Terawatt is 1000000000000 watt units.
Terawatts to Petawatts Converter — TW to PW
Convert Terawatt (TW) to Petawatt (PW) using the exact conversion factor (1 terawatt = 0.001 petawatt). See the formula, worked examples, and conversion table.
Terawatts to Petawatts converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Petawatt is 1000000000000000 watt units.
Result = input x 1e+12 / 1e+15.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Terawatts to Petawatts
Terawatt and Petawatt both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Terawatt is 1000000000000 watt units, and petawatt is 1000000000000000 watt units.
Formula
petawatts = terawatts × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 terawatt equals 1e+12 base units, and 1 petawatt equals 1e+15 base units, so dividing one by the other gives the direct terawatt-to-petawatt factor of 0.001.
Simple example
1 TW × 0.001 = 0.001 PW
1 terawatt = 0.001 petawatts.
Real-world example
100 TW × 0.001 = 0.1 PW
100 terawatts = 0.1 petawatts.
Conversion table
| Terawatt (TW) | Petawatt (PW) |
|---|---|
| 1 TW | 0.001 PW |
| 10 TW | 0.01 PW |
| 50 TW | 0.05 PW |
| 100 TW | 0.1 PW |
| 500 TW | 0.5 PW |
| 1,000 TW | 1 PW |
Reverse conversion: Petawatt to Terawatt
0.001 PW × 1000 = 1 TW
0.001 petawatts = 1 terawatt.
terawatts = petawatts × 1000
For a page dedicated to this direction, see Petawatt to Terawatt.
Understanding the Terawatt (TW)
Terawatt is 1000000000000 watt units.
Understanding the Petawatt (PW)
Petawatt is 1000000000000000 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many petawatts are in 1 terawatt?
1 terawatt equals 0.001 petawatts, using the exact defined conversion factor rather than an estimate.
How do I convert terawatt to petawatt?
Multiply the terawatt value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert petawatt back to terawatt?
Use the reverse factor: 1 petawatt equals 1,000 terawatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a terawatt?
Terawatt (TW) is a unit of engineering.
What is a petawatt?
Petawatt (PW) is a unit of engineering.
Is the terawatt to petawatt conversion exact?
Yes. Both terawatt and petawatt are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.