kg	100000000000 mg

Values based on NIST SP 811 conversion factors

Why Convert Kilograms to Milligrams?

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

Mass conversions from kg to mg 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 Kilograms to Milligrams

To convert kilograms to milligrams, use the following formula:

mg = kg × 1000000

Example: 1 kg = 1000000 mg

For example, 5 kg = 5000000 mg, 10 kg = 10000000 mg, and 100 kg = 100000000 mg. For larger values, 1000 kg = 1000000000 mg. Conversely, 1 mg = 0.000001 kg. 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 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.

What is a Milligram?

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

Common in medicine/pharmacy for dosage.

Kilograms → Milligrams

Kilograms to Milligrams Formula