How to Choose Camping Sandals: Sizing and Fit Guide

Every reliable camping sandal fit starts with measuring both feet in centimeters and sizing to the longer one — not your everyday shoe size.

A sandal that fits right keeps your toes from catching on roots and your heel from riding off the back edge on the downhill. Brands build their charts around foot length instead of a shared US number, so treating “size 10” as a promise is where most campers go wrong. The whole method below takes one sheet of paper and about two minutes.

How Do You Measure Your Feet for Sandals?

Trace both feet at the end of the day, measure heel to longest toe, and size to the larger number, because left and right feet rarely match. Teva’s size guide spells out the routine: draw a straight line on paper, set it on a hard floor, stand with your heel and longest toe centered on the line, then mark both points at the back of the heel and the tip of the longest toe. Do it once per foot. Measure the distance between your marks on each sheet, and use the bigger result to find your size on the manufacturer’s conversion chart.

A wall version works just as well. Stand with your heels against a wall on a flat surface, mark the longest toe on each foot, and measure from the wall to each mark. Two details decide whether the number is usable:

• Measure in centimeters. Charts from Teva, Birkenstock, and Nike all publish foot length in cm, and that column is far finer-grained than US sizes.
• Measure at the end of the day. Feet spread and lengthen after hours of walking, and that is the size your foot will be on the trail.

Birkenstock’s fit guide takes the same approach, asking you to enter each foot’s measurement to return a recommended size. Its guide pages were UK and Hong Kong versions when checked, so run the numbers through the chart for the region you are actually buying from — the printed size on the box can differ by a half step between regional charts.

How Much Extra Room Should Sandals Have?

Expect roughly a half centimeter of movement room plus a little sole extending past your foot — about 5 mm added to foot length for movement, and 1.5 to 2 cm added to foot length to land on a sandal size. Those two numbers sound contradictory until you see what they measure. The 5 mm is the clearance your foot needs inside the footbed. The 1.5 to 2 cm is how much longer the sandal itself usually runs than your foot, because open sandals carry a lip of sole at the toe and heel.

Once they are on, a sizing checklist gives you the pass-or-fail test: 1/8″ to 3/8″ of sole should sit in front of your toes and behind your heel, and no part of the foot should hang over the edge. Toes that overhang catch on rocks; a heel that floats starts a blister on the first climb.

Why No Single US Sandal Size Exists

Sandals have no shared US sizing standard, so a 9 in one brand can fit like a 9.5 in another. Some makers use unisex sizing — a size 9/10 covers men’s 9 and women’s 10 — and publish the sandal’s actual length and width in centimeters by size. Others anchor their chart to US men’s sizes with women’s equivalents printed alongside.

Model shape matters as much as the number. Toe box width, strap placement, and footbed contour change the fit of two sandals with identical length, which is why you check the chart for the exact model you want, not the brand overall. Nike, for instance, publishes sandals size charts by region for US men’s and women’s sizing, and buying from a different regional store means matching that region’s conversion.

Two habits prevent most accidental wrong orders: never size from the last pair you owned, and when a brand offers a printable template, print it at 100% scale with no “fit to page” shrink, then verify against a ruler before you test toe and heel clearance on the outline.

If you would rather skip the chart work entirely, our roundup of the best camping sandals covers the models whose fit our testing found most predictable across whole sizes.

The Mistakes That Cause Returns

Nearly every sandal return traces back to measuring at the wrong moment or trusting a converted size label. Sandals are more forgiving than closed shoes across the straps, but the length still has to be right, because no amount of strap adjustment brings an overhanging toe back onto the sole. Walking a boot fit down a half size to get “snug” backfires here — sandals need the clearance, and the sole is designed for it.

Run the whole method once: measure both feet in centimeters at day’s end, use the longer one, add the room for movement, then confirm the sandal’s chart leaves 1/8″ to 3/8″ at the toes and heel. If you are between two sizes after that, the longer one is the safer pick for camping, where feet swell and a too-short sole turns every downhill step into a jammed toe.

Bottom line: measure both feet in centimeters at the end of the day, size to the longer foot, and verify 1/8″ to 3/8″ of sole in front of the toes and behind the heel. That single sequence, applied to the exact model’s chart, is what keeps your feet stable on granite and soft ground alike.