Carats to Femtograms Converter
Enter the weight in carats below to convert it to femtograms.
Convert Carats to Femtograms
Enter a value in carats (ct) to convert to femtograms (fg).
Metric Carat to Femtogram Conversion Table
Table showing various metric carat measurements converted to femtograms. Click any preset value or arrow to load it into the converter.
| Carats (ct) | Femtograms (fg) |
|---|---|
| 0.0000001 ct | 20,000,000 fg |
| 0.0000002 ct | 40,000,000 fg |
| 0.0000003 ct | 60,000,000 fg |
| 0.0000004 ct | 80,000,000 fg |
| 0.0000005 ct | 100,000,000 fg |
| 0.0000006 ct | 120,000,000 fg |
| 0.0000007 ct | 140,000,000 fg |
| 0.0000008 ct | 160,000,000 fg |
| 0.0000009 ct | 180,000,000 fg |
| 0.00000001 ct | 2,000,000 fg |
How to Convert Carats to Femtograms
To convert carats to femtograms, multiply the weight by the following conversion ratio: 2e+14 femtograms/metric carat.
Since one metric carat is equal to 2e+14 femtograms, you can use this simple formula to convert:
The weight in femtograms is equal to the weight in carats multiplied by 2e+14.
For example, here's how to convert 5 carats to femtograms using the formula above.
How Many Femtograms Are in a Metric Carat?
There are 2e+14 femtograms in a metric carat, which is why we use this value in the formula above.
Our metric carat to femtogram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Carats and femtograms are both units used to measure weight. Keep reading to learn more about each unit.
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). [1]
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.
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 carats (ct) and femtograms (fg), keep full floating-point precision (1 ct = 2e+14 fg; 1 fg = 5e-15 ct) during intermediate calculations and round only the final femtogram figure to match your instrument tolerance.
More Carat & Femtogram Conversions
Need to calculate in the opposite direction? Use our femtograms to carats calculator to switch your starting unit immediately. You can also explore related tools such as converting femtograms to carats, converting carats to grams, or converting kilograms to pounds.
Convert from Carats
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Carats (ct) to Femtograms (fg)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Metric Carat (ct) & Femtogram (fg)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (ct to fg)