Getting the correct size is one of the most important steps in installing a caravan awning. A well-fitted awning sits flush against the van body, delivers full UV coverage, and performs well in Australian wind conditions without excessive bracket strain. Xtend Outdoors has been fitting awnings to Australian caravans for over 20 years, and every job begins with accurate measurement.
This caravan awning size guide walks you through the A-measurement method, step-by-step instructions for rollout and cassette awnings, how to convert your measurement to a standard size, and what goes wrong when sizing is off.
Why Your Caravan Length and Your Awning Size Are Not the Same
Many first-time buyers treat their van's overall length as the awning size, but every caravan awning size guide will tell you the same thing: caravan awning dimensions are set by the length of your awning rail (the A-measurement), not the bumper-to-bumper vehicle length.
The figure on your compliance plate includes the drawbar, tow hitch, and any overhangs. Your awning size is determined by the length of your awning rail only. Browse the full range of caravan awnings once you know your size.
What Is the A-Measurement?
The A-measurement is the reference point in every caravan awning size guide across Australia. It is a ground-to-ground measurement: the distance from the ground, up and along your caravan's awning rail, and back down to the ground at the other end. This single figure answers "what size awning do I need for my caravan," and it is the measurement Xtend Outdoors uses when manufacturing every awning to fit your van.
How Do You Measure a Caravan for an Awning?
Knowing how to measure a caravan awning accurately is what makes this caravan awning size guide practical. The method differs slightly between rollout and cassette awnings. For a rollout awning you do not need specialist tools: grab a tent peg, a ball of string, and a tape measure, and have a second person help where possible.
This guide applies to vans with a standard awning rail running along the body.
Caravan Awning Measurement Steps: Rollout Awnings
Follow these steps for a rollout awning:
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Knock a tent peg into the ground at the rear end of the awning rail
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Tie one end of the string to the peg, then run it up and along the awning rail to the front of the van
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Bring the string back down to the ground at the front, keeping it flush against the rail
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Cut the string at ground level, then measure its length with your tape measure
Measure twice before recording your figure. Even a 50 mm error in how to measure a caravan awning can shift you between standard sizes, so take your time on this step.
Measuring a Cassette or Box Awning
For cassette awnings, caravan awning dimensions are taken from end cap to end cap of the cassette housing. Cassette sizing conventions vary between manufacturers, so confirm the correct measurement method with your supplier before placing an order.
How to Convert Your Measurement to the Right Awning Size
Once you have your A-measurement in millimetres, converting it is straightforward. Every awning sizing guide Australia caravanners reference follows the same convention: sizes are in feet, from 8ft through to 22ft.
How to Find the Correct Awning Size When Measurements Fall Between Sizes
Always choose the smaller standard size. An A-measurement of 3,800 mm rounds down to a 12ft awning (approximately 3,658 mm), not a 14ft. Oversized awnings are harder to seal at the ends and create more wind resistance. If you are still unsure, our team can advise based on your measurement.
What Happens If You Measure Your Awning Incorrectly?
Incorrect sizing leads to real problems that are both frustrating and costly. An awning that is too large will not seat correctly in the brackets, leaving gaps that allow water ingress and increasing flapping in Australian conditions. You also lose UV coverage at the ends of the van, a significant issue on outback runs or coastal trips in summer.
This caravan awning size guide exists to help you avoid those outcomes. Incorrect awning sizing for caravans means return costs, remanufacturing delays, and fitting a product that was never matched to your van's specific measurements.
The DIY Measure Kit from Xtend Outdoors is designed for owners who want to take accurate measurements at home with confidence. It includes a step-by-step template and direct access to the Xtend team if questions come up.
DIY Measure Kit: Home Measurement Made Simple
The DIY Measure Kit removes guesswork from the process. It produces a verified measurement you can submit with your order, ensuring the awning is manufactured to the exact caravan awning dimensions your van requires. Custom measurement is always necessary; there is no universal size that fits all vans.
Get the Right Fit with Xtend Outdoors
With over 20 years fitting awnings to Australian caravans, Xtend Outdoors has worked through every sizing scenario across a wide range of van configurations. This caravan awning size guide covers the key steps, but the Xtend team is always available if you need a second opinion on your measurements.
Australia-Wide Mobile Fitment Service
If you would prefer to leave measuring to the experts, our Australia-wide mobile installation service comes to your caravan park, home, or storage facility. Our team handles both measurement and installation in a single visit; there is no need to move the van.
Call us on 1300 783 776 or visit our fitment pricing page for service costs. Whether you are heading to one of our caravan shows across Australia or browsing online, our team is ready to help you get the sizing right.
