Convert Milligram to Exagram
Convert milligrams to exagrams instantly. 1 milligram = 1e-21 exagram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Exagram to Milligram converter for the reverse conversion.
Units explained
Milligram
A milligram (mg) equals one-millionth of a kilogram, or 0.001 gram.
From the SI prefix 'milli-' (from Latin 'mille', thousand).
Standard for medicine dosing, nutrition labels, and fine jewelry.
Part of the original metric system of 1795.
Exagram
An exagram (Eg) equals 10^15 kilograms, or one quintillion grams.
From the SI prefix 'exa-' (from Greek 'hex', six, denoting the sixth power of 1000).
Confined to planetary- and atmospheric-scale mass discussions; never used in daily measurement.
The exa- prefix was adopted by the General Conference on Weights and Measures (CGPM) in 1975.
Milligram to Exagram conversion formula
The relationship between milligrams and exagrams:
To convert milligrams to exagrams, multiply the value in milligrams by 1e-21. To reverse, multiply exagrams by 1e+21.
How to use this converter
Type a value into the calculator. The result in exagrams updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Exagram to Milligram converter for the reverse direction.
Step-by-step: convert milligrams to exagrams
- Write down the value in milligrams (mg).
- Multiply that value by the factor 1e-21.
- The product is the equivalent value in exagrams (Eg).
- To reverse, multiply the exagram value by 1e+21.
Worked examples
Example 1 — Convert 1 mg to Eg:
1 × 1e-21 = 1e-21 Eg
Example 2 — Convert 100 mg to Eg:
100 × 1e-21 = 1e-19 Eg
Real-world example — Hair-width scale measurements
A 70-milligram measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like exagrams for direct comparison across supplier datasheets.
70 mg × 1e-21 = 7e-20 Eg
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 milligrams), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 mg × 1e-21 = 3e-21 Eg
Real-world example — Plastic-film thickness alternates
A 150-milligram plastic film converts cleanly to exagrams — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 mg × 1e-21 = 1.5e-19 Eg
Milligram to Exagram conversion table
Standard reference values for converting milligrams to exagrams:
| Milligram [mg] | Exagram [Eg] |
|---|---|
| 0.01 | 1e-23 |
| 0.1 | 1e-22 |
| 1 | 1e-21 |
| 2 | 2e-21 |
| 3 | 3e-21 |
| 4 | 4e-21 |
| 5 | 5e-21 |
| 10 | 1e-20 |
| 20 | 2e-20 |
| 30 | 3e-20 |
| 40 | 4e-20 |
| 50 | 5e-20 |
| 100 | 1e-19 |
| 500 | 5e-19 |
| 1000 | 1e-18 |
Frequently asked questions
How many exagrams is 1 milligram?
How do I convert milligrams to exagrams?
How do I convert exagrams back to milligrams?
How many exagrams is 100 milligrams?
Popular weight unit conversions
Convert Milligram to other weight units
Show all Milligram conversions
Metric / SI (17 units)
Avoirdupois (15 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 mg = 1e-21 Eg) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.