SAE to Metric Calculator & Metric to Standard
Convert a measurement from SAE to metric or metric to standard SAE using the calculator below. Learn more about SAE and metric measurements and refer to the conversion chart below.
Nearest Standard Measurement
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How to Convert SAE to Metric
SAE, or standard, and metric sockets, wrenches, and fasteners are both commonly used, and the difference between them is significant. Before we cover how to convert SAE to metric, it’s important to understand what these terms actually mean.
SAE stands for Society of Automotive Engineers, and is based on standard imperial and U.S. customary measurements. It’s based on measurements in inch fractions and is most commonly used in the United States.
Metric sizes are used worldwide, and sockets and screws are primarily measured in millimeters.
You can use the chart below to convert an SAE size to metric, but you can also do the conversion by hand in a few easy steps.
Step One: Convert the Fraction to Decimal
The first step is to convert the inch fraction to a decimal. You can do this by treating the fraction as a division problem and solving.
1/4″ = 1 ÷ 4 = 0.25″
Step Two: Convert to Millimeters
The next step is to multiply the inch decimal by 25.4 to convert it to millimeters. This is the key step for converting SAE to metric.
0.25″ × 25.4 = 6.35 mm
SAE to Metric Conversion Chart
The chart below shows SAE and equivalent metric and inch decimal measurements for common socket, wrench, and screw sizes.
|Standard (SAE)||Metric (mm)||Inches (decimal)|
More Standard to Metric Conversions
You can use our inches to mm conversion calculator to convert SAE measurements to metric or convert these common sizes.
- SAE International, https://www.sae.org/