What do I put in V55/5 box 48 power-to-weight ratio?
Reviewed 2026-07-10
Short answer
Use the value from the Certificate of Conformity if shown. V355/5 says if you do not have this information, you can leave this section blank.
Official position
The V355/5 guidance lists box 48 as power/weight ratio in kW/kg and says to take this information from the Certificate of Conformity if shown. If you do not have this information, it says you can leave this section blank.
What to do
Check the CoC or approval evidence for a kW/kg power-to-weight value.
Use the value exactly as shown if it exists.
Do not calculate it from internet horsepower and guessed weight unless DVLA or the guidance for your route requires it.
If missing, leave it blank under the V355/5 guidance rather than inventing a value.
Common mistakes
- Using bhp/ton instead of kW/kg.
- Calculating from an online spec sheet for a different trim.
- Filling every technical box even when V355/5 says missing information can be left blank.
Related help
Official sources
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