Fish Surfboard Size Calculator
Use this fish surfboard volume calculator to get a practical starting point for length, width, thickness, and liters.
Note: This gives a strong starting range. Fine-tune with your shaper and local wave conditions.
How to use a fish surfboard size calculator
A fish is not just a shorter shortboard. It is usually wider, carries more foam through the chest, and has a different plan shape designed for speed and flow in weaker surf. That means sizing a fish surfboard is mostly about balancing volume, then tuning length, width, and thickness to match your skill and wave type.
If you undersize a fish, it can feel sticky and hard to paddle. If you oversize it too much, it may feel corky and hard to control in turns. The calculator above gives a practical middle ground so you can start with confidence.
What the calculator considers
1) Body size
Your weight strongly influences target liters. Height helps estimate board length and rail line.
2) Skill level
Beginner and lower-intermediate surfers generally need more foam to catch waves early and build consistency. Advanced and expert surfers can go lower in volume for tighter control.
3) Wave profile
Small, soft waves reward extra glide and planing area. Steeper, punchier waves usually let you ride a slightly lower-volume fish with more hold.
4) Intended feel
- Grovel setup: easier paddling and faster acceleration in weak surf.
- All-around fish: balanced speed, paddle power, and maneuverability.
- Performance fish: a touch less foam for responsiveness.
General fish board sizing guidelines
Most fish boards are ridden shorter than your height, but wider than a performance shortboard. Typical ranges:
- Length: around 2" to 6" shorter than rider height (varies by skill/style)
- Width: roughly 19" to 22.5" for most adults
- Thickness: often 2.25" to 2.75"
- Volume: often 2L to 8L above your high-performance shortboard
| Rider Profile | Typical Fish Volume Target | Sizing Direction |
|---|---|---|
| Beginner | Higher end of your range | More width and thickness for wave count |
| Intermediate | Middle to upper range | Balanced paddle power and turning |
| Advanced | Middle range | Responsive but still easy speed |
| Expert | Lower to middle range | Sharper rails, tighter turning feel |
Fish vs shortboard volume: a simple rule
If you already know your shortboard liters, a fish often sits above that value:
- Beginner: shortboard + ~5 to 7 liters
- Intermediate: shortboard + ~3 to 5 liters
- Advanced: shortboard + ~2 to 3 liters
- Expert: shortboard + ~1 to 2 liters
This is why many surfers feel instantly more wave-catching confidence on a well-sized fish.
Practical tips before ordering or buying
Be honest about your local waves
If your everyday break is soft and crowded, bias larger. If your wave is clean and punchy, you can go slightly leaner.
Decide your priority
Do you want glide and fun lines, or snap and attack? Set your board around the sessions you have most, not the perfect day you get once a month.
Talk to your shaper with real numbers
Bring your calculator result, current board dims, and your best/worst conditions. Good shapers can adjust rocker, rail, and tail to make those liters work better for your break.
Frequently asked questions
Can a beginner ride a fish?
Yes, especially in small surf. Just avoid going too short too early. Keep enough liters for easy paddling and early takeoff.
Should a fish be shorter than a shortboard?
Usually yes in length, but not in foam. A fish is often shorter yet wider and fuller, so total volume can be higher.
What if Iām between two sizes?
If you want easier wave count, go up. If you want tighter turning and already surf consistently, go down.