Femtograms to Carats Converter
Enter the weight in femtograms below to convert it to carats.
Convert Femtograms to Carats
Enter a value in femtograms (fg) to convert to carats (ct).
Femtogram to Metric Carat Conversion Table
Table showing various femtogram measurements converted to carats. Click any preset value or arrow to load it into the converter.
| Femtograms (fg) | Carats (ct) |
|---|---|
| 1 fg | 5e-15 ct |
| 10 fg | 5e-14 ct |
| 100 fg | 5e-13 ct |
| 1,000 fg | 5e-12 ct |
| 10,000 fg | 5e-11 ct |
| 100,000 fg | 5e-10 ct |
| 1,000,000 fg | 5e-9 ct |
| 5,000,000 fg | 0.000000025 ct |
| 10,000,000 fg | 0.00000005 ct |
| 25,400,000 fg | 0.000000127 ct |
How to Convert Femtograms to Carats
To convert femtograms to carats, multiply the weight by the following conversion ratio: 5e-15 carats/femtogram.
Since one femtogram is equal to 5e-15 carats, you can use this simple formula to convert:
The weight in carats is equal to the weight in femtograms multiplied by 5e-15.
For example, here's how to convert 5 femtograms to carats using the formula above.
How Many Carats Are in a Femtogram?
There are 5e-15 carats in a femtogram, which is why we use this value in the formula above.
Our femtogram to metric carat calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Femtograms and carats 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 Metric Carat?
A metric carat is a unit of weight equal to 1/5,000 of a kilogram (0.0002 kg). Gemstone mass unit equal to 0.2 grams (200 mg). [2]
The metric carat is classified as a metric and SI-compatible unit of weight. Carats can be abbreviated as ct; for example, 1 metric carat can be written as 1 ct.
When working with carats (ct) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, carats (ct) 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 femtograms (fg) and carats (ct), keep full floating-point precision (1 fg = 5e-15 ct; 1 ct = 2e+14 fg) during intermediate calculations and round only the final metric carat figure to match your instrument tolerance.
More Femtogram & Carat Conversions
Need to calculate in the opposite direction? Use our carats to femtograms calculator to switch your starting unit immediately. You can also explore related tools such as converting carats to femtograms, converting kilograms to pounds, or converting pounds to kilograms.
Convert from Femtograms
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Femtograms (fg) to Carats (ct)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Femtogram (fg) & Metric Carat (ct)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (fg to ct)