A Milliwatt (mW) equals 1/1,000 watt(s), a scaled unit of electrical power used for milli-scale electrical work.
Milliwatts to Zeptowatts
Convert Milliwatt (mW) to Zeptowatt (zW) instantly with an exact formula, conversion table, and FAQ.
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Convert milliwatts (mW) to zeptowatts (zW) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A Zeptowatt (zW) equals 1e-21 watt(s), a scaled unit of electrical power used for zepto-scale electrical work.
zW = mW × 1.000000e+18
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Formula
zW = mW × 1.000000e+18
mW = zW × 1.000000e-18
Conversion table
| 1 mW | 1.000000e+18 zW |
| 5 mW | 5.000000e+18 zW |
| 10 mW | 1.000000e+19 zW |
| 20 mW | 2.000000e+19 zW |
| 50 mW | 5.000000e+19 zW |
| 100 mW | 1.000000e+20 zW |
| 500 mW | 5.000000e+20 zW |
| 1000 mW | 1.000000e+21 zW |
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How the formula works
Both milliwatt and zeptowatt measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in milliwatts by 1.000000e+18 to get zeptowatts. To reverse the conversion, multiply a zeptowatt value by 1.000000e-18 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 Zeptowatt (zW)?
A Zeptowatt (zW) equals 1e-21 watt(s), a scaled unit of electrical power used for zepto-scale electrical work.
How do I convert milliwatts to zeptowatts?
Multiply the milliwatt value by 1.000000e+18 to get the equivalent in zeptowatts. For example, 5 mW × 1.000000e+18 = 5.000000e+18 zW.
Is this conversion exact?
Yes. Both units use fixed, defined scale factors, so the factor 1.000000e+18 is an exact, non-rounded value.
Can I convert zeptowatts back to milliwatts?
Yes. Divide the zeptowatt value by 1.000000e+18, or multiply it by 1.000000e-18, to get milliwatts.
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About converting milliwatts to zeptowatts
A Milliwatt (mW) equals 1/1,000 watt(s), a scaled unit of electrical power used for milli-scale electrical work. A Zeptowatt (zW) equals 1e-21 watt(s), a scaled unit of electrical power used for zepto-scale electrical work.
Use this calculator to move between milliwatts and zeptowatts accurately for homework, engineering, billing, or everyday electricity calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.