Surfboard tools: volume from dimensions, and volume from your weight
Updated 2026-09-19
Two small calculators live here, both worked out from the same 150-board log behind the rest of this site. Neither asks for an email address, neither stores anything on your device, and neither sends your numbers anywhere. Enter the numbers, get an answer, close the tab.
The first tool takes a board's length, width and thickness and returns an estimated volume in liters, calibrated against boards in the log that have both a measured volume and clean dimensions. The second works the other way: it takes your weight, ability, age band and the wave size you surf most, and returns a volume range, then shows real boards from the log that sit in that range.
Why a calculator instead of a chart
A printed volume chart gives one number per weight bracket. It cannot account for a coefficient that shifts by shape, and it cannot show you an actual board carrying that volume so you have something concrete to compare against. Both tools here try to fix that: the dimension tool states its error band honestly instead of pretending to a precision the data does not support, and the weight tool always points at boards that exist rather than a hypothetical.
Where to start
If you already have a board's dimensions, in hand or from a listing, and want to know what volume they add up to, use volume from dimensions. If you are starting from your own weight and want a target range before you go looking at boards, use weight to volume. The surfboard volume explained page covers what the liter number is actually telling you, which is worth reading alongside either tool.
Questions people ask
Are these tools more accurate than a shaper's estimate?
Not necessarily. A shaper who has built a hundred boards in one outline knows that outline's volume behavior better than any general formula. What the dimension tool adds is a stated error band, built from real boards in the log, rather than a single confident number with no context.
Do either of these tools store my information?
No. Nothing you type is saved, sent anywhere, or kept after you close or reload the page.
Which tool should I use first?
If you have a specific board's dimensions, start with the volume tool. If you are working out what to look for before you have a board in mind, start with the weight tool.