Convert Petawatts to Watts

Convert petawatts (PW) to watts (W) in seconds with this simple calculator. Enter a value in petawatts to get the exact watt result for power and energy-rate math.

Petawatts

Watts to Petawatts

How many petawatts in a watts?

In 1 petawatts there are 1,000,000,000,000,000 watts. Meanwhile in 1 watts there are 1.00000e-15 petawatts. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Watts to Petawatts calculator above to convert any number.

* Values rounded to 6 decimal places for readability

How to convert petawatts to watts?

To convert petawatts (PW) to watts (W), use the SI prefix rule: peta- means 10¹⁵. That means 1 petawatt equals 1,000,000,000,000,000 watts.

Conversion formula:

W = PW × 10¹⁵

Quick examples:

1 PW = 1 × 10¹⁵ W = 1,000,000,000,000,000 W
0.5 PW = 0.5 × 10¹⁵ W = 500,000,000,000,000 W
3.2 PW = 3.2 × 10¹⁵ W = 3,200,000,000,000,000 W

When converting large power values like petawatts to watts, rounding can change the last digits, so keep enough decimal places if you need exact results.

Frequently asked questions

How many watts are in a petawatt (PW)?

One petawatt equals 1,000,000,000,000,000 watts.
That’s 10^15 watts.

What is the formula to convert petawatts to watts?

Use this simple formula:

watts (W) = petawatts (PW) × 10^15

So, 2 PW = 2 × 10^15 W.

How do you convert petawatts to watts by hand?

Multiply the petawatt value by 1,000,000,000,000,000.
You can also move the decimal point 15 places to the right.

Example:
0.5 PW = 0.5 × 1,000,000,000,000,000 = 500,000,000,000,000 W

Why is a petawatt so large?

A petawatt is used for extreme power levels. You’ll see it in laser physics, short pulse systems, and large-scale energy talk. Most daily devices use watts, kilowatts, or megawatts instead.

What does “peta-” mean in petawatt?

“Peta-” is an SI prefix that means 10^15 (one quadrillion).
So a petawatt is a quadrillion watts.

Is a petawatt the same as a petajoule per second?

Yes. A watt is a joule per second, so:

1 PW = 10^15 W = 10^15 joules per second

This matters in physics and energy rate problems.

Can petawatts be used for electricity grids?

Power grids are usually measured in gigawatts (GW) or terawatts (TW), not petawatts. Petawatt levels are far beyond normal grid output and are more common in short, intense lab bursts.

What are common examples of petawatt values?

Petawatt figures often show up in high-power laser systems. These systems can reach petawatt peaks for a tiny fraction of a second. That peak power is not the same as long-term power use.

How do I convert watts back to petawatts?

Divide watts by 10^15:

petawatts (PW) = watts (W) ÷ 10^15

Example:
3,000,000,000,000,000 W ÷ 10^15 = 3 PW

What’s the difference between peak power in petawatts and energy used?

Power is the rate of energy use. Energy adds up over time.

Power (W or PW) tells you how fast energy flows.
Energy (J, kWh) tells you how much total energy was used.

A laser can have petawatt peak power but still use a modest total energy if the pulse is very short.

Do I need scientific notation for petawatts to watts conversion?

You don’t have to, but it helps keep numbers readable.
Many watt results from petawatts have 16 digits or more.

Example:
1.2 PW = 1.2 × 10^15 W = 1,200,000,000,000,000 W

Are petawatts and watts part of the SI system?

Yes. The watt is an SI unit. The prefix “peta-” is also SI, so petawatt (PW) is a valid SI-based unit.

How does this converter work?

The Calculate Box tool to convert petawatts to watts uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a petawatts value in the box and have it instantly converted to watts.