A navy wants to convert its 20,000 diesel ship engines each rated 5,000 hp to electric. What GW of generation is needed?

20,000 × 5,000 hp = 100,000,000 hp × 0.000000000745700 GW/hp = 74.6 GW — roughly the electricity output of 75 large nuclear power plants.

If we replaced every car in the US (averaging 200 hp each, 280 million cars) with EVs, how many GW of driving power would that be?

280,000,000 × 200 hp = 56,000,000,000 hp × 0.000000000745700 = 41,759 GW. Most of that capacity is never used simultaneously — average cruising power is 20–30 hp per car.

How many horsepower is the entire US electrical grid at 1,000 GW peak?

1,000 GW × 1,341,022 = 1.341 trillion hp — an almost incomprehensible number that illustrates why energy policy is discussed in GW, not hp.

Is the GW to hp conversion precise?

1 GW = 1,341,022 hp (rounded to 7 significant figures). The full precision is 1 GW = 10⁹ W ÷ 745.69987 W/hp = 1,341,022.1 hp.

Gigawatts to Horsepower Converter

Enter a value to instantly convert between power units.

From

Precision4 dp

1 Gigawatt = 1341022.0896 Horsepower (mech)

Key Formulas

Kilowatt → Horsepower (mech)

hp = kW × 1.34102

Horsepower (mech) → Kilowatt

kW = hp × 0.7457

Watt → Kilowatt

kW = W × 0.001

Kilowatt → Watt

W = kW × 1000

Formula

hp = GW × 1,341,022

When studying fleet electrification — shipping, rail, aviation — you might compare the total horsepower of an existing fleet to the gigawatts of electricity needed to replace it. A country's 10 GW of road vehicle power needs = 13.4 million hp, which helps frame the scale of charging infrastructure needed. This conversion also appears in historical comparisons and energy transition studies.

Source: NIST SP 811, Table B.8

Last reviewed: 2026-06-11 · see our methodology

Frequently Asked Questions

Real-World Examples

1 GW of electrical generation capacity = 1,341,022 hp — more than a million horsepower, illustrating grid scale vs. vehicle scale.

1 GW = 1341022 hp

0.001 GW (1 MW) = 1,341 hp — the power of a large diesel locomotive, showing how a single GW holds thousands of locomotive equivalents.

0.001 GW = 1341 hp

5 GW of national hydroelectric capacity = 6.7 million hp — equivalent to 6.7 million 1-hp motors running simultaneously.

5 GW = 6705110 hp

0.1 GW (100 MW) = 134,102 hp — the combined output of about 134 large car engines, or a significant marine propulsion fleet.

0.1 GW = 134102 hp

kw to hp hp to kw watts to kw kw to watts mw to kw kw to mw

Gigawatts to Horsepower Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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