Micrometers to Femtometers Converter
Enter the length in micrometers below to convert it to femtometers.
Convert Micrometers to Femtometers
Enter a value in micrometers (µm) to convert to femtometers (fm).
Micrometers to Femtometers Conversion Chart (1–40 Continuous)
Continuous 1 to 40 micrometers lookup table with exact decimals and reduced nearest 1/64 fractions. Highlighted rows mark common shop and ruler values.
| Micrometers (µm) | Decimal (fm) | Fraction — Nearest 1/64 (Reduced) | Nearest 1/16 (Tape) |
|---|---|---|---|
1 µm★ Common | 1,000,000,000 fm | 1000000000 fm | 1000000000 fm |
2 µm★ Common | 2,000,000,000 fm | 2000000000 fm | 2000000000 fm |
3 µm★ Common | 3,000,000,000 fm | 3000000000 fm | 3000000000 fm |
4 µm | 4,000,000,000 fm | 4000000000 fm | 4000000000 fm |
5 µm★ Common | 4,999,999,999.999999 fm | 5000000000 fm | 5000000000 fm |
6 µm★ Common | 5,999,999,999.999999 fm | 6000000000 fm | 6000000000 fm |
7 µm | 6,999,999,999.999999 fm | 7000000000 fm | 7000000000 fm |
8 µm★ Common | 7,999,999,999.999999 fm | 8000000000 fm | 8000000000 fm |
9 µm | 8,999,999,999.999998 fm | 9000000000 fm | 9000000000 fm |
10 µm★ Common | 9,999,999,999.999998 fm | 10000000000 fm | 10000000000 fm |
11 µm | 10,999,999,999.999998 fm | 11000000000 fm | 11000000000 fm |
12 µm★ Common | 11,999,999,999.999998 fm | 12000000000 fm | 12000000000 fm |
How to Convert Micrometers to Femtometers
To convert micrometers to femtometers, multiply the length by the following conversion ratio: 999,999,999.9999999 femtometers/micrometer.
Since one micrometer is equal to 999,999,999.9999999 femtometers, you can use this simple formula to convert:
The length in femtometers is equal to the length in micrometers multiplied by 999,999,999.9999999.
For example, here's how to convert 5 micrometers to femtometers using the formula above.
How Many Femtometers Are in a Micrometer?
There are 999,999,999.9999999 femtometers in a micrometer, which is why we use this value in the formula above.
Our micrometer fraction and decimal calculator can convert micrometers and femtometers, and it automatically converts the results to US customary, imperial, and SI metric values.
Micrometers and femtometers are both units used to measure length. Keep reading to learn more about each unit.
How to Convert Micrometers to Fractional Inches (1/16″, 1/32″ & 1/64″)
Plain-language method for turning decimal inches into a standard tape-measure or machinist ruler fraction
Calculators give you a decimal number (such as 0.000197 in), but tape measures and woodworking rulers are marked in binary fractions of an inch—most commonly 1/16″ on carpenter tapes, 1/32″ on fine woodworking rules, and 1/64″ on machinist scales.
Here is the step-by-step worked example for converting 5 micrometers (µm) into fractional inches:
- Find the decimal inches result: Convert 5 µm to inches to get 0.000197 in.
- Separate the whole inches from the decimal part: Keep the whole number 0 aside, leaving the decimal remainder 0.000197.
- Multiply the decimal part by your desired fraction denominator (16, 32, or 64) and round half up: Multiply 0.000197 by 16, 32, or 64, then round to the nearest whole number (values ending in .5 round up).
- Reduce the fraction to lowest terms: If the rounded top number (numerator) is even, divide both top and bottom by 2 (or their Greatest Common Divisor) until the top number is odd, then combine with your whole inches.
What Is a Micrometer?
A micrometer is a unit of length equal to 1/1,000,000 of a meter (0.000001 m). One millionth of a meter (10⁻⁶ m), also known as a micron. [1]
The micrometer is classified as a metric and SI-compatible unit of length. Micrometers can be abbreviated as µm; for example, 1 micrometer can be written as 1 µm.
In the metric system, "micro" is the standard SI prefix for millionths, or 10⁻⁶. This makes the micrometer (µm) a convenient decimal multiple of the meter (m).
In practice, micrometers (µm) are widely used across fine-tolerance laboratory, analytical, and micro-scale length measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Femtometer?
A femtometer is a unit of length equal to 1e-15 meters (m), the base unit for length. One quadrillionth of a meter (10⁻¹⁵ m), used in nuclear physics. [2]
The femtometer is classified as a metric and SI-compatible unit of length. Femtometers can be abbreviated as fm; for example, 1 femtometer can be written as 1 fm.
In the metric system, "femto" is the standard SI prefix for quadrillionths, or 10⁻¹⁵. This makes the femtometer (fm) a convenient decimal multiple of the meter (m).
In practice, femtometers (fm) are widely used across fine-tolerance laboratory, analytical, and micro-scale length measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting length between micrometers (µm) and femtometers (fm), keep full floating-point precision (1 µm = 999,999,999.9999999 fm; 1 fm = 1e-9 µm) during intermediate calculations and round only the final femtometer figure to match your instrument tolerance.
More Micrometer & Femtometer Conversions
Need to calculate in the opposite direction? Use our femtometers to micrometers calculator to switch your starting unit immediately. You can also explore related tools such as converting femtometers to micrometers, converting micrometers to millimeters, or converting micrometers to inches.
Convert from Micrometers
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Length Metrology Standard — Micrometers (µm) to Femtometers (fm)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Micrometer (Micron) (µm) & Femtometer (Fermi) (fm)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (µm to fm)