Grams to Milligrams (g → mg) — Free Online Converter

g → mg Reference Table

g	mg
0.001 g	1 mg
0.002 g	2 mg
0.003 g	3 mg
0.004 g	4 mg
0.005 g	5 mg
0.006 g	6 mg
0.007 g	7 mg
0.008 g	8 mg
0.009 g	9 mg
0.01 g	10 mg
0.02 g	20 mg
0.03 g	30 mg
0.04 g	40 mg
0.05 g	50 mg
0.06 g	60 mg
0.07 g	70 mg
0.08 g	80 mg
0.09 g	90 mg
0.1 g	100 mg
0.2 g	200 mg
0.3 g	300 mg
0.4 g	400 mg
0.5 g	500 mg
0.6 g	600 mg
0.7 g	700 mg
0.8 g	800 mg
0.9 g	900 mg
1 g	1000 mg
1.5 g	1500 mg
2 g	2000 mg
2.5 g	2500 mg
3 g	3000 mg
3.5 g	3500 mg
4 g	4000 mg
4.5 g	4500 mg
5 g	5000 mg
5.5 g	5500 mg
6 g	6000 mg
6.5 g	6500 mg
7 g	7000 mg
7.5 g	7500 mg
8 g	8000 mg
8.5 g	8500 mg
9 g	9000 mg
9.5 g	9500 mg
10 g	10000 mg
11 g	11000 mg
12 g	12000 mg
13 g	13000 mg
14 g	14000 mg
15 g	15000 mg
16 g	16000 mg
17 g	17000 mg
18 g	18000 mg
19 g	19000 mg
20 g	20000 mg
25 g	25000 mg
30 g	30000 mg
35 g	35000 mg
40 g	40000 mg
45 g	45000 mg
50 g	50000 mg
55 g	55000 mg
60 g	60000 mg
65 g	65000 mg
70 g	70000 mg
75 g	75000 mg
80 g	80000 mg
85 g	85000 mg
90 g	90000 mg
95 g	95000 mg
100 g	100000 mg
120 g	120000 mg
125 g	125000 mg
130 g	130000 mg
140 g	140000 mg
150 g	150000 mg
160 g	160000 mg
175 g	175000 mg
180 g	180000 mg
200 g	200000 mg
225 g	225000 mg
250 g	250000 mg
275 g	275000 mg
300 g	300000 mg
350 g	350000 mg
400 g	400000 mg
450 g	450000 mg
500 g	500000 mg
600 g	600000 mg
700 g	700000 mg
750 g	750000 mg
800 g	800000 mg
900 g	900000 mg
1000 g	1000000 mg
1200 g	1200000 mg
1250 g	1250000 mg
1500 g	1500000 mg
1750 g	1750000 mg
2000 g	2000000 mg
2500 g	2500000 mg
3000 g	3000000 mg
4000 g	4000000 mg
4500 g	4500000 mg
5000 g	5000000 mg
6000 g	6000000 mg
7000 g	7000000 mg
7500 g	7500000 mg
8000 g	8000000 mg
9000 g	9000000 mg
10000 g	10000000 mg
15000 g	15000000 mg
20000 g	20000000 mg
25000 g	25000000 mg
50000 g	50000000 mg
75000 g	75000000 mg
100000 g	100000000 mg

Values based on NIST SP 811 conversion factors

Why Convert Grams to Milligrams?

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

Mass conversions from g 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 Grams to Milligrams

To convert grams to milligrams, use the following formula:

mg = g × 1000

Example: 1 g = 1000 mg

For example, 5 g = 5000 mg, 10 g = 10000 mg, and 100 g = 100000 mg. For larger values, 1000 g = 1000000 mg. Conversely, 1 mg = 0.001 g. 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 Gram?

The gram (g) is a metric unit of mass equal to one-thousandth of a kilogram (0.001 kg). Originally defined as the mass of one cubic centimeter of water at 4°C.

Grams are widely used for small weights in cooking (ingredients), nutrition facts, chemistry, and postal services worldwide.

What is a Milligram?

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

Common in medicine/pharmacy for dosage.

Frequently Asked Questions

How many milligrams are in 1 gram?

1 g equals 1000 mg. This is an exact conversion factor defined by NIST.

How do I convert grams to milligrams?

Multiply the value in g by the conversion factor. For example, 10 g = 10000 mg. Use our calculator above for instant results.

Is the grams to milligrams conversion exact?

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

Can I convert grams 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 grams and milligrams?

Grams (g) and Milligrams (mg) are both units of mass but belong to different measurement systems. 1 g = 1000 mg. Use the converter above to switch between them instantly.

Grams → Milligrams