In 1 terawatts there are 1,341,022,088.843808 horsepower. Meanwhile in 1 horsepower there are 7.45700e-10 terawatts. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Horsepower to Terawatts calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert terawatts (TW) to horsepower (hp), convert terawatts to watts (W) first, then watts to horsepower.
Conversion formula (TW to hp):
Quick reference:
Tip: If you need more precision, keep 746 W per hp in the calculation and round at the end.
Use this simple formula:
hp = TW × 1,341,022,089.6PS = TW × 1,359,621,617.3These numbers come from the base units. One terawatt equals 1,000,000,000,000 watts.
That’s about 1.34 billion hp in mechanical horsepower.
Mechanical horsepower (hp) is common in the United States and equals about 745.7 watts.
Metric horsepower (PS) is used in many other places and equals about 735.5 watts.
Because PS is a bit smaller, the same terawatt value converts to a slightly higher PS number.
A terawatt is huge. It’s one trillion watts.
Horsepower is much smaller by design. One horsepower is under 1,000 watts.
So even a fraction of a terawatt turns into millions of horsepower.
Convert step by step:
W = TW × 1,000,000,000,000hp = W ÷ 745.6998716PS = W ÷ 735.49875This gives the same results as the direct formulas.
Yes, if you’re comparing power output. Terawatts are used for very large power levels, like grid-scale output, while engines are usually rated in horsepower, kilowatts, or megawatts.
For most engines, terawatts will be far above realistic values.
Horsepower is a unit of power, not energy. Power measures the rate of doing work.
Energy measures total work over time.
For energy, you would use units like watt-hours (Wh), kilowatt-hours (kWh), or joules (J).
A terawatt (TW) is a unit of power equal to 1 trillion watts.
It’s often used to describe very large power levels, like the output of many power plants combined.
For mechanical horsepower:
A single horsepower is a tiny fraction of a terawatt.
Here are quick reference examples (mechanical hp):
These help when you need a fast estimate.
Rounding can matter if you need high accuracy. Large numbers can hide small rounding errors, but those errors can still mean thousands of horsepower.
If precision matters, keep more decimal places during the math and round at the end.
The Calculate Box tool to convert terawatts to horsepower uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a terawatts value in the box and have it instantly converted to horsepower.