Centimeters to Femtometers Converter
Enter the length in centimeters below to convert it to femtometers.
Convert Centimeters to Femtometers
Enter a value in centimeters (cm) to convert to femtometers (fm).
Centimeters to Femtometers Conversion Chart (1–40 Continuous)
Continuous 1 to 40 centimeters lookup table with exact decimals and reduced nearest 1/64 fractions. Highlighted rows mark common shop and ruler values.
| Centimeters (cm) | Decimal (fm) | Fraction — Nearest 1/64 (Reduced) | Nearest 1/16 (Tape) |
|---|---|---|---|
1 cm★ Common | 10,000,000,000,000 fm | 10000000000000 fm | 10000000000000 fm |
2 cm★ Common | 20,000,000,000,000 fm | 20000000000000 fm | 20000000000000 fm |
3 cm★ Common | 30,000,000,000,000 fm | 30000000000000 fm | 30000000000000 fm |
4 cm | 40,000,000,000,000 fm | 40000000000000 fm | 40000000000000 fm |
5 cm★ Common | 50,000,000,000,000 fm | 50000000000000 fm | 50000000000000 fm |
6 cm★ Common | 60,000,000,000,000 fm | 60000000000000 fm | 60000000000000 fm |
7 cm | 70,000,000,000,000 fm | 70000000000000 fm | 70000000000000 fm |
8 cm★ Common | 80,000,000,000,000 fm | 80000000000000 fm | 80000000000000 fm |
9 cm | 90,000,000,000,000 fm | 90000000000000 fm | 90000000000000 fm |
10 cm★ Common | 100,000,000,000,000 fm | 100000000000000 fm | 100000000000000 fm |
11 cm | 110,000,000,000,000 fm | 110000000000000 fm | 110000000000000 fm |
12 cm★ Common | 120,000,000,000,000 fm | 120000000000000 fm | 120000000000000 fm |
How to Convert Centimeters to Femtometers
To convert centimeters to femtometers, multiply the length by the following conversion ratio: 1e+13 femtometers/centimeter.
Since one centimeter is equal to 1e+13 femtometers, you can use this simple formula to convert:
The length in femtometers is equal to the length in centimeters multiplied by 1e+13.
For example, here's how to convert 5 centimeters to femtometers using the formula above.
How Many Femtometers Are in a Centimeter?
There are 1e+13 femtometers in a centimeter, which is why we use this value in the formula above.
Our centimeter fraction and decimal calculator can convert centimeters and femtometers, and it automatically converts the results to US customary, imperial, and SI metric values.
Centimeters and femtometers are both units used to measure length. Keep reading to learn more about each unit.
How to Convert Centimeters 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 1.968504 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 centimeters (cm) into fractional inches:
- Find the decimal inches result: Convert 5 cm to inches to get 1.968504 in.
- Separate the whole inches from the decimal part: Keep the whole number 1 aside, leaving the decimal remainder 0.968504.
- Multiply the decimal part by your desired fraction denominator (16, 32, or 64) and round half up: Multiply 0.968504 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 Centimeter?
A centimeter is a metric unit of length equal to one-hundredth (1/100) of a meter, which is the International System of Units (SI) base unit of length. One centimeter is also equal to 10 millimeters or approximately 0.39370079 inches. [1]
The centimeter, or centimetre, is part of the SI metric system used worldwide for everyday, scientific, and clinical measurements. Centimeters can be abbreviated as cm; for example, 1 centimeter can be written as 1 cm.
In the metric system, "centi" is the Latin-derived prefix for hundredths, or 10⁻². Because 1 international inch is legally defined as 2.54 centimeters, converting between centimeters and inches is anchored by an exact mathematical constant.
Centimeters are measured using metric rulers, tailor's measuring tapes, stadiometers (for human height), and vernier calipers across carpentry, apparel sizing, school science, and medical charts.
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 centimeters (cm) and femtometers (fm), keep full floating-point precision (1 cm = 1e+13 fm; 1 fm = 1e-13 cm) during intermediate calculations and round only the final femtometer figure to match your instrument tolerance.
More Centimeter & Femtometer Conversions
Need to calculate in the opposite direction? Use our femtometers to centimeters calculator to switch your starting unit immediately. You can also explore related tools such as converting femtometers to centimeters, converting centimeters to inches, or converting centimeters to feet.
Convert from Centimeters
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Length Metrology Standard — Centimeters (cm) to Femtometers (fm)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Centimeter (cm) & Femtometer (Fermi) (fm)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (cm to fm)