20 grams (g) is equal to 20,000 milligrams (mg).
To convert grams to milligrams, you multiply the number of grams by 1,000 because one gram contains exactly 1,000 milligrams. So, for 20 grams, you multiply 20 by 1,000 to get 20,000 mg.
Conversion Tool
Result in mg:
Conversion Formula
The conversion formula between grams and milligrams is:
milligrams = grams × 1000
This works because 1 gram equals 1000 milligrams, so multiplying the gram value by 1000 converts it to milligrams. For example, if you have 5 grams:
- 5 g × 1000 = 5000 mg
- You multiply the gram value by 1000 because milligrams are smaller units.
- This means each gram contains 1000 mg inside it.
Conversion Example
- Convert 7.5 grams to milligrams:
- Step 1: Multiply 7.5 by 1000
- Step 2: 7.5 × 1000 = 7500
- Result: 7.5 g = 7500 mg
- Convert 0.2 grams to milligrams:
- Step 1: Multiply 0.2 by 1000
- Step 2: 0.2 × 1000 = 200
- Result: 0.2 g = 200 mg
- Convert 15 grams to milligrams:
- Step 1: Multiply 15 by 1000
- Step 2: 15 × 1000 = 15000
- Result: 15 g = 15000 mg
- Convert 3 grams to milligrams:
- Step 1: Multiply 3 by 1000
- Step 2: 3 × 1000 = 3000
- Result: 3 g = 3000 mg
Conversion Chart
| Grams (g) | Milligrams (mg) |
|---|---|
| -5.0 | -5000 |
| -4.0 | -4000 |
| -3.0 | -3000 |
| -2.0 | -2000 |
| -1.0 | -1000 |
| 0.0 | 0 |
| 5.0 | 5000 |
| 10.0 | 10000 |
| 15.0 | 15000 |
| 20.0 | 20000 |
| 25.0 | 25000 |
| 30.0 | 30000 |
| 35.0 | 35000 |
| 40.0 | 40000 |
| 45.0 | 45000 |
This chart shows the equivalent milligram values for gram amounts from -5.0 to 45.0. To use the chart, find the gram value in the left column and read the corresponding milligrams in the right column. Negative values indicate negative mass quantities.
Related Conversion Questions
- How many milligrams are in 20 grams exactly?
- What is the formula to convert 20 g to mg?
- Can you convert 20 grams to milligrams without a calculator?
- Why does multiplying 20 grams by 1000 give milligrams?
- How much is 20 grams in mg for medication dosing?
- Is 20 g equal to 20,000 mg or a different number?
- What happens if you convert 20 grams to mg incorrectly?
Conversion Definitions
g (Gram): The gram is a unit of mass in the metric system, equal to one thousandth of a kilogram. It is used worldwide for measuring small weights, especially in science, cooking, and commerce. One gram is about the mass of a paperclip.
mg (Milligram): The milligram is a metric unit of mass equal to one thousandth of a gram. It is commonly used to measure very small weights, such as in pharmaceutical dosages or nutritional information. One milligram is extremely light, about the weight of a grain of sand.
Conversion FAQs
Can I convert grams to milligrams by dividing instead of multiplying?
No, grams convert to milligrams by multiplying by 1000 because milligrams are smaller units. Dividing would give incorrect results, making the value smaller rather than larger. Always multiply grams by 1000 to get milligrams.
Why are negative gram values shown in the chart?
Negative gram values are included for mathematical completeness, representing theoretical or accounting purposes where mass might be considered negative. In practical terms, negative mass isn’t physically meaningful, but the chart shows them for consistency in calculations.
Is the conversion between grams and milligrams exact?
Yes, the conversion is exact because 1 gram equals 1000 milligrams by definition. There is no rounding or approximation in the conversion itself, although calculations might show decimals if input values are fractional.
Does this conversion method apply for other units like kilograms or micrograms?
The method of multiplying by a factor depends on the unit sizes. For kilograms to milligrams, you multiply by 1,000,000, since 1 kg = 1,000,000 mg. For micrograms, you’d divide or multiply by different factors. The principle is the same, but the multiplier changes.
Can I use the provided conversion tool for negative values?
Yes, the tool accepts negative numbers, which mathematically converts negative grams to negative milligrams. However, in real-world scenarios, negative mass is not physical, so use negative inputs cautiously.