The watt (W) is the SI unit of power, equal to one joule of energy transferred per second.
Watts to Zettawatts
Convert Watt (W) to Zettawatt (ZW) instantly with an exact formula, conversion table, and FAQ.
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Convert watts (W) to zettawatts (ZW) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A Zettawatt (ZW) equals 1e+21 watt(s), a scaled unit of electrical power used for zetta-scale electrical work.
ZW = W × 1.000000e-21
Results update instantly for Watts to Zettawatts conversions.
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Formula
ZW = W × 1.000000e-21
W = ZW × 1.000000e+21
Conversion table
| 1 W | 1.000000e-21 ZW |
| 5 W | 5.000000e-21 ZW |
| 10 W | 1.000000e-20 ZW |
| 20 W | 2.000000e-20 ZW |
| 50 W | 5.000000e-20 ZW |
| 100 W | 1.000000e-19 ZW |
| 500 W | 5.000000e-19 ZW |
| 1000 W | 1.000000e-18 ZW |
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How the formula works
Both watt and zettawatt measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watts by 1.000000e-21 to get zettawatts. To reverse the conversion, multiply a zettawatt value by 1.000000e+21 to get back to watts.
Frequently asked questions
What is Watt (W)?
The watt (W) is the SI unit of power, equal to one joule of energy transferred per second.
What is Zettawatt (ZW)?
A Zettawatt (ZW) equals 1e+21 watt(s), a scaled unit of electrical power used for zetta-scale electrical work.
How do I convert watts to zettawatts?
Multiply the watt value by 1.000000e-21 to get the equivalent in zettawatts. For example, 5 W × 1.000000e-21 = 5.000000e-21 ZW.
Is this conversion exact?
Yes. Both units use fixed, defined scale factors, so the factor 1.000000e-21 is an exact, non-rounded value.
Can I convert zettawatts back to watts?
Yes. Divide the zettawatt value by 1.000000e-21, or multiply it by 1.000000e+21, to get watts.
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About converting watts to zettawatts
The watt (W) is the SI unit of power, equal to one joule of energy transferred per second. A Zettawatt (ZW) equals 1e+21 watt(s), a scaled unit of electrical power used for zetta-scale electrical work.
Use this calculator to move between watts and zettawatts accurately for homework, engineering, billing, or everyday electricity calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.