42 mm to Inches
Convert 42 millimeters to inches — instant, accurate, and easy
The Answer
How to Convert 42 mm to Inches
To convert 42 millimeters to inches, divide the millimeter value by 25.4. This is because one inch equals exactly 25.4 millimeters — a standard defined by international agreement.
The Calculation
Applying the formula to 42 mm:
Result Summary for 42 mm
- Decimal inches: 1.6535″
- Fractional inches: 1 21/32″ (nearest 1/64)
- Feet and inches: 0 ft 1.65 in
Common Uses for 42mm Measurements
The 42mm measurement is commonly seen in construction hardware, plumbing fittings, mechanical parts, and general purpose crafting or DIY projects.
Everyday examples of 42mm include pipe diameters, larger screws and bolts, small tool components, and standard hardware sizes.
Why Convert 42 mm to Inches?
Converting 42mm to inches is essential when working with hardware, tools, materials, or products from countries that use different measurement systems.
Knowing that 42 mm equals 1.6535 inches helps you make accurate measurements and avoid costly mistakes.
Reference Table — Values Near 42 mm
| Millimeters | Decimal Inches | Fractional Inches |
|---|---|---|
| 39 mm | 1.5354″ | 1 17/32″ |
| 40 mm | 1.5748″ | 1 37/64″ |
| 41 mm | 1.6142″ | 1 39/64″ |
| 42 mm | 1.6535″ | 1 21/32″ |
| 43 mm | 1.6929″ | 1 11/16″ |
| 44 mm | 1.7323″ | 1 47/64″ |
| 45 mm | 1.7717″ | 1 49/64″ |
42 mm in Other Units
Millimetres convert cleanly into every other length unit. Here is 42 mm expressed seven different ways — useful when a drawing, spec sheet or supplier quotes a unit other than inches.
| Unit | 42 mm equals |
|---|---|
| Centimetres (cm) | 4.2 cm |
| Metres (m) | 0.042 m |
| Inches (in) | 1.6535 in |
| Feet (ft) | 0.1378 ft |
| Yards (yd) | 0.04593 yd |
| Thousandths of an inch (mil) | 1,653.5 mil |
| Typographic points (1/72 in) | 119.06 pt |
How Accurate Is Each Fraction of 42 mm?
42 mm is exactly 1.6535″. Any fraction is a rounding of that number, so each one carries a small error. This table shows the closest fraction at each common denominator and how far it actually sits from 42 mm.
| Rounded to | Fraction | Decimal | Difference |
|---|---|---|---|
| Nearest 1/2″ | 1 1/2″ | 1.5000″ | −3.900 mm |
| Nearest 1/4″ | 1 3/4″ | 1.7500″ | +2.450 mm |
| Nearest 1/8″ | 1 5/8″ | 1.6250″ | −0.725 mm |
| Nearest 1/16″ | 1 5/8″ | 1.6250″ | −0.725 mm |
| Nearest 1/32″ | 1 21/32″ | 1.6563″ | +0.069 mm |
| Nearest 1/64″ | 1 21/32″ | 1.6563″ | +0.069 mm |
For woodworking, DIY and general workshop use, 1 21/32″ is the practical choice — it lands within 0.4 mm of 42 mm, which is finer than most tape measures resolve. For machining, toolmaking or CAD, use the decimal value 1.6535″ rather than any fraction.
FAQ About 42 mm to Inches
How many inches is 42 mm?
42 millimeters equals 1.6535 inches, or approximately 1 21/32″ (nearest 1/64 inch).
How accurate is the 42 mm to inches conversion?
The conversion of 42 mm to 1.6535 inches is mathematically precise, based on 1 inch = 25.4 millimeters exactly.
Can I convert 42 mm to feet?
Yes. 42 millimeters equals approximately 0 ft 1.65 in.