Use this mm to inches calculator to accurately convert millimeters to inches.
Get instant results in decimal, fractional, and feet+inches formats with adjustable precision for every mm to inches task.
Get instant results in decimal, fractional, and feet+inches formats with adjustable precision for every mm to inches task.
Use this mm to inches calculator to accurately convert millimeters to inches. Get instant results in decimal, fractional, and feet+inches formats with adjustable precision for every mm to inches task.
Practical converters for real jobs—drill bits, screws, paper sizes, sheet metal, threads, tolerances, luggage, mattresses, and bike tires—paired with fractional guidance and reference charts to keep teams aligned across metric and imperial specs.
Practical converters for real jobs—drill bits, screws, paper sizes, sheet metal, threads, tolerances, luggage, mattresses, and bike tires—paired with fractional guidance and reference charts to keep teams aligned across metric and imperial specs.
Convert metric drill bits to decimal and fractional inches, browse common sizes, and pick the right denominator for woodworking or fabrication.
Convert metric drill bits to decimal and fractional inches, browse common sizes, and pick the right denominator for woodworking or fabrication.
Map gauge screws and metric M sizes to mm and inches, with length rounding examples for practical fit decisions.
Map gauge screws and metric M sizes to mm and inches, with length rounding examples for practical fit decisions.
Convert A0–A6 paper to inches and compare with US Letter, Legal, and Tabloid with clear rounding notes for printing.
Convert A0–A6 paper to inches and compare with US Letter, Legal, and Tabloid with clear rounding notes for printing.
Convert luggage dimensions, explore carry on luggage size references, and see linear totals with approximate volume notes.
Convert luggage dimensions, explore carry on luggage size references, and see linear totals with approximate volume notes.
See US mattress dimensions from Twin to California King in inches and millimeters, with fit and thickness notes.
See US mattress dimensions from Twin to California King in inches and millimeters, with fit and thickness notes.
Convert 700c (622 mm BSD) to inches, estimate overall diameter by tire width, and compare to 29er, 27.5, and 26.
Convert 700c (622 mm BSD) to inches, estimate overall diameter by tire width, and compare to 29er, 27.5, and 26.
Material-specific gauge charts for steel, galvanized steel, and aluminum with mm and inch thickness and fabrication notes.
Material-specific gauge charts for steel, galvanized steel, and aluminum with mm and inch thickness and fabrication notes.
Convert diameter and pitch between metric and UNC/UNF, see TPI vs mm pitch, and avoid cross-threading with clear warnings.
Convert diameter and pitch between metric and UNC/UNF, see TPI vs mm pitch, and avoid cross-threading with clear warnings.
Convert tolerances, compute limits and clearances, and classify fits as clearance, transition, or interference.
Convert tolerances, compute limits and clearances, and classify fits as clearance, transition, or interference.
Convert American Wire Gauge sizes to millimeters and inches with quick references for common gauges.
Convert American Wire Gauge sizes to millimeters and inches with quick references for common gauges.
Browse all mm to inches guides by category—fabrication, travel, home, cycling, electronics, and more.
Browse all mm to inches guides by category—fabrication, travel, home, cycling, electronics, and more.
Quick lookup table with fractional and feet+inches display, linking to detailed value pages.
Quick lookup table with fractional and feet+inches display, linking to detailed value pages.
Go deeper on standards, tolerances, and communication. These guides help teams avoid conversion mistakes, mismatched hardware, and rework when mixing metric and imperial systems.
Go deeper on standards, tolerances, and communication.
Choose the right denominator (1/16, 1/32, 1/64), manage rounding bias, and pair fractions with decimal inches for transparent tolerances.
Choose the right denominator (1/16, 1/32, 1/64), manage rounding bias, and pair fractions with decimal inches for transparent tolerances.
Spot nominal size traps, avoid double rounding, and document tolerances when mixing millimeters and inches across standards.
Spot nominal size traps, avoid double rounding, and document tolerances when mixing millimeters and inches across standards.
Understand AWG, BWG, and sheet metal gauges, why numbers are inverted, and how to cite exact thickness in mm and inches.
Understand AWG, BWG, and sheet metal gauges, why numbers are inverted, and how to cite exact thickness in mm and inches.
Compare metric pitch and imperial TPI, fit classes, and common near-matches so you can specify fasteners without cross-threading.
Compare metric pitch and imperial TPI, fit classes, and common near-matches so you can specify fasteners without cross-threading.
inches = millimeters ÷ 25.4
The conversion factor is based on the international standard: 1 inch = 25.4 millimeters. This calculator uses this exact ratio for all conversions.
Quick values:
Enter a millimeter value to see conversions
Results will appear in decimal, fraction, and feet+inches formats