BoardCAD Volume Calculator

Calculator Inputs

Board name

Dimension unit

Board length

Maximum width

Maximum thickness

BoardCAD shape factor (%)

Nose fullness (%)

Tail fullness (%)

Rail reduction (%)

Rocker reduction (%)

Foil reduction (%)

Concave reduction (%)

Deck crown reduction (%)

Extra volume offset (liters)

Rider weight (kg)

Water density (kg/L)

Formula Used

Box Volume = Length × Width × Thickness

End Modifier = 0.90 + 0.10 × ((Nose Fullness + Tail Fullness) ÷ 200)

Loss Multiplier = (1 - Rail Loss) × (1 - Rocker Loss) × (1 - Foil Loss) × (1 - Concave Loss) × (1 - Deck Loss)

Net Coefficient = Shape Factor × End Modifier × Loss Multiplier

Board Volume = Box Volume × Net Coefficient + Extra Offset

The script converts all dimensions to centimeters first. It then returns liters, cubic inches, cubic feet, and cubic centimeters.

How To Use This Calculator

Enter the board name for easy record keeping.
Select the dimension unit used in your BoardCAD design.
Enter maximum length, width, and thickness.
Set the shape factor for the board outline and section fullness.
Adjust nose, tail, rail, rocker, foil, concave, and deck values.
Enter rider weight and water density for buoyancy comparison.
Press the calculate button to view the result below the header.
Use CSV or PDF buttons to save the calculation.

Example Data Table

Board Type	Length	Width	Thickness	Shape Factor	Typical Result
Shortboard	72 in	20 in	2.5 in	56%	About 27 L
Fish	68 in	21 in	2.65 in	61%	About 32 L
Funboard	84 in	22 in	3 in	60%	About 46 L
Longboard	108 in	23 in	3.25 in	63%	About 72 L

Understanding BoardCAD Volume

Board volume is a practical physics value. It tells how much space the board occupies. In surfing and board design, volume links directly to buoyant force. More volume usually gives more float. Less volume usually gives quicker response. BoardCAD models this value from a three dimensional shape. A quick calculator helps when exact model data is unavailable.

Why Volume Matters

A board pushes water away as it floats. The displaced water creates an upward force. This idea follows Archimedes principle. If the board and rider need more support, extra liters help. If the rider wants sharper turns, lower liters can help. The best value depends on mass, skill, wave type, and board purpose.

Using Shape Factors

Simple length, width, and thickness form a box volume. A real board is not a box. The nose tapers. The tail tapers. Rails are rounded. Rocker lifts parts of the board. Foil removes thickness near the ends. The calculator applies correction factors for these changes. The shape factor estimates outline fullness. The rail factor estimates lost corner volume. The rocker factor estimates lift and curve loss. The foil factor estimates thickness distribution.

Reading The Results

The main result appears in liters. Liters are common in board design. The calculator also gives cubic inches, cubic feet, and cubic centimeters. Buoyancy support is shown as a water displacement estimate. This estimate helps compare designs. It is not a replacement for testing a finished board.

Practical Design Notes

Use measured maximum dimensions for rough planning. Use conservative factors for narrow noses or pin tails. Use higher factors for fish outlines and fuller rails. Use lower factors for heavy rocker or thin foils. Check several scenarios before cutting foam. Small changes in width and thickness can move volume quickly. Save the CSV for records. Download the PDF for sharing. The example table gives starting points for common design comparisons.

Limits And Care

This calculator uses idealized factors. It cannot read every BoardCAD control point. It also cannot measure glass, fins, plugs, or hidden concaves. Treat the answer as a design estimate. Compare it with known boards. Keep notes after each ride. Better records make later shapes more accurate. Repeat calculations whenever the design changes again.

FAQs

What is BoardCAD volume?

BoardCAD volume is the estimated three dimensional space inside a board shape. It is usually expressed in liters and helps compare float, stability, and design behavior.

Is this the exact BoardCAD file volume?

No. This calculator estimates volume from dimensions and correction factors. Exact BoardCAD volume depends on the complete digital shape and control points.

Which unit should I choose?

Choose the unit used for your measurements. The calculator converts inches, feet, or centimeters into centimeters before calculating volume.

What is a shape factor?

The shape factor adjusts the box volume into a board-like volume. Fuller outlines need higher values. Narrow, tapered, or performance shapes need lower values.

Why include rail reduction?

Rails remove corner volume from a rectangular box. Rounded, thin, or tucked rails usually reduce total board volume more than boxy rails.

What does rocker reduction mean?

Rocker lifts nose and tail sections. That curve reduces the effective foam volume compared with a straight rectangular block.

Can I use this for paddleboards?

Yes, if you adjust the dimensions and factors carefully. Large boards may need higher shape factors and lower rocker losses, depending on design.

Why is water density included?

Water density helps estimate displaced water support. Salt water is usually denser than fresh water, so it can provide slightly more support.