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Understanding Surfboard Volume & Hydrodynamics

Before computer-aided design (CAD) and CNC milling machines revolutionized surfboard manufacturing, surfers bought boards strictly by three linear measurements (e.g., 6’2” × 18 1/2” × 2 3/8”). However, two boards with identical length, width, and center thickness can paddle and turn completely differently depending on how foam is foiled into the nose, tail, and rails.

The Volume Approximation Formula

Volume (Liters) ≈ Length_in × Width_in × Thickness_in × Foil_Coeff × 0.016387

Where:

• Length: Board length in total inches (e.g., 6’0” = 72 inches)
• Width: Center width in inches
• Thickness: Maximum deck thickness in inches
• Foil Coefficient:
  • Performance Shortboard: 0.51 – 0.53
  • All-Around Thruster / Hybrid: 0.54 – 0.56
  • Fish / Groveler: 0.57 – 0.59
  • Funboard / Mid-length: 0.60 – 0.63
  • Longboard / Log: 0.64 – 0.68
• 0.016387: Conversion factor from cubic inches to liters

Surfboard sizing – calculation example

Let’s find the ideal board volume for an intermediate surfer weighing 75 kg (165 lbs):

1. Surfer body mass: weight = 75 kg.
2. Skill level: level = Intermediate (target GF: 0.39 - 0.45).
3. The calculation results are available for you: recommended volume = 29.3 – 33.8 Liters.
4. Testing a board with dimensions: 6'0" × 19.75" × 2.5" (hybrid foil: 0.55) yields estimated volume = 32.1 L.

💡 In smaller or weaker surf, err toward the higher end of your volume range to paddle in earlier and carry speed over flat sections.

Recommended Volume by Surfer Weight & Skill