Choosing a surfboard: volume, size, and what actually suits your level

Surfboards are described by length, width, and thickness, but the number that actually predicts how a board behaves under you is volume, measured in litres. It combines all three dimensions into one figure: how much the board floats.

Float determines how easily you paddle, how early you catch waves, and how stable the board is under your feet at low speed. Two boards of identical length can differ by six litres and feel like different sports. When comparing boards, compare volume first and dimensions second.

Volume needs are usually expressed as a fraction of body weight in kilograms. As rough starting points:

• Beginner: 0.9–1.2 × body weight in litres. An 80 kg beginner wants roughly 72–95 L — a big, stable, forgiving board.
• Improving / early intermediate: 0.6–0.8 ×. The same surfer: around 48–64 L.
• Confident intermediate: 0.45–0.6 ×. Around 36–48 L.
• Advanced: 0.35–0.45 ×, and highly dependent on wave quality and fitness.

These are starting points, not verdicts. Adjust up for weak or small waves, being less fit, surfing infrequently, or being over about forty. Adjust down only for powerful waves and consistent time in the water. Age and frequency matter more than ego: someone surfing twice a month needs more volume than the same person surfing four times a week.

• Length adds paddle speed and stability in a straight line, and makes the board harder to turn tightly. Longer boards catch waves earlier.
• Width, especially through the middle, adds stability and planing in weak waves — but a wide board is slower rail to rail, which blunts turning.
• Thickness adds float without adding footprint, though too much makes a board feel corky and hard to sink into a turn.
• Rocker — the curve from nose to tail — isn't in the volume number but matters: more rocker fits steeper waves and turns tighter; flatter rocker paddles and glides better in weak surf.

• Soft-top / foamie (7'–9'): the correct first board, and safer for everyone around you. Enormous float, catches almost anything. Ride it longer than your pride suggests.
• Longboard (8'+): glide, trim, and early wave entry. A different discipline more than a beginner concession — plenty of skilled surfers ride nothing else.
• Funboard / mid-length (6'6"–8'): the classic step down from a foamie. Keeps real float while starting to turn properly. The most under-rated board category for improving surfers.
• Fish (5'2"–6'2", wide, flat): built for small, weak, gutless waves. Fast and loose in conditions where a shortboard is useless.
• Shortboard (5'8"–6'4"): high performance in good waves, and punishing in bad ones. Needs steep, powerful waves and a surfer who can generate speed.

The standard progression error is jumping to a shortboard because that's what good surfers ride. It's backwards. Good surfers ride small boards because they're already good; the board didn't make them.

Under-volumed, you catch fewer waves, paddle harder, and spend the ride fighting for stability instead of practising turns. Fewer waves ridden means less feedback, which means slower improvement — and it can cost a season or more.

The reliable path is the opposite: keep enough volume to catch waves easily, get hundreds of rides, and let the board shrink only when you're consistently outgrowing it. More waves on a bigger board beats fewer waves on a cooler one, every time.

Concrete signs you've genuinely outgrown a board: you catch waves easily and consistently, you're on your feet before the wave has fully stood up, you can turn but the board won't respond as fast as you want, and it feels like it's floating too high through turns.

That is a very different feeling from 'this is hard, maybe a smaller board would help' — which almost always means the opposite. When you do step down, do it in small increments, and keep the old board for weak days. Most improving surfers benefit far more from two appropriate boards than one aspirational one.