A Milliwatt (mW) equals 1/1,000 watt(s), a scaled unit of electrical power used for milli-scale electrical work.
Milliwatts to Femtowatts
Convert Milliwatt (mW) to Femtowatt (fW) instantly with an exact formula, conversion table, and FAQ.
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Convert milliwatts (mW) to femtowatts (fW) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A Femtowatt (fW) equals 1e-15 watt(s), a scaled unit of electrical power used for femto-scale electrical work.
fW = mW × 1.000000e+12
Results update instantly for Milliwatts to Femtowatts conversions.
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Formula
fW = mW × 1.000000e+12
mW = fW × 1.000000e-12
Conversion table
| 1 mW | 1.000000e+12 fW |
| 5 mW | 5.000000e+12 fW |
| 10 mW | 1.000000e+13 fW |
| 20 mW | 2.000000e+13 fW |
| 50 mW | 5.000000e+13 fW |
| 100 mW | 1.000000e+14 fW |
| 500 mW | 5.000000e+14 fW |
| 1000 mW | 1.000000e+15 fW |
Related conversions
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How the formula works
Both milliwatt and femtowatt measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in milliwatts by 1.000000e+12 to get femtowatts. To reverse the conversion, multiply a femtowatt value by 1.000000e-12 to get back to milliwatts.
Frequently asked questions
What is Milliwatt (mW)?
A Milliwatt (mW) equals 1/1,000 watt(s), a scaled unit of electrical power used for milli-scale electrical work.
What is Femtowatt (fW)?
A Femtowatt (fW) equals 1e-15 watt(s), a scaled unit of electrical power used for femto-scale electrical work.
How do I convert milliwatts to femtowatts?
Multiply the milliwatt value by 1.000000e+12 to get the equivalent in femtowatts. For example, 5 mW × 1.000000e+12 = 5.000000e+12 fW.
Is this conversion exact?
Yes. Both units use fixed, defined scale factors, so the factor 1.000000e+12 is an exact, non-rounded value.
Can I convert femtowatts back to milliwatts?
Yes. Divide the femtowatt value by 1.000000e+12, or multiply it by 1.000000e-12, to get milliwatts.
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About converting milliwatts to femtowatts
A Milliwatt (mW) equals 1/1,000 watt(s), a scaled unit of electrical power used for milli-scale electrical work. A Femtowatt (fW) equals 1e-15 watt(s), a scaled unit of electrical power used for femto-scale electrical work.
Use this calculator to move between milliwatts and femtowatts accurately for homework, engineering, billing, or everyday electricity calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.