Metric to SAE Converter – Calculate MM to Inches

Use our metric to sae calculator to convert measurements from the metric system to the SAE (Society of Automotive Engineers) system, also known as the imperial or standard system.

This calculator is particularly useful for engineers, mechanics, and DIY enthusiasts who frequently work with both measurement systems.

The metric system, used in most countries worldwide, is based on units of 10 and uses measurements like millimeters (mm), centimeters (cm), and meters (m). On the other hand, the SAE system, primarily used in the United States, relies on inches and fractions of inches.

The metric to sae conversion saves time and reduces errors that might occur during manual calculations.

Metric to SAE Conversion Formula

The fundamental formula for converting metric measurements to SAE is:

1 inch = 25.4 millimeters

Based on this, we can derive the following formula:

SAE (inches) = Metric (mm) ÷ 25.4

Here are some common conversions:

Length

• Millimeters to Inches: $$ \text{Inches} = \text{Millimeters} \times 0.0393701 $$
• Centimeters to Inches: $$ \text{Inches} = \text{Centimeters} \times 0.393701 $$
• Meters to Feet: $$ \text{Feet} = \text{Meters} \times 3.28084 $$
• Meters to Inches: $$ \text{Inches} = \text{Meters} \times 39.3701 $$

Weight

• Grams to Ounces: $$ \text{Ounces} = \text{Grams} \times 0.035274 $$
• Kilograms to Pounds: $$ \text{Pounds} = \text{Kilograms} \times 2.20462 $$

Volume

• Milliliters to Fluid Ounces: $$ \text{Fluid Ounces} = \text{Milliliters} \times 0.033814 $$
• Liters to Gallons: $$ \text{Gallons} = \text{Liters} \times 0.264172 $$

Temperature

• Celsius to Fahrenheit: $$ \text{Fahrenheit} = \left(\text{Celsius} \times \frac{9}{5}\right) + 32 $$

How do you convert metric to SAE?

Converting metric measurements to SAE involves the following steps:

1. Start with the metric measurement in millimeters (mm).
2. Divide the metric value by 25.4 to get the equivalent in inches.
3. Round the result to the nearest fraction of an inch commonly used in the SAE system.

For example, let’s convert 10 mm to SAE:

1. Start with 10 mm
2. 10 ÷ 25.4 = 0.3937 inches
3. Round to the nearest fraction: 0.3937 is closest to 3/8 inch (0.375)

10 mm is approximately 3/8 inch in the SAE system.

• 10 mm ≈ 0.394 inches
• 15 mm ≈ 0.591 inches
• 18 mm ≈ 0.709 inches
• 17 mm ≈ 0.669 inches
• 22 mm ≈ 0.866 inches

More Calculators:

• Grams to Tablespoons
• Ms To Kmh Converter
• Grams to Cups
• Quarters to Dollars
• Macros to Calories

Metric to SAE Conversion Chart

Metric (mm)	Calculation	Exact SAE (inches)	Rounded SAE (fraction)
5	5 ÷ 25.4	0.1968	3/16
8	8 ÷ 25.4	0.3149	5/16
12	12 ÷ 25.4	0.4724	15/32
20	20 ÷ 25.4	0.7874	25/32
25	25 ÷ 25.4	0.9842	1
30	30 ÷ 25.4	1.1811	1 3/16
40	40 ÷ 25.4	1.5748	1 19/32
50	50 ÷ 25.4	1.9685	2