mm to inches chart
Read the decimal and rounded fractional equivalents of each millimeter value in the table. Select a range and use Print / Save as PDF for a workshop reference.
Maintained by mmtoinches.im · Updated
NIST describes the standard inch as exactly equivalent to 25.4 mm
. NIST length definition. Method and limitations.
Comprehensive millimeter to inch conversion chart with both decimal and fractional inch equivalents. Quickly toggle display presets for 1–50, 51–100, 1–100, or 1–500 mm to focus on the range you need. This printable reference table provides instant lookup for common metric-to-imperial conversions without calculation, ideal for workshop walls, toolboxes, or quick reference during manufacturing, woodworking, and construction projects.
Comprehensive millimeter to inch conversion chart with both decimal and fractional inch equivalents. Quickly toggle display presets for 1–50, 51–100, 1–100, or 1–500 mm to focus on the range you need. This printable reference table provides instant lookup for common metric-to-imperial conversions without calculation, ideal for workshop walls, toolboxes, or quick reference during manufacturing, woodworking, and construction projects.
Print this chart as a PDF or keep it on-screen for rapid measurement translation. Set custom Start and End values in Print Settings to generate a PDF for any range (e.g., 120–380 mm), with precise decimal inches (to 4 places) and the nearest 1/32" fractional approximation. Larger spans are supported via custom ranges, letting you export well beyond 500 mm when needed.
Print this chart as a PDF or keep it on-screen for rapid measurement translation. Set custom Start and End values in Print Settings to generate a PDF for any range (e.g., 120–380 mm), with precise decimal inches (to 4 places) and the nearest 1/32" fractional approximation. Larger spans are supported via custom ranges, letting you export well beyond 500 mm when needed.
Most Searched Values
💡 Tip: The table will automatically scroll to your value and switch ranges if needed
Display Range
Fraction Display
Print Settings
Supported range: 1-5000 mm
Tip for clean PDF export:
In the print dialog, uncheck "Headers and footers" option to remove browser-generated page information (URL, date, page numbers) from your PDF.
mm to inches chart: quick lookup table
| mm | Decimal | |
|---|---|---|
| 1 | 0.0394" | |
| 2 | 0.0787" | |
| 3 | 0.1181" | |
| 4 | 0.1575" | |
| 5 | 0.1969" | |
| 6 | 0.2362" | |
| 7 | 0.2756" | |
| 8 | 0.315" | |
| 9 | 0.3543" | |
| 10 | 0.3937" | |
| 11 | 0.4331" | |
| 12 | 0.4724" | |
| 13 | 0.5118" | |
| 14 | 0.5512" | |
| 15 | 0.5906" | |
| 16 | 0.6299" | |
| 17 | 0.6693" | |
| 18 | 0.7087" | |
| 19 | 0.748" | |
| 20 | 0.7874" | |
| 21 | 0.8268" | |
| 22 | 0.8661" | |
| 23 | 0.9055" | |
| 24 | 0.9449" | |
| 25 | 0.9843" | |
| 26 | 1.0236" | |
| 27 | 1.063" | |
| 28 | 1.1024" | |
| 29 | 1.1417" | |
| 30 | 1.1811" | |
| 31 | 1.2205" | |
| 32 | 1.2598" | |
| 33 | 1.2992" | |
| 34 | 1.3386" | |
| 35 | 1.378" | |
| 36 | 1.4173" | |
| 37 | 1.4567" | |
| 38 | 1.4961" | |
| 39 | 1.5354" | |
| 40 | 1.5748" | |
| 41 | 1.6142" | |
| 42 | 1.6535" | |
| 43 | 1.6929" | |
| 44 | 1.7323" | |
| 45 | 1.7717" | |
| 46 | 1.811" | |
| 47 | 1.8504" | |
| 48 | 1.8898" | |
| 49 | 1.9291" | |
| 50 | 1.9685" |
Detailed Conversion Table
Includes decimal inches and nearest 1/32" fraction with all values from 1-100mm.
| mm | Decimal Inches | Fraction (1/32) | Actions |
|---|---|---|---|
| 1 | 0.0394" | 1/32" | |
| 2 | 0.0787" | 3/32" | |
| 3 | 0.1181" | 1/8" | |
| 4 | 0.1575" | 5/32" | |
| 5 | 0.1969" | 3/16" | |
| 6 | 0.2362" | 1/4" | |
| 7 | 0.2756" | 9/32" | |
| 8 | 0.315" | 5/16" | |
| 9 | 0.3543" | 11/32" | |
| 10 | 0.3937" | 13/32" | |
| 11 | 0.4331" | 7/16" | |
| 12 | 0.4724" | 15/32" | |
| 13 | 0.5118" | 1/2" | |
| 14 | 0.5512" | 9/16" | |
| 15 | 0.5906" | 19/32" | |
| 16 | 0.6299" | 5/8" | |
| 17 | 0.6693" | 21/32" | |
| 18 | 0.7087" | 23/32" | |
| 19 | 0.748" | 3/4" | |
| 20 | 0.7874" | 25/32" | |
| 21 | 0.8268" | 13/16" | |
| 22 | 0.8661" | 7/8" | |
| 23 | 0.9055" | 29/32" | |
| 24 | 0.9449" | 15/16" | |
| 25 | 0.9843" | 31/32" | |
| 26 | 1.0236" | 1 1/32" | |
| 27 | 1.063" | 1 1/16" | |
| 28 | 1.1024" | 1 3/32" | |
| 29 | 1.1417" | 1 5/32" | |
| 30 | 1.1811" | 1 3/16" | |
| 31 | 1.2205" | 1 7/32" | |
| 32 | 1.2598" | 1 1/4" | |
| 33 | 1.2992" | 1 5/16" | |
| 34 | 1.3386" | 1 11/32" | |
| 35 | 1.378" | 1 3/8" | |
| 36 | 1.4173" | 1 13/32" | |
| 37 | 1.4567" | 1 15/32" | |
| 38 | 1.4961" | 1 1/2" | |
| 39 | 1.5354" | 1 17/32" | |
| 40 | 1.5748" | 1 9/16" | |
| 41 | 1.6142" | 1 5/8" | |
| 42 | 1.6535" | 1 21/32" | |
| 43 | 1.6929" | 1 11/16" | |
| 44 | 1.7323" | 1 23/32" | |
| 45 | 1.7717" | 1 25/32" | |
| 46 | 1.811" | 1 13/16" | |
| 47 | 1.8504" | 1 27/32" | |
| 48 | 1.8898" | 1 7/8" | |
| 49 | 1.9291" | 1 15/16" | |
| 50 | 1.9685" | 1 31/32" |
Common Use Cases
Hardware & Tools
Paper Sizes
Automotive
Real-World Size Reference
| Millimeters | Inches | Real Object | Common Use |
|---|---|---|---|
| 1mm | 0.04" | Credit card thickness | Thin sheet metal, shims |
| 5mm | 0.20" | Pencil diameter | Small screws, drill bits |
| 10mm | 0.39" | Finger width | Bolts, pipe fittings |
| 25mm | 0.98" | US quarter diameter | Lumber thickness, pipes |
| 50mm | 1.97" | Golf ball diameter | Building materials, plates |
| 100mm | 3.94" | Smartphone width | Structural components |
💡 Pro Tip
Click any mm value in the table to jump to its precise conversion in the detailed table above, or use the quick search to find any specific measurement instantly.
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About this mm to inches chart
This comprehensive conversion chart provides instant reference values for transforming millimeters to inches across the range of 1mm to 100mm. All conversions utilize the precise international standard conversion factor: 1 inch = 25.4 millimeters exactly, established by international agreement and used worldwide for metric-imperial measurement translation.
Decimal inch values are calculated to 4 decimal places for engineering precision and quality control applications. Fractional inch approximations display the nearest 1/32" equivalent, the most common precision level for general mechanical work, carpentry, and metal fabrication. This dual-format presentation serves both precision machining (requiring decimal accuracy) and traditional crafts (using fractional rulers and tape measures).
Printing instructions: Click the "Print / Save as PDF" button above to generate a printer-optimized version of this conversion table. The print layout is formatted for standard letter-size (8.5" × 11") paper in portrait orientation, with unnecessary interface elements hidden for maximum chart legibility. Save the PDF to your device or print multiple copies for workshop distribution.
Common applications: This millimeter-inch chart proves invaluable when working with imported hardware (metric fasteners, bearings, tubing), reading international technical drawings, converting European product specifications, sizing drill bits between metric and fractional inch sets, or verifying CNC machining dimensions across measurement systems. Keep a printed copy at your workbench, machine shop, or construction site for instant reference without digital devices.
Frequently Asked Questions
Yes. Use the "Print / Save as PDF" button above the chart. In the print dialog choose "Save as PDF" and disable browser headers and footers for a clean document. You can customize the range by setting Start and End values in Print Settings to generate a PDF for any range up to 5000mm.
Each millimeter value displays decimal inches rounded to four places plus the nearest fractional approximation (1/16", 1/32", or 1/64" based on your selection), for reference. Compare rounding error with the specified tolerance; display precision does not establish manufacturing accuracy.
Use the core converter or batch converter (linked at the bottom of the page) for any larger measurement or paste multiple entries to export a custom chart. On this page, you can also select the "1–500 mm" display range to view values beyond 100 mm, and set a custom Start/End (mm) in Print Settings to generate a PDF for any range (e.g., 120–380 mm).
Use the quick search box above the table to enter any mm value. The table will automatically scroll to and highlight that row, switching display ranges if needed. You can also click on the popular values shortcuts to jump directly to commonly referenced measurements like 10mm, 25mm, or 100mm.
Yes! Click the "Details" link next to any value in the detailed table to navigate to its dedicated conversion page with a unique URL that you can bookmark or share. Each page includes the exact conversion expression and rounded results in multiple formats with comprehensive explanations and practical applications.
1-20mm values are typical for small hardware like screws, bolts, and drill bits. 20-100mm covers standard paper sizes, pipe diameters, and woodworking materials. 100-500mm is useful for construction dimensions, tire widths, and building materials. See the "Common Use Cases" section above for detailed examples in hardware, automotive, paper sizes, and construction applications.
Your preferences including fraction display, denominator precision (1/16", 1/32", or 1/64"), and display range selection are automatically saved in your browser and will be remembered on your next visit. This ensures a consistent experience without needing to reconfigure settings each time.
Absolutely. This conversion chart uses the exact international standard (1 inch = 25.4mm) and provides 4-decimal display precision for comparing dimensions. The fractional approximations are ideal for workshop applications, carpentry, and metal fabrication. Check each rounded result against the requirements of your task before using it.
Yes, the chart is fully responsive and optimized for mobile, tablet, and desktop devices. On mobile, you get a streamlined single-column view with quick copy buttons. The search functionality works seamlessly across all devices, making it easy to find specific values even on smaller screens.
The fractional conversions show the nearest approximation to the specified precision level (1/16", 1/32", or 1/64"). While not exact in all cases, their rounding error must be checked against your specified tolerance. The decimal column is also rounded to four places; the exact expression is mm divided by 25.4.
Related Conversions
Sources and calculation notes
Read the decimal and rounded fractional equivalents of each millimeter value in the table. Select a range and use Print / Save as PDF for a workshop reference.
Method: Divide millimeters by 25.4 to obtain inches. The factor is exact; displayed decimal values are rounded. Fractional inches are rounded to the selected denominator.
Scope: A unit conversion does not establish a manufacturing tolerance or guarantee that similarly sized parts fit. Keep the original measurement and its uncertainty.
Content maintained by mmtoinches.im. Updated and reference notes reviewed . How we calculate and present measurements. Sources support the stated definitions; examples and calculators are not certification of a product or compliance with a standard.