Gigawatts to Horsepower
An instant gigawatts-to-horsepower converter, with the formula and a reference table below.
| Gigawatts | Horsepower |
|---|---|
| 1 GW | 1341022.089595 hp |
| 2 GW | 2682044.17919 hp |
| 3 GW | 4023066.268785 hp |
| 5 GW | 6705110.447975 hp |
| 10 GW | 13410220.89595 hp |
| 25 GW | 33525552.239876 hp |
| 50 GW | 67051104.479751 hp |
| 100 GW | 134102208.959503 hp |
How to use
- Enter a value in the Gigawatts field.
- The Horsepower figure appears immediately — no button to press.
- Typing in the Horsepower field converts back to Gigawatts the same way.
- Use the reference table for the values that come up most often.
Gigawatts to Horsepower formula
Converting gigawatts to horsepower is a single multiplication by 1341022.09.
hp = GW × 1341022.09
Why this factor: the gigawatt and the horsepower are both defined against the watt, so dividing one definition by the other gives 1341022.09 directly. Both definitions are set out in full below.
To go the other way, divide by 1341022.09 — or use the Horsepower to Gigawatts converter, which is the same calculation reversed.
Worked example
Take 75 GW and multiply by the factor 1341022.09: the result is 100576656.719627 hp.
75 GW × 1341022.09 = 100576656.719627 hp
The converter above does this for any value you type, in either direction.
What is a gigawatt?
A gigawatt is one billion watts — the scale of national grids and large nuclear plants.
Definition: Exactly 1×10⁹ watts.
Where it is used: National electricity demand, total installed renewable capacity, and large nuclear reactor output.
What is a horsepower?
Mechanical horsepower is the traditional English-speaking unit of engine power.
Definition: Defined as 550 foot-pounds per second, which is about 745.700 watts.
Where it is used: US and UK car, motorcycle and small-engine power ratings.
Worth knowing: Distinct from metric horsepower (PS), which is about 1.4% smaller — so the same engine scores slightly higher in PS than in hp.
Gigawatts vs Horsepower
The gigawatt is a metric unit while the horsepower is an imperial unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many horsepower are in a gigawatt?
One gigawatt equals 1341022.09 horsepower.
What is the formula to convert gigawatts to horsepower?
Multiply the number of gigawatts by 1341022.09. To reverse it, divide by 1341022.09 instead.
How do I convert horsepower back to gigawatts?
Divide by 1341022.09, which is the same as multiplying by 7.45699872e-07.
How many horsepower are in 10 gigawatts?
10 GW works out to 13410220.89595 hp.
Is there anything to watch out for with horsepower?
Distinct from metric horsepower (PS), which is about 1.4% smaller — so the same engine scores slightly higher in PS than in hp.
How is the gigawatt defined?
Exactly 1×10⁹ watts.