Zeptowatts to Watts
Convert Zeptowatts to Watts instantly. Free online power unit converter with exact formula, conversion table and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Converter
Length Converter
Convert metric, imperial, and nautical distance units.
Context values
Some unit families need one extra value for a physically accurate result.
Use the converter to see the formula.
Results update instantly for Zeptowatts to Watts conversions.
Reserved above the conversion cards and below the converter.
Formula
W = zW × 1e-21
zW = W × 1e+21
Conversion table
| 1 zW | 1e-21 W |
| 5 zW | 5e-21 W |
| 10 zW | 1e-20 W |
| 20 zW | 2e-20 W |
| 50 zW | 5e-20 W |
| 100 zW | 1e-19 W |
| 500 zW | 5e-19 W |
| 1000 zW | 1e-18 W |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
What is the source unit in this conversion?
The source unit is the zeptowatt (zW). A zeptowatt is 1e-21 watt units.
What is the destination unit in this conversion?
The destination unit is the watt (W). The watt is the SI unit of power, equal to one joule per second.
How do I convert zeptowatts to watts?
Multiply the zeptowatt value by 1e-21 to get watt. For example, 1000 zW × 1e-21 = 1e-18 W.
Is the zeptowatts to watts conversion exact?
Yes. Both units are defined by fixed numeric relationships to the watt, so the conversion factor used here, 1e-21, is exact.
Where is this conversion commonly used?
It is used when comparing power ratings expressed in zeptowatts against equipment, engines, or specifications rated in watts.
Can I convert watts back to zeptowatts?
Yes. Multiply the watt value by 1e+21 to get zeptowatt.
Reserved between the FAQ and the article so the page stays balanced.
About this conversion
This page converts zeptowatts (zW) into watts (W), two units used to describe power, the rate at which energy is transferred or work is done.
A zeptowatt is 1e-21 watt units.
The watt is the SI unit of power, equal to one joule per second.
The formula is W = zW × 1e-21, derived from each unit's fixed relationship to the watt, the SI unit of power.
Because both units are defined by exact numeric relationships to the watt, this conversion is exact rather than approximate.