Converting Your Metric Wrench to Imperial Measurement Units

Many DIY enthusiasts have separate metric and imperial wrench set. However, if you don’t own separate wrenches or simply don’t want to spend more money, we have a solution. Whether you feel somewhat confused with imperial measurements or you just found a part that doesn’t fit with any of your metric wrenches, there’s absolutely no need to run to the shop for another tool. We’ll use some simple mathematics to convert the metric measurement values to the imperial and vice versa. As soon as you’re done, you’ll be able to start working immediately.


The world still can’t convert to one measurement standard entirely. Until then, we’ll have to use both standards. We’ve come up with a formula that you will need to determine the imperial size from its metric equivalent. To convert centimeters to inches, multiply them by 0.3926. Plus, to convert meters to feet, multiply the meters by 3.3333.


No need to find a calculator of your own. We’ve made a mm-to-inch chart compatible with most wrenches. Convert everything with ease!

  • 1 mm – n/a;
  • 2 mm – n/a;
  • 3 mm – 1/8 inches;
  • 4 mm – 5/32 inches;
  • 5 mm – 3/16 inches;
  • 6 mm – 1/4 inches;
  • 7 mm – 9/32 inches;
  • 8 mm – 5/16 inches;
  • 9 mm – 11/32 inches;
  • 10 mm – 13/32 inches;
  • 11 mm – 7/16 inches;
  • 12 mm – 15/32 inches;
  • 13 mm – 1/2 inches;
  • 14 mm – 9/16 inches;
  • 15 mm – 19/32 inches;
  • 16 mm – 5/8 inches;
  • 17 mm – 21/32 (11/16) inches;
  • 18 mm – 23/32 inches;
  • 19 mm – 3/4 inches;
  • 20 mm – 25/32 inches;
  • 21 mm – 27/32 inches;
  • 22 mm – 7/8 inches;
  • 23 mm – 29/32 inches;
  • 24 mm – 15/16 inches;
  • 25 mm – 1 inch.

You can easily interchange both parts. So, whether you need to convert imperial units to their metric counterparts or vice versa, you’ll find this chart very useful. As one and two millimeter have no imperial counterparts, we had to put a “N/A” next to them.

Areas of Application

As you understand, you’ll have to use the conversion chart or the actual formula when you’ll face the need to convert metric units into imperial or vice versa. One particular area of application is if you’re working with American cars. They primarily use imperial measurement standards, and if you only have metric wrenches, you’ll quickly find yourself confused over which wrench to use. The same applies to other appliances made in USA, especially if they use small motors.

If you frequently work with anything that uses imperial measurement standards, it will be a good idea to copy the formula and chart so that you won’t need to open this article every now and then. Place it in your toolbox or other location you frequently use. This will save you a lot of time and nerves in the long run.

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