BHP Check by Registration — Find Your Car's Power Output
Knowing a car's brake horsepower matters for insurance, performance expectations, and verifying you are buying the right variant. Here is how to check BHP by registration number and what the figure means.
How to Find BHP from a Registration
The DVLA records engine capacity (in cc) and the power output in kilowatts (kW) for every registered vehicle. A full vehicle specification check via VEHIXA returns both figures, along with torque output where available. To convert kW to the more familiar BHP figure: multiply kW by 1.341. For example, a car recorded as 110kW produces approximately 147 BHP.
Why BHP Matters for Buyers
Many popular models are sold in multiple engine variants with significantly different power outputs. A Ford Focus, for example, ranges from around 85 BHP (1.0 EcoBoost entry) to over 280 BHP (ST Performance). The price difference between variants can be substantial. Always verify that the BHP stated by the seller matches what the registration returns — sellers occasionally misrepresent which variant they are selling.
BHP and Insurance Groups
Insurance groups (1–50) are assigned by Thatcham Research and take power output into account alongside repair costs, safety features, and security rating. Higher-powered cars generally sit in higher insurance groups. When comparing cars to buy, check the insurance group alongside the BHP — it will directly affect your running costs, particularly if you are a younger driver or have a restricted history.
Modifications and BHP
DVLA records show the manufacturer's stated power at time of registration. Engine remaps, air filter upgrades, and exhaust modifications that increase BHP above the standard figure are not reflected in DVLA data. If you are buying a modified car, ask the seller for documentary evidence of any tune or remap and check whether they have declared the modification to their insurer. Undeclared modifications that increase performance can invalidate an insurance policy.
BHP vs PS vs kW — The Units Explained
European manufacturers often quote power in PS (Pferdestärke, German for horsepower) or kW. PS and BHP are nearly identical (1 PS ≈ 0.986 BHP), so the difference is negligible for most purposes. kW is the official SI unit — DVLA records use kW. Quick conversions:
- 100 kW = 134 BHP = 136 PS
- 150 kW = 201 BHP = 204 PS
- 200 kW = 268 BHP = 272 PS
Frequently Asked Questions
Can I check a car's BHP by registration number?
Yes. A DVLA-linked registration check returns the engine size in cc, and a full vehicle specification check returns the manufacturer's stated power output in kW (kilowatts). Converting kW to BHP: multiply by 1.341. Full spec data from VEHIXA includes manufacturer BHP figures where available.
Why is BHP important when buying a used car?
BHP affects insurance group, road tax band (indirectly via CO2), running costs, and whether the car meets your performance expectations. Different engine options in the same model can have significantly different BHP outputs. Always verify the BHP matches the variant being sold.
What is the difference between BHP and kW?
BHP (brake horsepower) is the traditional UK and US power unit. kW (kilowatts) is the metric equivalent. To convert: multiply kW by 1.341 to get BHP, or divide BHP by 1.341 to get kW. Most UK manufacturers publish both, and DVLA records typically use kW.
Does modifying an engine change the BHP on DVLA records?
No. DVLA records show the manufacturer's stated output at the time of registration. Modifications — including remapping, tuning, or engine swaps — are not automatically reflected in DVLA data. If a seller claims a car has been remapped, this will not appear on a standard check.
How does BHP affect my car insurance?
BHP is one factor that determines a car's insurance group (1–50). Higher-powered cars tend to sit in higher insurance groups and attract higher premiums. Modifications that increase BHP beyond the manufacturer's standard must be declared to your insurer or the policy may be voided.
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