Strap size guide

You’ve found the perfect strap design and confirmed it’s compatible with your smartwatch. Now comes the most important question for your daily comfort: How will it fit my wrist?

Unlike shoe sizes or clothing, the smartwatch industry does not have one strict, universal sizing chart for strap lengths. Because watch cases vary in size, and different materials sit differently against the skin, strap lengths can vary slightly from brand to brand.

However, finding your perfect fit is easier than you think. This guide will walk you through how to measure your wrist in under a minute, and how to use industry benchmarks from brands like Apple and Samsung to understand what "Small," "Medium," and "Large" generally mean for our replacement straps.

Step 1: How to measure your wrist

Before comparing sizes, you need to know your own wrist circumference. You don't need any special tools for this—just common household items.

The Soft Tape Method (Most Accurate)

  1. Take a soft, flexible measuring tape (like a tailor's tape).
  2. Wrap it snugly around your wrist, positioned just below your wrist bone (where you would naturally wear your watch).
  3. Read the measurement in millimeters (mm) or centimeters (cm) where the tape overlaps.

The String and Ruler Method

  1. If you don't have a soft measuring tape, take a piece of string, a shoelace, or even a thin strip of paper.
  2. Wrap it around your wrist just below the wrist bone.
  3. Use a pen to mark the exact point where the string or paper overlaps.
  4. Lay the string flat on a table and measure the distance from the end to your mark using a standard ruler.

→ Pro Tip for Comfort: If you prefer a looser, more relaxed fit (common with metal link bracelets), add about 1 to 1.5 centimeters to your final measurement.

Step 2: Understanding industry size benchmarks

Because we source a massive variety of straps for different smartwatch models, you might notice that some of our products are listed as "One Size Fits Most," while others offer "S/M" or "M/L" options.

To help you visualize what these sizes mean, we can look at the sizing standards set by the industry's biggest smartwatch and fitness tracker brands:

The Apple benchmark

Apple generally divides their standard bands (like the Sport Band) into two main length categories. If you have ever owned an Apple Watch, you can use this as a reference point:

  • S/M (Small/Medium): Typically designed for wrists measuring between 130mm and 180mm.
  • M/L (Medium/Large): Typically designed for wrists measuring between 150mm and 210mm.

The Fitbit benchmark

Fitbit keeps things very streamlined, usually offering two distinct sizes in the box for their popular trackers like the Charge, Versa, and Sense. Their sizing is slightly different from Apple’s:

  • Small: Designed to fit wrists between 140mm and 180mm.
  • Large: Designed to fit wrists between 180mm and 220mm.

The Garmin benchmark

Because Garmin builds watches for extreme outdoor use, their standard silicone bands are notoriously long to allow them to be worn over wetsuits or winter jackets. However, their lifestyle watches often come in specific sizes:

  • Small/Medium: Usually designed for wrists measuring 125mm to 190mm.
  • Large / Standard (One Size): Garmin's standard "one size" bands (especially for the Fenix and Forerunner series) offer a massive adjustment range, typically fitting wrists anywhere from 135mm all the way up to 215mm or 230mm, depending on the model.

The traditional watch standard (Samsung & universal)

Brands like Samsung, along with traditional watchmakers utilizing the standard buckle system, usually don't use letter sizing. Instead, the industry groups wrist sizes into three general categories:

  • Small Wrists: Approximately 140mm to 165mm
  • Medium Wrists: Approximately 165mm to 190mm
  • Large Wrists: Approximately 190mm to 215mm

Note: If a strap on our site does not specify a size, it is generally designed to be highly adjustable, fitting the "Medium" to "Large" range (roughly 150mm to 205mm) to safely accommodate the vast majority of users.

Shop with confidence

At the end of the day, your smartwatch is something you wear from your morning commute to your evening workout, so finding a comfortable fit is essential.

By measuring your wrist and keeping these brand benchmarks in mind, you can confidently explore our massive catalog of replacement straps. And remember: if you are ever caught between sizes, or simply want the most forgiving fit possible, you can never go wrong with a fully adjustable nylon or magnetic loop strap!

→ Shop smartwatch straps by brand

→ Check out our compatibility guide