There's nothing more frustrating than ordering a cap online only to find it either perches awkwardly on top of your head or squeezes uncomfortably tight. Understanding how to properly measure your head and interpret cap sizing systems is essential for finding headwear that fits well and looks great.
This guide will walk you through the measurement process, explain the different sizing systems you'll encounter, and help you navigate the sometimes confusing world of cap fits.
How to Measure Your Head
Measuring your head circumference is simple and requires only a flexible tape measure. If you don't have one, a piece of string and a ruler will work just as well.
Step-by-Step Measurement Process
- Position the tape: Wrap your tape measure around your head, placing it about 1cm above your eyebrows at the front and around the widest part of the back of your head.
- Keep it level: Make sure the tape is level all the way around—not tilted up at the back or dipping at the front.
- Don't pull too tight: The tape should be snug but not compressing your skin. You want to replicate how a comfortable cap would sit.
- Note the measurement: Read the measurement where the tape overlaps. This is your head circumference in centimetres.
- Measure twice: Take the measurement again to confirm accuracy.
If using string, mark where it overlaps, then lay it flat against a ruler to get your measurement. Add about 0.5cm to your measurement if you plan to wear the cap over thicker hair or if you prefer a slightly looser fit.
Understanding Sizing Systems
Cap sizing can be confusing because different brands and styles use different systems. Here's a breakdown of what you'll encounter:
Fitted Cap Sizes
Fitted caps use numbered sizes that correspond to specific head circumferences. This system is most common with brands like New Era. The sizes typically range from 6 7/8 to 8, with each eighth representing approximately 0.6cm.
📏 Fitted Cap Size Chart
- Size 6 7/8: 54.9cm head circumference
- Size 7: 55.8cm head circumference
- Size 7 1/8: 56.8cm head circumference
- Size 7 1/4: 57.7cm head circumference
- Size 7 3/8: 58.7cm head circumference
- Size 7 1/2: 59.6cm head circumference
- Size 7 5/8: 60.6cm head circumference
- Size 7 3/4: 61.5cm head circumference
- Size 8: 63.5cm head circumference
S/M/L Sizing
Many adjustable caps use small, medium, and large designations. These are less precise than fitted sizes and can vary significantly between brands. Generally:
- Small: 54-56cm
- Medium: 56-58cm
- Large: 58-60cm
- XL: 60-62cm
One Size Fits Most
Adjustable caps with snapback, strapback, or Velcro closures are often sold as "one size fits most." These typically accommodate head circumferences from about 54cm to 60cm. If your head is smaller or larger than this range, you may find one-size caps don't work well for you.
Adjustable Closure Types
Understanding the different closure systems helps you choose caps that will fit your head shape and size preference:
Snapback
Plastic snap closures offer multiple adjustment points, typically fitting heads from 54-60cm. They're durable and provide a secure fit, though some people find the plastic uncomfortable against their head.
Strapback
Fabric or leather straps with a metal buckle or slide offer more precise adjustment than snapbacks. They generally have a lower profile at the back and are comfortable for extended wear. Common materials include cotton webbing, nylon, and leather.
Velcro/Hook-and-Loop
Velcro closures allow for the most precise adjustment but can wear out over time and may catch on hair. They're common on performance and athletic caps.
Stretch Fit
Caps with elastic bands in the sweatband area stretch to accommodate different head sizes within a range. Brands like Flexfit popularised this style. They offer a clean look without visible closures but have limited size range per cap.
Head Shape Considerations
Beyond circumference, your head shape affects which caps fit well. Not all heads are perfectly round, and cap construction varies accordingly.
Crown Height
The crown is the part of the cap that covers the top of your head. Caps come with low, mid, and high crown profiles. If you have a taller head shape, low-profile caps may feel too tight at the top even if the circumference is correct. Conversely, if your head is flatter on top, high-profile caps might look oversized.
Crown Structure
Structured caps have a stiff front panel that maintains its shape, while unstructured caps are soft and conform to your head. Those with rounder head shapes often find unstructured caps more comfortable, while structured caps can work better for those who want a more defined look.
Don't assume your fitted size in one brand translates directly to another. New Era, Mitchell & Ness, and other brands can vary by up to half a size. Always check specific brand sizing charts when possible, especially for premium fitted caps.
Trying On Caps: What to Check
When you receive a new cap or try one on in-store, assess these factors:
- Pressure points: The cap shouldn't create uncomfortable pressure anywhere on your head
- Stability: It should stay in place when you move your head normally
- Brim position: You should be able to wear the brim at your preferred angle without the cap riding up
- Ear clearance: The cap shouldn't press down on your ears
- Sweatband comfort: The inner band should feel comfortable against your forehead
Breaking In a New Cap
New caps, especially fitted styles, often need a short break-in period. The sweatband and crown will soften and conform to your head shape after several wears. If a cap is slightly snug initially but not uncomfortable, give it a week of regular wear before deciding it doesn't fit.
However, if a cap causes headaches, leaves red marks on your forehead, or feels painful, it's genuinely too small and won't stretch enough to become comfortable.
With accurate measurements and an understanding of sizing systems, you're now equipped to find caps that fit perfectly—whether shopping online or in-store. Remember that sizing can vary between brands and styles, so always check specific size charts when available.