Ever seen that little number in litres written on a surfboard? 34L? 58L? 70L?
Perhaps you’ve heard someone in the lineup mention it and you nodded along like you knew what they meant.
No judgement. Most of you are new here.
But surfboard volume is one of those things that makes a lot of previously confusing stuff about surfboards and your surfing click into place.
Why that board felt like a dream and this one feels like a plank.
Why you’re paddling twice as hard as the person next to you for half the waves.
Why moving down in board size too soon is one of the most common ways surfers accidentally stall their own progression.
Understanding surfboard volume is one of the most important parts of choosing the right surfboard for your level, weight and wave conditions.
So let’s break it down.
No jargon. No surf IQ degree required. Just plain, down-to-earth advice from people who’ve been there, done that.
So what actually is surfboard volume?
Volume is a measurement of how much space a surfboard takes up. It’s calculated using the board’s length, width and thickness. It’s then expressed in litres.
One litre of foam displaces one litre of water. Which means volume is essentially a measure of buoyancy or float. The more litres, the more the board wants to sit on top of the water. The fewer litres, the more it sinks under your weight.
And that’s pretty much the whole concept.
Everything else like paddle power, wave catching ability, stability and manoeuvrability all flow from that one simple idea.
Why does float matter so much?
Because float is directly related to how easy it is for you to paddle out to the lineup, catch waves and pop-up… especially if you’re a beginner or even an intermediate surfer.
Think about it like this. Before you can do anything on a wave, you have to catch it. And to catch it, you have to match its speed.
A board with more volume sits higher in the water, which means less drag, which means you paddle faster, which means you catch more waves (which will in turn make you a better surfer, faster).
For anyone still building their surfing (beginner surfers especially), that extra time and stability is everything.
You can’t develop technique on a board that’s constantly wobbling or twitching under you.
How do you calculate the right surfboard volume for you?
Before we roll into this section, it’s important to note that as a beginner, you probably don’t need to know this. Listen to your guide or your instructor. They’ll sort you out lickity split.
If you’re the type of person who loves nerding out on surf stuff, this is right up your alley.
When it comes to calculating surfboard volume, there’s no single magic number. There is however a useful formula to start with: the Guild Factor (GF).
This system was developed by shaper Whitney Guild. It helps you determine ideal surfboard volume based on your body weight and skill level.
You take your weight in kilograms and multiply it by a factor that corresponds to your experience level:
- Beginner surfers: GF of 0.50–0.60. If you weigh 70kg, you’re looking at roughly 35 to 42 litres… though many true beginners ride higher volume foamies well above this range. That’s completely fine
- Intermediate surfers: GF of 0.38–0.45. That same 70kg surfer would be looking at around 27 to 32 litres
- Advanced/experienced surfers: GF of 0.30–0.38… sometimes lower depending on wave conditions and board shape
There are also free surfboard volume calculators online where you can enter your weight and skill level to get a recommended range. They’re worth using, though the most accurate results still come from combining those numbers with local knowledge about the waves you actually surf.
Can you actually calculate a board’s volume yourself?
Yes, though it requires a bit of maths. The basic formula is:
Volume = (Length × Width × Thickness) ÷ 1000 with all measurements converted from inches to centimetres first (multiply each measurement by 2.54).
Truth be told, you don’t really need to know the maths behind surfboard volume when you’re just starting out. Just keep in mind that different board shapes hold volume differently. Fuller boards like fish and mid-lengths and logs feel more stable and float better than performance shortboards.
It really comes into play when you’re buying your first board though. Most modern boards have their volume stamped on the tail or listed in the specs by the shaper. But if you’re looking at a secondhand board with no information, this formula gives you a reasonable estimate.
Learn more about surfboard volume myths.
What happens if you get the volume wrong?
Too little volume is by far the more common mistake and the more damaging one for progression.
Our surf coaches can spot it from a mile away. They see the person exhausted after 20 minutes, missing waves that should be catchable and a look of frustration slapped across their face.
Going too small too soon is one of the single biggest brakes on progression. Unfortunately we see it all too often. On the other side though is the problem of too much volume. It’s less common, for sure, but we still see it.
An oversized board can feel sluggish, hard to duck dive and resistant to turning. In more powerful waves it can feel like you’re riding on top of the water rather than through it. Manoeuvrability suffers noticeably once volume goes well past your ideal range.
The sweet spot is a board that keeps you buoyant, paddles efficiently and gives you just enough feedback to feel what the wave is doing.
Does volume tell the whole story?
No… and this is where it gets a bit more nuanced.
Two boards can have identical volume but feel completely different, depending on where that volume is distributed.
A fish with a wide, thick nose will ride very differently from a shortboard with the volume concentrated in the centre. Same litres, different personalities entirely.
How do wave conditions affect volume choice?
Quite a bit, actually. Here’s how to think about it:
- Small and weak waves = go bigger: The wave isn’t providing speed, so the board has to. Add more litres to catch softer, rolling waves more easily
- Bigger and more powerful waves = go smaller: The wave does the work, so extra foam just gets in the way. Drop down from your usual volume for better control and responsiveness
This is why experienced surfers ride different boards for different conditions. Volume is a big part of what changes. At Xanadu, matching the right board to the right conditions is something our coaches work through with you during your week.
A few other things worth knowing before you buy
- Don’t copy what the pros ride: Their boards are built for techniques and critical surfing that most of us will never accomplish (unless you do our advanced progression week, that is)
- Don’t go by length alone: A board’s volume depends on width and thickness too… always check the litre count.
- Fitness and age matter: Less paddle fitness means you’ll benefit from a few extra litres. Don’t be afraid to embrace the added foam!
- Factor in your wetsuit: Not so relevant for Lombok, but keep in mind a thick suit adds weight. Lean toward the higher end of your volume range in colder water.
- Epoxy boards float more: Moving from PU to epoxy? Drop 2 to 3 litres to keep the feel equivalent.
- More volume rarely hurts improvers: Better to be on a board that floats well and gets you on waves than one that looks cool in the carpark. Trust us on that
The short version (for those who scrolled straight here)
- Surfboard volume = litres = float = buoyancy
- More volume = easier to paddle, catch waves and maintain balance
- Less volume = more responsive but harder to surf well without serious experience
- Use the Guild Factor formula: weight (kg) × GF based on skill level = ideal litres
- Too little volume is far more common than too much and far more damaging to progression
- Volume is the starting point… shape, rocker, rails and wave conditions complete the picture
- When in doubt, ask someone who knows the waves you’re riding
Understanding surfboard volume doesn’t make you a better surfer overnight. But it helps you choose equipment that actually suits you. The right board makes a tangible difference to how quickly you improve and, more importantly, how much fun you have in the process!
Frequently Asked Questions About Surfboard Volume
Q. What is surfboard volume and why does it matter?
Surfboard volume, measured in litres, determines how buoyant a board is. This directly affects your ability to paddle, catch waves and stay stable while riding. Getting the right volume for your weight and skill level is one of the most important factors in choosing a board.
Q. What volume surfboard should a beginner ride?
Beginner surfers should aim for a board volume roughly equivalent to 100% of their body weight in kilograms. A 70kg beginner is looking at around 70 litres, though many start on foamies above this which is completely appropriate and actually accelerates learning.
Q. Does board shape affect the ideal volume?
Yes. Different board types sit in very different volume ranges. Fish boards typically range from 25–45 litres, shortboards from 24–40 litres and longboards or logs from 60 litres upward.
Q. Are epoxy boards different in terms of volume?
Epoxy or EPS foam boards are more buoyant than traditional PU boards at the same volume. If you’re switching from PU to epoxy, it’s generally worth dropping 2 to 3 litres to keep the feel consistent, otherwise the board may feel overly floaty and harder to engage through turns.
Q. Can my fitness level or age affect the right volume for me?
Absolutely. Paddle strength, stamina, core stability and how frequently you surf all factor into how much volume you need to perform well. If your fitness has dipped or you’re returning after time out of the water, adding a few extra litres makes sessions more enjoyable and productive.
Q. Should I use a volume calculator or just ask a shaper?
Both. A surfboard volume calculator gives you a solid starting range based on your weight and skill level. A shaper or experienced coach adds the nuance… surf conditions, board shape, fitness level and surfing style. Use the calculator to get in the ballpark, then get a second opinion from someone who’s seen you surf.
Want to talk boards?
Our Xanadu coaches love nerding out on all facets of surfing equipment. This education is actually part of your retreat experience.
