Milligrams to Femtograms Converter
Enter the weight in milligrams below to convert it to femtograms.
Convert Milligrams to Femtograms
Enter a value in milligrams (mg) to convert to femtograms (fg).
Milligram to Femtogram Conversion Table
Table showing various milligram measurements converted to femtograms. Click any preset value or arrow to load it into the converter.
| Milligrams (mg) | Femtograms (fg) |
|---|---|
| 0.0000001 mg | 100,000 fg |
| 0.0000002 mg | 200,000 fg |
| 0.0000003 mg | 300,000 fg |
| 0.0000004 mg | 400,000 fg |
| 0.0000005 mg | 500,000 fg |
| 0.0000006 mg | 600,000 fg |
| 0.0000007 mg | 700,000 fg |
| 0.0000008 mg | 800,000 fg |
| 0.0000009 mg | 900,000 fg |
| 0.00000001 mg | 10,000 fg |
How to Convert Milligrams to Femtograms
To convert milligrams to femtograms, multiply the weight by the following conversion ratio: 999,999,999,999.9999 femtograms/milligram.
Since one milligram is equal to 999,999,999,999.9999 femtograms, you can use this simple formula to convert:
The weight in femtograms is equal to the weight in milligrams multiplied by 999,999,999,999.9999.
For example, here's how to convert 5 milligrams to femtograms using the formula above.
How Many Femtograms Are in a Milligram?
There are 999,999,999,999.9999 femtograms in a milligram, which is why we use this value in the formula above.
Our milligram to femtogram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milligrams and femtograms are both units used to measure weight. Keep reading to learn more about each unit.
What Is a Milligram?
A milligram is a unit of weight equal to 1/1,000,000 of a kilogram (0.000001 kg). One-thousandth of a gram (10⁻⁶ kg). [1]
The milligram is classified as a metric and SI-compatible unit of weight. Milligrams can be abbreviated as mg; for example, 1 milligram can be written as 1 mg.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milligram (mg) a convenient decimal multiple of the gram (g).
In practice, milligrams (mg) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Femtogram?
A femtogram is a unit of weight equal to 1/999,999,999,999,999,900 of a kilogram (1e-18 kg). 10⁻¹⁸ kilograms. [2]
The femtogram is classified as a metric and SI-compatible unit of weight. Femtograms can be abbreviated as fg; for example, 1 femtogram can be written as 1 fg.
In the metric system, "femto" is the standard SI prefix for quadrillionths, or 10⁻¹⁵. This makes the femtogram (fg) a convenient decimal multiple of the gram (g).
In practice, femtograms (fg) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting weight between milligrams (mg) and femtograms (fg), keep full floating-point precision (1 mg = 999,999,999,999.9999 fg; 1 fg = 1e-12 mg) during intermediate calculations and round only the final femtogram figure to match your instrument tolerance.
More Milligram & Femtogram Conversions
Need to calculate in the opposite direction? Use our femtograms to milligrams calculator to switch your starting unit immediately. You can also explore related tools such as converting femtograms to milligrams, converting milligrams to grams, or converting milligrams to micrograms.
Convert from Milligrams
Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Milligrams (mg) to Femtograms (fg)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Milligram (mg) & Femtogram (fg)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (mg to fg)