MM to Inches Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles
Input Value
Enter a value and select units to convert
Quick Conversions
Common Conversions
1 inch
= 25.4 mm
1 foot
= 304.8 mm / 30.48 cm
1 yard
= 914.4 mm / 91.44 cm
1 meter
= 39.37 inches
1 mile
= 1.609 km
Conversion Result
25.4 mm =
1
Inch
All Conversions
25.4 mm equals:
Metric Units
Millimeter25.4 mm
Centimeter2.54 cm
Meter0.0254 m
Kilometer0.0000254 km
Imperial Units
Inch1 in
Foot0.083333 ft
Yard0.027778 yd
Mile0.00001578 mi
Real-World Examples
Click to convert common measurements
Credit Card Width85.6 mm
A4 Paper Width210 mm
A4 Paper Height297 mm
iPhone 15 Height147.6 mm
Standard Door Height80 in
Basketball Diameter9.43 in
Soccer Field Length100 m
Football Field Length100 yd
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About MM to Inches Converter
Understanding Length Conversions
This converter helps you convert between metric (millimeters, centimeters, meters, kilometers) and imperial (inches, feet, yards, miles) length units. The most common conversion is between millimeters and inches, where 1 inch equals exactly 25.4 millimeters.
Metric System (SI Units)
- Millimeter (mm): 1/1000 of a meter, used for small precise measurements
- Centimeter (cm): 1/100 of a meter, 10 millimeters
- Meter (m): Base unit of length in the metric system
- Kilometer (km): 1000 meters, used for long distances
Imperial System
- Inch (in): 1/12 of a foot, equals 25.4 mm exactly
- Foot (ft): 12 inches, equals 30.48 cm
- Yard (yd): 3 feet or 36 inches
- Mile (mi): 5,280 feet or 1,760 yards
Key Conversion Facts
- 1 inch = 25.4 millimeters (exact)
- 1 foot = 30.48 centimeters (exact)
- 1 meter ≈ 39.37 inches
- 1 mile ≈ 1.609 kilometers
- 1 yard = 0.9144 meters (exact)
Common Use Cases
- Converting product dimensions for international shipping
- Understanding screen sizes (TVs, monitors, phones)
- Construction and carpentry measurements
- Converting recipe measurements
- Understanding clothing and shoe sizes
- Engineering and technical drawings
- Travel distances and map reading
Quick Reference
Metric to Imperial:
10 mm ≈ 0.39 inches
1 cm ≈ 0.39 inches
1 m ≈ 3.28 feet
1 km ≈ 0.62 miles
Imperial to Metric:
1 inch = 2.54 cm
1 foot ≈ 30.48 cm
1 yard ≈ 91.44 cm
1 mile ≈ 1.61 km
Tips for Accurate Conversions
- Use exact conversion factors when precision is critical
- Round appropriately based on your measurement precision
- Remember that 1 inch = 25.4 mm is an exact definition
- For rough estimates: 1 meter ≈ 1 yard (actually 1.09 yards)
- Most countries use the metric system; the US primarily uses imperial
Why 25.4?
The conversion factor of 25.4 mm per inch comes from the international yard and pound agreement of 1959, which defined the inch as exactly 25.4 millimeters. This standardized the relationship between imperial and metric units worldwide.