A boardshort that catches on your knee during a pop-up, balloons on a swim or rubs your thighs raw can wreck an otherwise cracking beach day. Knowing how to choose boardshort length comes down to more than what looks good on the rack. Your height, the cut of the short, where you’ll wear it and how freely you need to move all matter.
For a quick starting point, most surfers find a mid-length boardshort that finishes a few centimetres above the knee gives the best all-round balance. But there is no single right answer. A short, performance-focused pair suits one person perfectly, while a longer, roomier style is the go for another.
How to Choose Boardshort Length for Your Plans
Boardshort lengths are usually listed as an outseam, measured from the top of the waistband to the hem on the outside of the leg. You’ll commonly see lengths from around 16 to 21 inches. That number is useful, but where the hem lands on your body is the real test.
A 16-inch boardshort generally sits high on the thigh. It is a popular choice for surfers who want less fabric around their legs, swimmers who want an easy-moving fit, and anyone after a more modern, shorter look. It can feel especially good in warm water, as there is less wet material to drag about between surfs.
An 18-inch length is the dependable middle ground. On most people, it lands around mid-thigh to just above the knee. It offers enough coverage for a family beach day or a paddle out, without getting in the way when you squat, pop up or sit on your board. If you are buying your first decent pair of boardies and want one style for most summer missions, this is often a safe bet.
A 19- to 21-inch boardshort gives more coverage and a classic surf silhouette. Taller blokes may find this range sits exactly where an 18-inch short sits on someone shorter. It also suits those who simply feel more comfortable with a hem closer to the knee. The trade-off is that a longer, loose cut can hold more water and occasionally catch behind the knee during deep bends, particularly if the fabric is stiff or the leg opening is wide.
Start With Where the Hem Sits, Not the Tag
Two boardshorts with the same listed length can look completely different. A slim cut will sit closer to the leg, while a relaxed fit may flare out and appear longer. A high-rise waistband changes the position too, as does your own build.
Try them on standing naturally, then do the movements you actually make at the beach. Take a few big steps, squat low, lift one knee and mimic a pop-up. The hem should not dig into the back of your knee, pull tightly across your thigh or ride up uncomfortably. For surfing, this little movement test tells you far more than a mirror pose ever will.
If you are shopping online, grab a pair of shorts you already like and measure the outside seam from the top of the waist to the hem. Compare that figure with the product’s listed outseam, then allow for any difference in waist height or fit. It is a simple way to avoid guessing.
Your Height Changes the Equation
Length is relative. A 20-inch boardshort can look neatly above the knee on a tall surfer but feel long and restrictive on someone shorter. Likewise, a 16-inch style may be a clean mid-thigh fit on a shorter person and a very short cut on someone with long legs.
As a rough guide, shorter surfers often prefer 16 to 18 inches, average-height surfers commonly land in the 18 to 19-inch range, and taller surfers may be most comfortable from 19 to 21 inches. These are starting points, not rules. Body proportions matter more than the number on your licence.
Think About Your Surfing Style
If your boardshorts are for proper surf sessions, freedom through the hips and thighs is the priority. Shorter to mid-length styles are usually easier for repeated pop-ups, wide stances and duck-dives. Look for four-way stretch fabric, a gusset or panel through the crotch, and a flat waistband that stays put under your wetsuit or rash vest.
For longboarders, cruisy summer waves or beach-to-café days, a slightly longer boardshort can feel spot on. You may value coverage, pockets and a relaxed cut more than a super-light competition feel. There is nothing wrong with choosing comfort over the most technical option, provided the shorts still move with you in the water.
For swimming, bodyboarding or playing in the shorebreak with the kids, avoid an overly long pair with a heavy fabric. Once soaked, extra material can feel baggy and slow to dry. A 16- to 18-inch short in quick-drying stretch fabric is often the easy choice for an active day between the flags.
Waist Fit Matters as Much as Length
A good length cannot rescue a waistband that slips every time you paddle. Boardshorts should sit securely at your natural waist or just below it, depending on the style, without needing the drawcord pulled painfully tight. You should be able to breathe, sit and bend comfortably.
Most boardshorts use a fixed waistband with a lace-up fly. This gives a clean, secure fit for surfing, but it means you need to get the size right. Some styles include a stretch panel, adjustable side tabs or an elastic back section, which can be handy if you are between sizes or like a more forgiving fit for all-day wear.
Be wary of sizing up just to gain length. A loose waist creates bunching, chafing and the constant need to readjust after a wipe-out. Instead, find the right waist first, then choose a model with the length and cut that suits your legs.
Fabric and Details Can Change the Feel
The best boardshort length on paper can still feel ordinary if the construction is wrong for your use. Lightweight recycled polyester blends dry quickly and hold their shape well. Stretch fibres add mobility, especially when you are surfing regularly. Softer fabric and bonded or flat seams can make a real difference on long, salty days.
Check the inside as well. Some boardshorts have a built-in liner, while many surf boardies do not. A liner can be useful for swimming and general beach wear, but some surfers prefer no liner for less bulk and faster drainage. If you are prone to chafe, choose a smooth inner finish and make sure the short is not too tight through the upper thigh.
Pockets are another trade-off. Zip or flap pockets are handy for walking the foreshore, but you do not need a pocket full of sand while surfing. A secure rear pocket with a key loop is usually plenty for a surf-focused pair.
Choose for Confidence, Not Just Trends
Boardshort trends swing from short and retro to long and loose, but your best pair is the one you forget you are wearing once you hit the water. If you feel self-conscious, restricted or constantly fiddling with the fit, it is not the right cut for you.
For families buying boardshorts for kids, leave enough room for running, swimming and sitting on a soft-top, but avoid hems that reach below the knee. Longer shorts can snag, hold water and make it harder for young surfers to move freely. A secure waist and soft, quick-drying fabric will matter more than any graphic.
If you are still torn between two lengths, go for the pair that finishes just above your knee and feels easy through a squat. It is the versatile choice for most Australian beach days, from a dawn paddle at Newcastle to a holiday swim further up the coast. Pop into Oceanfire Surf and say g’day if you want to try a few cuts side by side. The right boardies should let you focus on the waves, not what your shorts are doing.