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Fin Selector · free

What fins should I use? Find the right ones for your board in 1 minute

Replacing your fins, trying something different, buying your first set or packing for a surf trip: we point you to real FCS and Futures fins, and where to buy them.

  • FCS & Futures
  • The brands’ own measurements
  • No sign-up

How it works

  1. What you’re afterReplace your fins, try something different, or your first set. Don’t know yours? Fine: we start from your weight.
  2. How they feel, or what you wantSlides out, no drive off the bottom… or just more speed in small waves. You pick.
  3. Fins that fix itA small step and a bigger one in the right direction, with the why and the shops that sell them.

An example

A real selector result

You rideFCS II Performer, M75–85 kg · medium waves · “slides out in hard turns”
Small stepFCS II Mayhem Pivot, L+4% depth · +3% area
Bigger stepFCS II Al Merrick, XL+7% depth · +11% area

Why: more depth and area hold the tail in the turn.

Fin size chart by weight

Fin size goes by your weight. Each brand prints its own ranges:

SizeFCSFutures
XSunder 55 kg (121 lb)34–48 kg (75–105 lb)
S55–70 kg (121–154 lb)43–61 kg (95–135 lb)
M65–80 kg (143–176 lb)57–79 kg (125–175 lb)
L75–90 kg (165–198 lb)75 kg+ (165 lb+)
XL85 kg+ (187 lb+)—

The ranges overlap. Between two sizes, weight alone doesn’t settle it: the selector also asks how your fins feel.

Questions

What size fins do I need?

It goes by your weight: see the chart above. FCS and Futures ranges aren’t the same, so check the one for the brand your board’s boxes take.

FCS or Futures?

Your board’s fin boxes decide, not the brand. FCS II boxes take FCS II fins (classic FCS I fins also fit, with grub screws and FCS’s infill kit); FCS I plugs and Futures boxes take only their own.

Thruster or quad?

Count your boxes: three usually means a thruster, four is a quad, and five lets you run either. The selector covers thrusters, quads, twins and more.

Carbon or fibreglass?

Fin makers disagree on what flex actually does, and we found no study that tests it on a surf fin. So the selector picks by shape (base, depth, area and sweep), not by material.

Do you sell fins?

No. We recommend and show where to buy. Some shop links pay us a small commission at no extra cost to you, and that never changes the pick.

Where do the measurements come from?

From the brands themselves: base, depth, area and sweep published by FCS and Futures, compared with fins of the same kind.

Do I need to sign up?

No. It’s free and takes about a minute. The email at the end is optional.

Does it cover FCS I, quads, twins?

Yes: FCS I, FCS II and Futures, in thrusters, quads, twins and more.

Learn about fins