Blundstone Sizing: How to Convert Your US Size to AU/UK

Order Blundstones by converting your US size to the AU/UK scale printed on the boot, not by matching your sneaker size. For men the usual starting point is your US size minus 1, and for women it is your US size minus 3. A men's US 10 becomes a size 9; a women's US 8 becomes a size 5.

That is only a starting point, but it is a reliable one. Blundstone is an Australian brand, its boots are labeled in Australian sizes (which match UK sizes), and the most common mistake is ordering the same number you wear in sneakers. Below you will find the conversion logic, two tables built from our size data, and the fit checks that tell you whether the first guess is right.

Why Blundstones use AU/UK sizes

The number stamped on the boot is an AU/UK size. Australia and the UK share the same scale, so if you already know your UK size from other brands, you can use it as a reference. US shoppers need one extra step.

The US scale starts at a different point than the UK scale, and it does so differently for men and for women. That is why one subtraction rule does not work for everyone. The men's gap is one size, the women's gap is three, and mixing them up is the fastest way to end up with boots that are far too big or far too small.

The conversion rule for men

Take your US men's size and subtract 1. A US 9 is an AU/UK 8, a US 11 is a 10, and a US 12 is an 11. If you are not sure of your US size, measure your feet and run the numbers through the shoe size calculator first.

This lines up closely with sneaker charts. On the standard chart in our data, a men's US 8 is a UK 7 and a US 12 is a UK 11, so for most of the range the men's gap is exactly one size. The exception is at the small end, where sneaker charts shrink the gap to half a size, as the first rows below show.

The conversion rule for women

Take your US women's size and subtract 3. A US 8 is an AU/UK 5, a US 9 is a 6, and a US 10 is a 7. This is the step that catches women out, because sneaker conversions do not behave this way. On the standard chart in our data, a women's US 8 is a UK 5.5, a gap of only 2.5.

So a woman who reads her sneaker UK size (5.5) off a conversion chart and orders that would end up half a size too big in Blundstone's own system. Run the subtraction on the US number, not on a sneaker UK size.

What about half sizes?

This is where sources disagree. Some guides say Blundstone half sizes are the same length as the whole size below with a bit more width. Others treat them like ordinary half sizes. What you can actually buy depends on the style and the retailer, since many models are sold in whole sizes.

Our advice: if your conversion lands on a half size and the model comes in halves, buy it and judge length with the checks below rather than assuming. If the conversion lands on a half and only whole sizes exist, choose the size that fits your foot length and decide between the two by how the sides feel.

How much room should you have?

Blundstones are pull-on boots, so the fit comes from the shape of the boot and its elastic side panels. This checklist is the same one we use for any Chelsea-style boot.

• Toe room. Your toes should not touch the end when you stand and push forward. A thumb's width in front is a good target.
• Heel. A small amount of heel lift is normal in a new boot, and it shrinks as the sole softens. If your heel rides up and down a lot when you walk, the boot is too big.
• Width and instep. The sides should feel snug, not squeezed. Some pressure at the front of the ankle opening, where the V-shaped elastic sits, is typical.
• Pull-on test. The boot should need a firm pull on the tabs and seat itself with a settling feel. If your foot drops in with no resistance, try the next size down.

Tap the toe of the boot on the floor a few times to push your foot all the way forward, then slide a finger behind your heel. If the finger fits, the length is about right. If your toes hit the front, the boot is too short.

Typical ranges

The simple rule is a starting point, and some wearers end up a little lower than the formula suggests. Commonly reported adjustments are another half to one size down for men, and up to half a size below the formula for women. Treat these as ranges to try, not guarantees, and take both neighbors into the fitting room if you can.

Leather and elastic both give a little with wear. A boot that feels pleasantly snug on day one is a better bet than one that feels roomy, because the roomy one only gets looser.

Blundstone vs your usual sneaker size

If you wear a men's 10 in Nike, your Blundstone will be about a 9 on the AU/UK scale. That is the same foot length as the sneaker. It is not a smaller boot, only a different label. Our Nike sizing guide shows how sneaker charts map US to UK and EU, which helps you compare.

If your sneaker size runs half a size above your true measurement, which is common for people who like a roomy sneaker, the formula will give you a boot that is too long. In that case go back to your measurements and build the Blundstone size from your actual foot length. Our foot measuring guide walks through it.

Wide feet and thick socks

Most Blundstone models come in one standard width, so wide feet need more careful picking. If the forefoot feels tight but the length is good, a half size up is the usual fix where one is offered. The shoe width chart explains whether your feet need more than a standard width.

Socks matter too. A thin dress sock and a thick wool sock change the fit by roughly half a size. Try the boots on in the socks you will actually wear.

Worked examples

A man who wears US 10.5 in Nike. Subtract 1 and you get 9.5. If the model you want comes in 9.5, try it. If it only comes in whole sizes, the 9 is the snugger choice and the 10 the roomier one. With a thumb's width of room in your sneaker, the 9 is likely right; if you like a roomy fit, take the 10.

A woman who wears US 7 in running shoes. Subtract 3 and you get 4. That feels strange next to a sneaker UK size of 4.5 on our standard chart, but the half-size gap is the whole point of the different rule. If a size 4 pinches, the next size up is 5, and you can decide from toe room.

A man who is between US 8.5 and 9. That maps to AU/UK 7.5 or 8. Because pull-on boots are hard to tighten once they are loose, the smaller of the two is the better first try, as long as your toes are not pressed against the end.

Three mistakes to avoid

• Using the sneaker UK size for women. The 2.5 gap on a sneaker chart and the 3 gap on Blundstone are not the same, so the result can be half a size too large.
• Buying by the width of the foot opening. Because the boots pull on, people judge the fit by how easily the foot slides in. Judge by the heel and the ball of the foot instead.
• Trusting a half size to solve a tight forefoot. If the length is right and the forefoot is tight, a longer boot adds heel slip. A different model, or thinner socks, can be a better answer.

Finding your final size

Follow this order: convert your US size using the rule for your gender, check the result against your foot length, try the boot with real socks, and adjust by half or one size based on heel hold and toe room. For most buyers that lands within one size of the formula result.

When you order online, compare your choice with the retailer's own conversion before you pay, and walk in the boots on a clean indoor floor for twenty minutes before you decide to keep them. If you are between two sizes, the smaller one is usually the better bet for a pull-on boot. Our general boot fit guide covers the checks that apply to every type.