How to Measure Your Caravan (A-Measurement Guide 2026 UK)
- IDS Camping & Leisure
- Mar 1
- 3 min read
If you’re buying a full caravan awning, getting the correct A-measurement is absolutely essential.
Order the wrong size and you risk:
Sagging fabric
Poor tension
Water pooling
Increased condensation
Storm vulnerability
In this 2026 UK guide from IDS Camping & Leisure, we explain exactly how to measure your caravan properly.
What Is an A-Measurement?
The A-measurement is the distance measured:
From the ground → up the awning rail → all the way around → back down to the ground on the other side.
It follows the full curve of the caravan’s awning rail.
This measurement determines the correct size for a full awning.
Quick Answer: How Do I Measure My Caravan for an Awning?
To measure your caravan:
Park your caravan on level ground
Place a tape measure at the ground directly below the awning rail
Run the tape through the full awning rail channel
Continue until you reach the ground on the opposite side
Record the full measurement in centimetres
This is your A-measurement.
Step-by-Step: How to Measure Correctly
Step 1 – Level Your Caravan
Always measure when the caravan is level.
If it’s nose-high or leaning, the measurement will be inaccurate.
Step 2 – Use a Soft Tape Measure
A flexible tape measure works best because:
It follows the rail curve
It sits properly inside the channel
It avoids sharp bends
Avoid using a rigid builder’s tape if possible.
Step 3 – Start at Ground Level
Place the tape on the ground directly below where the awning rail begins.
Do not start from the chassis — measure from the ground.
Step 4 – Follow the Full Rail Channel
Thread the tape inside the awning rail track.
Follow it all the way around the curve.
Make sure:
The tape sits flat
It doesn’t twist
It stays tight but not stretched
Step 5 – Finish at Ground Level
Bring the tape back down to the ground on the opposite side.
Record the full centimetre measurement.
Most UK caravan awnings are sized in 25cm increments.
Can I Use My Caravan Handbook Instead?
Sometimes — yes.
Manufacturers often list:
A-measurement range
Compatible awning sizes
However:
Older caravans may differ
Rail modifications change sizing
Manufacturing tolerances vary
Measuring yourself is always safest.
Do I Need an A-Measurement for an Air Awning?
Not always.
Air awnings (porch style) are usually sized by width, not full A-measurement.
But full air awnings still require A-measurement sizing.
If unsure, check your specific model from brands like:
What Happens If My Awning Is Too Big?
If oversized:
Fabric won’t tension correctly
Roof may sag
Water can pool
Condensation may worsen
Storm resistance reduces
Read our How to Guide
What If My Awning Is Too Small?
If undersized:
It won’t reach the ground
Pegging becomes unstable
Side panels won’t seal
Frame stress increases
Correct sizing prevents long-term damage.
A-Measurement vs Porch Awnings
Feature | Full Awning | Porch Awning |
Requires A-Measurement | Yes | No (usually width-based) |
Covers Full Caravan Side | Yes | Partial |
Best for Seasonal Pitch | Yes | Sometimes |
Easier Setup | Moderate | Easier |
For full guidance, visit our Caravan Awning Hub (2026).
Common Measuring Mistakes
❌ Measuring while caravan is unlevel
❌ Guessing based on previous awning
❌ Starting above ground level
❌ Using inches instead of centimetres
❌ Not following the full rail curve
Pro Tip from IDS Camping & Leisure
If your measurement sits between two sizes:
Choose the size recommended by the awning manufacturer — never size up without checking compatibility.
Correct fit reduces:
Condensation
Wind movement
Fabric strain
Premature wear
FAQs – Measuring Your Caravan
What is the average A-measurement of a UK caravan?
Most UK caravans range between 825cm and 1100cm, depending on model and length.
Can I measure on a slope?
No. Always measure on level ground to ensure accuracy.
Do I measure inside or outside the awning rail?
Measure inside the awning rail channel following its curve.
Does tyre size affect A-measurement?
No — A-measurement follows the rail curve, not the wheel arch.
Do I need to measure every time I change awning brand?
If your caravan hasn’t changed, the measurement stays the same — but always check brand sizing charts.
Final Thoughts
Measuring your caravan correctly is the foundation of buying the right awning.
Take 10 minutes to measure properly — it can save hundreds of pounds and prevent long-term issues.
For awning advice, accessories and seasonal pitch upgrades, explore the range at IDS Camping & Leisure.
Comments