Volume CalculatorAI
PalakasanVolume (L) ≈ Length × Width × Thickness × Foil Coeff × 0.016387

Calculator ng Dami ng Surfboard

Tukuyin ang pinakamainam na dami ng litro ng surfboard batay sa timbang ng surfer, antas ng kasanayan, at lakas ng alon.

Surfboard Volume & Guild Factor

Liters • Surfer weight • Guild ratio & recommendation

Presets:
Performance ShortboardVolume: 29.2 Liters (0.39 GF)Length6'0" (72 in)Width19.25 inThickness2.38 inRockerAggressive PerformanceFoil Factor: 0.54 • Squash Tail
1. Board Dimensions
ft
in
in
in
2. Calculated Board VolumeBuoyancy
3. Surfer Guild Factor (GF) Matching
Current Board Guild Ratio (GF)Ideal Range: 30.0 - 33.8 L
0.39 GFWell Balanced
Formulas, calculation steps & FAQs below↓
Formulas & Calculation Guide

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

Skill Level Guild Factor (GF) Recommended Liters for 70 kg (154 lb) Recommended Liters for 85 kg (187 lb)
Pro / Elite 0.32 – 0.35 22.4 – 24.5 L 27.2 – 29.8 L
Advanced 0.35 – 0.38 24.5 – 26.6 L 29.8 – 32.3 L
Intermediate 0.39 – 0.45 27.3 – 31.5 L 33.2 – 38.3 L
Novice / Weekend 0.46 – 0.55 32.2 – 38.5 L 39.1 – 46.8 L
Beginner 0.60 – 0.85+ 42.0 – 59.5+ L 51.0 – 72.3+ L

Frequently Asked Questions

Expert answers to common calculations, unit conversions, and dimensional requirements.

Why is surfboard volume measured in liters instead of cubic inches or feet?↓
Liters directly represent buoyant displacement in water (1 liter of volume displaces 1 kilogram of fresh water, or roughly 1.025 kg of saltwater). This provides an intuitive, metric-friendly correlation between the surfer's body weight in kilograms and the board's buoyancy.
What is the Guild Factor (GF) in surfing?↓
The Guild Factor (or Volume-to-Weight Ratio) expresses the ratio between surfboard volume in liters and the surfer's body weight in kilograms: GF = Volume (L) / Weight (kg). For example, a 75 kg surfer riding a 30 L board has a GF of 30 / 75 = 0.40.
What Guild Factor should I target for my surfing skill level?↓
Typical Guild Factor ranges: Advanced / Pro Shortboard: 0.32 – 0.36; Intermediate All-Around: 0.38 – 0.44; Beginner / Transitioning: 0.48 – 0.58; First-Time / Foamie: 0.65 – 0.85+.
How accurately can volume be calculated from Length × Width × Thickness?↓
Because surfboards taper toward the nose, tail, and rails, multiplying bounding box dimensions (L × W × T) yields a gross cuboid. Applying an accurate foil distribution coefficient (typically 0.52 for knife-edge performance shortboards to 0.58 for full-rail fishes and 0.64 for modern mid-lengths) approximates computer CNC CAD volumes within 3% to 5%.

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