Femtograms to Kilograms Converter
Enter the weight in femtograms below to convert it to kilograms.
Convert Femtograms to Kilograms
Enter a value in femtograms (fg) to convert to kilograms (kg).
Femtogram to Kilogram Conversion Table
Table showing various femtogram measurements converted to kilograms. Click any preset value or arrow to load it into the converter.
How to Convert Femtograms to Kilograms
To convert femtograms to kilograms, multiply the weight by the following conversion ratio: 1e-18 kilograms/femtogram.
Since one femtogram is equal to 1e-18 kilograms, you can use this simple formula to convert:
The weight in kilograms is equal to the weight in femtograms multiplied by 1e-18.
For example, here's how to convert 5 femtograms to kilograms using the formula above.
How Many Kilograms Are in a Femtogram?
There are 1e-18 kilograms in a femtogram, which is why we use this value in the formula above.
Our femtogram to kilogram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Femtograms and kilograms are both units used to measure weight. Keep reading to learn more about each unit.
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. [1]
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.
What Is a Kilogram?
The fundamental SI unit of mass. It serves as a primary reference unit for measuring weight across scientific and practical applications. [2]
The kilogram is classified as an International System of Units (SI) unit of weight. Kilograms can be abbreviated as kg; for example, 1 kilogram can be written as 1 kg.
Although the name "kilogram" begins with the SI prefix "kilo" (1,000 grams), the kilogram (kg) is the sole SI base unit whose definition includes a prefix for historical reasons established by the BIPM.
In practice, kilograms (kg) are widely used across standard weight applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting weight between femtograms (fg) and kilograms (kg), keep full floating-point precision (1 fg = 1e-18 kg; 1 kg = 1e+18 fg) during intermediate calculations and round only the final kilogram figure to match your instrument tolerance.
More Femtogram & Kilogram Conversions
Need to calculate in the opposite direction? Use our kilograms to femtograms calculator to switch your starting unit immediately. You can also explore related tools such as converting kilograms to femtograms, converting pounds to kilograms, or converting grams to kilograms.
Convert from Femtograms
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 — Femtograms (fg) to Kilograms (kg)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Femtogram (fg) & Kilogram (kg)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (fg to kg)