How do you convert terawatts to horsepower?

To convert terawatts (TW) to horsepower (hp), multiply the power in terawatts by 1.341022e+9 (horsepower = terawatts × 1.341022e+9).

What is 5 terawatts in horsepower?

5 terawatts (5 TW) is equal to 6.705110e+9 horsepower (6.705110e+9 hp).

Which is larger, 1 terawatt (TW) or 1 horsepower (mechanical) (hp)?

One terawatt (TW) is larger than one horsepower (mechanical) (hp). Specifically, 1 TW contains 1.341022e+9 hp, whereas 1 hp is 7.456999e-10 TW.

How do I convert back from horsepower (hp) (hp) to terawatts (TW)?

To reverse the calculation from hp to TW, multiply your horsepower (mechanical) value by the inverse factor 7.456999e-10 (or divide by 1.341022e+9). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round TW to hp results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 TW ≈ 6,705,110,447.98 hp). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Terawatts to Horsepower Converter

Enter the power in terawatts below to convert it to horsepower.

Horsepower (hp) to Terawatts (hp → TW)

Convert Terawatts to Horsepower (hp)

Enter a value in terawatts (TW) to convert to horsepower (hp) (hp).

Value (TW)

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Result

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6.70511e+9horsepower (hp)

5 TW = 6.70511e+9 hp

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Suggested Conversions

Reference:NIST SP 811 (NIST SP 811 App. B.9 (Power & Radiant Flux))

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Terawatt to Horsepower Conversion Table

Table showing various terawatt measurements converted to horsepower. Click any preset value or arrow to load it into the converter.

Terawatts (TW)	Horsepower (hp) (hp)
0.0000001 TW	134.102209 hp
0.0000002 TW	268.2044179 hp
0.0000003 TW	402.3066269 hp
0.0000004 TW	536.4088358 hp
0.0000005 TW	670.5110448 hp
0.0000006 TW	804.6132538 hp
0.0000007 TW	938.7154627 hp
0.0000008 TW	1,072.8176717 hp
0.0000009 TW	1,206.9198806 hp
0.00000001 TW	13.4102209 hp

How to Convert Terawatts to Horsepower

To convert terawatts to horsepower, multiply the power by the following conversion ratio: 1,341,022,089.5950284 horsepower/terawatt.

Since one terawatt is equal to 1,341,022,089.5950284 horsepower, you can use this simple formula to convert:

horsepower = terawatts × 1,341,022,089.5950284

The power in horsepower is equal to the power in terawatts multiplied by 1,341,022,089.5950284.

For example, here's how to convert 5 terawatts to horsepower using the formula above.

horsepower = (5 TW × 1,341,022,089.5950284) = 6,705,110,447.975142 hp

How Many Horsepower Are in a Terawatt?

There are 1,341,022,089.5950284 horsepower in a terawatt, which is why we use this value in the formula above.

1 TW = 1,341,022,089.5950284 hp|1 hp = 7.456999e-10 TW

Our terawatt to horsepower calculator automatically converts your power measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Terawatts and horsepower are both units used to measure power. Keep reading to learn more about each unit.

What Is a Terawatt?

A terawatt is a unit of power equal to 1e+12 watts (W), the base unit for power. Equal to 10¹² Watts (1,000 GW). [1]

The terawatt is classified as an International System of Units (SI) unit of power. Terawatts can be abbreviated as TW; for example, 1 terawatt can be written as 1 TW.

In the metric system, "tera" is the standard SI prefix for trillions, or 10¹². This makes the terawatt (TW) a convenient decimal multiple of the watt (W).

In practice, terawatts (TW) are widely used across large-scale industrial, bulk, and macro-level power specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.

Learn more about terawatts in our Power Converter.

What Is a Horsepower?

A horsepower is a unit of power equal to 745.6998716 watts (W), the base unit for power. Imperial mechanical horsepower (550 ft·lbf/s ≈ 745.7 W). [2]

The horsepower is classified as a US customary and imperial unit of power. Horsepower can be abbreviated as hp; for example, 1 horsepower can be written as 1 hp.

When working with horsepower (hp) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, horsepower (hp) are widely used across standard power applications within US customary and imperial workflows, engineering documentation, and technical data sheets.

Learn more about horsepower in our Power Converter.

When converting power between terawatts (TW) and horsepower (hp), keep full floating-point precision (1 TW = 1,341,022,089.5950284 hp; 1 hp = 7.456999e-10 TW) during intermediate calculations and round only the final horsepower figure to match your instrument tolerance.

More Terawatt & Horsepower Conversions

Need to calculate in the opposite direction? Use our horsepower (hp) to terawatts calculator to switch your starting unit immediately. You can also explore related tools such as converting horsepower (hp) to terawatts, converting watts to horsepower (hp), or converting kilowatts to horsepower (hp).

Convert from Terawatts

Convert to Horsepower

Frequently Asked Questions

There are 1.341022e+9 horsepower (hp) in 1 terawatt (TW). Conversely, 1 horsepower (hp) is equal to 7.456999e-10 terawatts (TW).

Power Converter

Quick Info

Direct Factor: 1 terawatt (TW) equals 1.341022e+9 horsepower (hp) (hp).
Inverse Factor: 1 horsepower (mechanical) (hp) equals 7.456999e-10 terawatts (TW).
Formula: horsepower (hp) = terawatts × 1.341022e+9.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Terawatt (TW)

Equal to 10¹² Watts (1,000 GW).

Horsepower (Mechanical) (hp)

Imperial mechanical horsepower (550 ft·lbf/s ≈ 745.7 W).

Watt (W)

Coherent SI unit of power equal to 1 Joule per second (1 J/s).

References

[1]NIST SP 811 · NIST SP 811 App. B.9 (Power & Radiant Flux)
Source
[2]NIST CUU · Derived SI Unit: Watt (W)
Source
[3]BIPM · SI Brochure (9th Ed.) — Power
Source

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References

NIST · BIPM · ISO

[1]
NIST SP 811 (NIST SP 811 App. B.9 (Power & Radiant Flux))·Power Metrology Standard — Terawatts (TW) to Horsepower (hp) (hp)
NIST SP 811 Standard
[2]
NIST CUU (Derived SI Unit: Watt (W))·Unit Specifications: Terawatt (TW) & Horsepower (Mechanical) (hp)
NIST CUU Specification
[3]
BIPM (SI Brochure (9th Ed.) — Power)·Conversion Factors & Mathematical Basis (TW to hp)
BIPM Reference

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