Case 1
- How much do you weigh?
- 75kg
- What is your ability?
- Intermediate — turning confidently
- How is your paddle fitness?
- Average fitness
31.5L
Open with these valuesSurfboard Volume Calculator
31.5L
Result: 31.5 LVolume is body weight in kilograms times a coefficient for ability: about 1.0 for a beginner, 0.42 for an intermediate, 0.32 for an expert, then nudged for paddle fitness. A 75 kg intermediate of average fitness lands near 31.5 litres. Shop within about eight per cent either side of that.
The numbers at a glance
Held fixed: What is your ability? Intermediate — turning confidently, How is your paddle fitness? Average fitness.
| How much do you weigh? (kg) | Result (L) |
|---|---|
| 40.0 | 16.8 |
| 60.0 | 25.2 |
| 75.0Your value | 31.5 |
| 80.0 | 33.6 |
| 100.0 | 42.0 |
Worked examples
Case 2
- How much do you weigh?
- 80kg
- What is your ability?
- Beginner — learning to stand up
- How is your paddle fitness?
- Average fitness
80.0L
Open with these valuesCase 3
- How much do you weigh?
- 90kg
- What is your ability?
- Expert — high-performance surfing
- How is your paddle fitness?
- Fit and young — paddle often
27.4L
Open with these valuesHow it's calculated
litres = body weight in kg × ability × fitness factor
- StepEnter your body weight in kilograms.
- StepPick the ability level you surf at, in real conditions.
- StepPick your paddle fitness.
- ResultShop within about eight per cent either side of the answer.
Reference table
| Weight, ability, fitness | Coefficient | Litres |
|---|---|---|
| 70 kg, advanced, average | 0.36 | 25.2 |
| 90 kg, expert, fit | 0.304 | 27.4 |
| 75 kg, intermediate, average | 0.42 | 31.5 |
| 75 kg, intermediate, less fit | 0.462 | 34.7 |
| 80 kg, beginner, average | 1.00 | 80.0 |
Questions
What surfboard volume do I need?
Multiply your weight in kilograms by a coefficient for your ability — roughly 1.0 for beginners, 0.42 for intermediates, 0.32 for experts — then adjust for fitness. A 75 kg intermediate of average fitness lands around 31.5 litres.
Why does volume matter more than length?
Volume captures float across every outline, while length alone does not. A short wide board and a longer narrow one can hold identical litres and paddle almost the same, which is why shapers print litres on the board.
How much volume should a beginner have?
About one litre per kilogram of body weight, sometimes more on a soft-top. For an 80 kg learner that is roughly 80 litres — the territory of foamies and big longboards, where paddling is easy and the board stays stable.
I know my weight in pounds — what do I enter?
Divide pounds by 2.205 to get kilograms. 165 lb is about 75 kg and 200 lb about 91 kg. The coefficients are defined per kilogram, which is how volume charts are written.
When should I drop to a lower volume?
As paddle fitness and wave reading improve and the waves get more powerful. Less volume sits deeper, holds a steep face and turns harder, but it punishes a slow pop-up.
How exact is the recommended volume?
It is a guideline, not a specification. Coefficients differ between shapers and fitting tools, and wave type, construction and wetsuit buoyancy all shift the ideal. Demo boards near the number before you buy.
Sources and last check
Information, not professional advice.