Milligrams to Grams (mg to g) Converter

Milligrams to Grams Conversion

Milligrams and grams are metric units used for tiny quantities: 1 gram equals exactly 1000 milligrams. This conversion is essential for medication, supplements, and nutrition labels.

Conversion formula: 1 g = 1000 mg — divide milligrams by 1000.

When You Need This

Medication dosing — doses are listed in mg
Supplements — vitamins and minerals in mg
Nutrition labels — sodium and sugar shown in mg
Scientific work — converting between metric scales
Jewelry & precision — tiny weights in mg

How to Convert

The Conversion Formula

Divide milligrams by 1000 to get grams, or move the decimal three places to the left. To reverse, multiply grams by 1000.

grams = milligrams ÷ 1000 — for example, 500 mg ÷ 1000 = 0.5 g.

Using the Tool

Enter the value

Type the amount you want to convert into the input field.

Read the result instantly

The converted value appears immediately in the second field — no button to press.

Swap or pick any unit

Press the swap button to reverse direction, or open a dropdown to choose a different unit.

Copy the result

Tap the copy icon next to either field to copy the value for your records.

Worked Examples

Milligrams	Calculation	Grams
100 mg	`100 ÷ 1000`	0.1 g
500 mg	`500 ÷ 1000`	0.5 g
1000 mg	`1000 ÷ 1000`	1 g
2000 mg	`2000 ÷ 1000`	2 g

Features & Use Cases

Tool Capabilities

Instant Two-Way Conversion

Results update as you type. Use the swap button to reverse the direction in one click.

Any Unit, Any Pair

Searchable dropdowns let you switch to grams, ounces, pounds, stone, tons, carats and more — not just the default pair.

Copy & Quick Reference

Copy either value with one tap, and check the built-in reference table for common conversions at a glance.

Common Use Cases

Medication Dosing

Drug doses are written in mg. Convert to grams to total a daily intake or compare strengths across products.

Supplements & Vitamins

Supplement labels list amounts in mg or even mcg. Convert to grams to understand total quantities clearly.

Nutrition Labels

Sodium, sugar, and cholesterol appear in mg. Convert to grams to fit them into a gram-based daily plan.

Science & Precision

Lab and jewelry work measures tiny masses in mg. Convert to grams when a protocol or scale expects gram units.

Runs in your browser: All calculations happen locally on your device. Nothing is uploaded — fast and private.

Frequently Asked Questions

How many milligrams are in a gram?

Exactly 1000 milligrams = 1 gram. "Milli" means one-thousandth.

How do I convert 650 mg to grams?

Divide by 1000: 650 ÷ 1000 = 0.65 g.

Why are medications dosed in milligrams?

Active ingredients are usually present in very small amounts. Milligrams allow precise, safe dosing that grams would round away.

Is 1500 mg the same as 1.5 g?

Yes. 1500 mg = 1.5 g. Move the decimal three places left.

What about micrograms (mcg)?

There are 1000 micrograms in a milligram, so 1,000,000 mcg = 1 g. Some vitamins (like B12) are dosed in mcg.

Can I rely on this for medical dosing?

The math is exact, but always follow your prescription and pharmacist. Use this tool to understand units, not to change a dose.

Milligrams to Grams