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MM to Inches Fraction Chart12mm, 32mm & Printable 1/64" Reference
Convert millimeters to decimal inches and the nearest tape-measure fraction. For quick answers: 12mm = 0.4724" ≈ 15/32", and 32mm = 1.2598" ≈ 1 17/64". Use the chart when you need a printable reference for woodworking, hardware sizing, machining, or checking metric plans against inch tools.
Accurate - 25.4mm = 1"
Fractions - nearest 1/64"
Printable - Free PDF
⚡
Quick Converter Tool
Millimeters to inches in real-time, plus a reverse checker.
Example: 25.4 (Exactly 1 inch)
1.0000"
Approx: 1.0000" (1/1")
Quick references:
=
0.00 mm
Exact Formula
inches = mm ÷ 25.4
1 inch is defined as exactly 25.4 millimeters.
2.4mm
= 0.0945"
~ 3/32"
6mm
= 0.2362"
~ 1/4" (Close)
10mm
= 0.3937"
~ 25/64"
12mm
= 0.4724"
~ nearest 15/32"
25.4mm
= 1.0000"
~ 1 Inch
32mm
= 1.2598"
~ nearest 1 17/64"
Exact MM vs Fractional Inch: What Changes?
Millimeters convert to exact decimal inches by dividing by 25.4, but most rulers, tape measures, drill bits, and hardware labels use fractional inch sizes. That means a value like 12mm has an exact decimal result (0.4724") and a practical nearest fraction (15/32"). For parts labeled with nominal sizes, always check the actual measured diameter or thickness before choosing a fraction.
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Woodworking Bench • 1-100
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MM to Inches Conversion Chart
Range: 1-100mm • Precision: 3 decimal places • Fractions: 1/32"
| Millimeters (mm) | Inches (Decimal) | Inches (Fraction) |
|---|---|---|
| 1 | 0.039 | 1/32 |
| 2 | 0.079 | 3/32 |
| 3 | 0.118 | 1/8 |
| 4 | 0.157 | 5/32 |
| 5 | 0.197 | 3/16 |
| 6 | 0.236 | 1/4 |
| 7 | 0.276 | 9/32 |
| 8 | 0.315 | 5/16 |
| 9 | 0.354 | 11/32 |
| 10 | 0.394 | 13/32 |
| 11 | 0.433 | 7/16 |
| 12 | 0.472 | 15/32 |
| 13 | 0.512 | 1/2 |
| 14 | 0.551 | 9/16 |
| 15 | 0.591 | 19/32 |
| 16 | 0.630 | 5/8 |
| 17 | 0.669 | 21/32 |
| 18 | 0.709 | 23/32 |
| 19 | 0.748 | 3/4 |
| 20 | 0.787 | 25/32 |
| 21 | 0.827 | 13/16 |
| 22 | 0.866 | 7/8 |
| 23 | 0.906 | 29/32 |
| 24 | 0.945 | 15/16 |
| 25 | 0.984 | 31/32 |
| 26 | 1.024 | 1 1/32 |
| 27 | 1.063 | 1 1/16 |
| 28 | 1.102 | 1 3/32 |
| 29 | 1.142 | 1 5/32 |
| 30 | 1.181 | 1 3/16 |
| 31 | 1.220 | 1 7/32 |
| 32 | 1.260 | 1 1/4 |
| 33 | 1.299 | 1 5/16 |
| 34 | 1.339 | 1 11/32 |
| 35 | 1.378 | 1 3/8 |
| 36 | 1.417 | 1 13/32 |
| 37 | 1.457 | 1 15/32 |
| 38 | 1.496 | 1 1/2 |
| 39 | 1.535 | 1 17/32 |
| 40 | 1.575 | 1 9/16 |
| 41 | 1.614 | 1 5/8 |
| 42 | 1.654 | 1 21/32 |
| 43 | 1.693 | 1 11/16 |
| 44 | 1.732 | 1 23/32 |
| 45 | 1.772 | 1 25/32 |
| 46 | 1.811 | 1 13/16 |
| 47 | 1.850 | 1 27/32 |
| 48 | 1.890 | 1 7/8 |
| 49 | 1.929 | 1 15/16 |
| 50 | 1.969 | 1 31/32 |
| 51 | 2.008 | 2 |
| 52 | 2.047 | 2 1/16 |
| 53 | 2.087 | 2 3/32 |
| 54 | 2.126 | 2 1/8 |
| 55 | 2.165 | 2 5/32 |
| 56 | 2.205 | 2 7/32 |
| 57 | 2.244 | 2 1/4 |
| 58 | 2.283 | 2 9/32 |
| 59 | 2.323 | 2 5/16 |
| 60 | 2.362 | 2 3/8 |
| 61 | 2.402 | 2 13/32 |
| 62 | 2.441 | 2 7/16 |
| 63 | 2.480 | 2 15/32 |
| 64 | 2.520 | 2 17/32 |
| 65 | 2.559 | 2 9/16 |
| 66 | 2.598 | 2 19/32 |
| 67 | 2.638 | 2 5/8 |
| 68 | 2.677 | 2 11/16 |
| 69 | 2.717 | 2 23/32 |
| 70 | 2.756 | 2 3/4 |
| 71 | 2.795 | 2 25/32 |
| 72 | 2.835 | 2 27/32 |
| 73 | 2.874 | 2 7/8 |
| 74 | 2.913 | 2 29/32 |
| 75 | 2.953 | 2 15/16 |
| 76 | 2.992 | 2 1/1 |
| 77 | 3.031 | 3 1/32 |
| 78 | 3.071 | 3 1/16 |
| 79 | 3.110 | 3 1/8 |
| 80 | 3.150 | 3 5/32 |
| 81 | 3.189 | 3 3/16 |
| 82 | 3.228 | 3 7/32 |
| 83 | 3.268 | 3 9/32 |
| 84 | 3.307 | 3 5/16 |
| 85 | 3.346 | 3 11/32 |
| 86 | 3.386 | 3 3/8 |
| 87 | 3.425 | 3 7/16 |
| 88 | 3.465 | 3 15/32 |
| 89 | 3.504 | 3 1/2 |
| 90 | 3.543 | 3 17/32 |
| 91 | 3.583 | 3 19/32 |
| 92 | 3.622 | 3 5/8 |
| 93 | 3.661 | 3 21/32 |
| 94 | 3.701 | 3 11/16 |
| 95 | 3.740 | 3 3/4 |
| 96 | 3.780 | 3 25/32 |
| 97 | 3.819 | 3 13/16 |
| 98 | 3.858 | 3 27/32 |
| 99 | 3.898 | 3 29/32 |
| 100 | 3.937 | 3 15/16 |
Formula: inches = mm ÷ 25.4
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File Details
Rows
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Range
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PDF FILE SIZE
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Quality
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Printable MM to Inches Chart Preview
Preview the printable mm to inches chart before downloading. See exactly how the conversion table and workshop-ready layout will look when printed.
The "Tape Measure" Challenge: Decimals to Fractions
Converted 10mm to 0.3937" but can't find it on your ruler? Here is how to bridge the gap.
Reading the Increments
Most US tape measures use 1/16" increments. For precision conversions, you need to find the nearest fraction:
- 0.0625" 1/16"
- 0.1250" 1/8"
- 0.2500" 1/4"
- 0.3750" 3/8" (Close to 10mm!)
- 0.5000" 1/2"
Pro Tip: The 10mm Hack
If you are working in a shop and need a quick match for 10mm, it is almost exactly 25/64". However, most people use 3/8" as a "close enough" substitute for non-critical work, though it is slightly smaller than 10mm.
Fastener Cross-Reference (Metric to SAE)
Trying to match a metric bolt to an imperial wrench? Use these common equivalents.
Common Bolt Substitutes
6mm→1/4" (slightly larger)Loose
8mm→5/16" (almost exact)Perfect
10mm→3/8" (slightly smaller)Tight
13mm→1/2" (almost exact)Excellent
19mm→3/4" (almost exact)Perfect
Engineering Warning
Never use an SAE wrench on a Metric bolt for high-torque applications (like engine work). The small difference (even 0.1mm) can cause the wrench to slip and round off the bolt head permanently.
Metric Dowel & Inch Bit Matching
| Dowel | Closest Bit | Fit |
|---|---|---|
| 5mm | 3/16" (4.76mm) | Too Tight |
| 6mm | 15/64" (5.95mm) | Snug/Perfect |
| 8mm | 5/16" (7.94mm) | Snug/Perfect |
| 10mm | 25/64" (9.92mm) | Very Snug |
How to Use This Chart Effectively
Master millimeter to inches conversions with our comprehensive workshop guide.
Reading Decimals
Charts display up to 4 decimal places. For general fabrication, 3 places (0.XXX) is the industry standard.
Finding Fractions
Fractions are rounded to the nearest 1/64". Use these for marking workpieces with standard tape measures.
Printing for the Shop
Always print at 100% scale. We recommend laminating these charts to protect them from workshop grime.
Precision vs. Tolerance
🏠 Carpentry (±1/8")
Standard for framing and decks. Conversions can be rounded to the nearest 1/16".
🪑 Cabinetry (±1/64")
Furniture grade. Requires exact decimal-to-fraction matching for snug joinery.
Professional Applications
⚙️
Engineering
Critical for tolerance stack-ups where metric and imperial parts must interface.
🔧
Automotive
Match metric bolt heads to SAE sockets when the exact tool is missing.
The Math: How to Convert MM to Inches
Core Formula
Inches = MM ÷ 25.4
Established in 1959, the international inch is exactly 25.4mm. For precision, always divide by 25.4.
Related Inch Fraction Charts
Need to go the other direction or clean up a decimal result? These printable charts help you convert inch fractions, decimals, and millimeters without guessing.
Decimal → InchesMachining
| Decimal | Fraction | MM |
|---|---|---|
| 0.0156 | 1/64" | 0.40 |
| 0.0313 | 1/32" | 0.79 |
| 0.0625 | 1/16" | 1.59 |
| 0.1250 | 1/8" | 3.18 |
| 0.1875 | 3/16" | 4.76 |
| 0.2500 | 1/4" | 6.35 |
| 0.3125 | 5/16" | 7.94 |
| 0.3750 | 3/8" | 9.53 |
| 0.5000 | 1/2" | 12.70 |
| 0.6250 | 5/8" | 15.88 |
Decimal to Fraction (Inches)
Convert inch decimals to common fractions for measuring, woodworking, and machining.
Customize & DownloadInches → DecimalMachining
| Fraction | Decimal | MM |
|---|---|---|
| 1/64" | 0.0156 | 0.40 |
| 1/32" | 0.0313 | 0.79 |
| 1/16" | 0.0625 | 1.59 |
| 1/8" | 0.1250 | 3.18 |
| 3/16" | 0.1875 | 4.76 |
| 1/4" | 0.2500 | 6.35 |
| 5/16" | 0.3125 | 7.94 |
| 3/8" | 0.3750 | 9.53 |
| 1/2" | 0.5000 | 12.70 |
| 5/8" | 0.6250 | 15.88 |
Fraction to Decimal (Inches)
Convert inch fractions to decimals for woodworking, hardware sizing, and measuring.
Customize & DownloadInches → MMWorkshop preset
| Inches (fraction) | Inches (decimal) | Millimeters | Centimeters |
|---|---|---|---|
| 1/4" | 0.250 | 6.35 | 0.64 |
| 1/2" | 0.500 | 12.70 | 1.27 |
| 1" | 1.000 | 25.40 | 2.54 |
| 1 1/2" | 1.500 | 38.10 | 3.81 |
| 2" | 2.000 | 50.80 | 5.08 |
| 2 1/2" | 2.500 | 63.50 | 6.35 |
| 3" | 3.000 | 76.20 | 7.62 |
| 4" | 4.000 | 101.60 | 10.16 |
| 5" | 5.000 | 127.00 | 12.70 |
| 6" | 6.000 | 152.40 | 15.24 |
CM → InchesSizing helper
| Centimeters | Meters | Decimal (in) | Fraction (in) | ft'-in |
|---|---|---|---|---|
| 5 | 0.05 | 1.97 | 1 15/16" | 0'2" |
| 10 | 0.10 | 3.94 | 3 15/16" | 0'4" |
| 20 | 0.20 | 7.87 | 7 7/8" | 0'8" |
| 30 | 0.30 | 11.81 | 11 13/16" | 1'0" |
| 50 | 0.50 | 19.69 | 19 11/16" | 1'8" |
| 70 | 0.70 | 27.56 | 27 9/16" | 2'4" |
| 90 | 0.90 | 35.43 | 35 7/16" | 2'11" |
| 100 | 1.00 | 39.37 | 39 3/8" | 3'3" |
| 130 | 1.30 | 51.18 | 51 3/16" | 4'3" |
| 180 | 1.80 | 70.87 | 70 7/8" | 5'11" |
CM to Inches Chart
Convert centimeters to inches with precision for international sizing and measurements.
Customize & DownloadFrequently Asked Questions
What is mm to inches as a fraction?
To convert mm to inches as a fraction, first divide the millimeter value by 25.4 to get decimal inches, then round that decimal to the nearest common fraction such as 1/16", 1/32", or 1/64". This chart uses nearest 1/64" fractions for workshop and tape-measure reference.
What is 12mm to inches as a fraction?
12mm equals 0.4724 inches. Rounded to the nearest 1/64", 12mm is about 15/32". It is slightly under 1/2", so check the actual part size before substituting a 1/2" tool or hole.
What is 32mm to inches as a fraction?
32mm equals 1.2598 inches. Rounded to the nearest 1/64", 32mm is about 1 17/64". For exact work, use the decimal value; for layout or tape-measure marking, the nearest fraction is usually easier to read.
Should I use decimal inches or fractional inches for mm conversions?
Use decimal inches for machining, CAD, engineering drawings, and tolerance checks. Use fractional inches for tape measures, shop layout, woodworking marks, and quick hardware comparisons. If fit matters, confirm the actual measured size instead of relying only on the nearest fraction.
How do I convert mm to inches?
Divide millimeters by 25.4. For example, 12 ÷ 25.4 = 0.4724 inches. To show it as a fraction, round the decimal result to the nearest fraction increment, such as 1/64".
What is 15.87 mm to inches?
15.87mm is approximately 0.6248 inches, which is almost exactly 5/8 inch (0.625"). This is a critical conversion for matching metric machinery to imperial tooling.
What is 2.4 mm to inches?
2.4mm is approximately 0.0945 inches. In fractional inches, this is very close to 3/32" (0.0938").
Can I use an 8mm dowel in a 5/16 inch hole?
Yes. 5/16" is 7.94mm, which provides a very snug, almost perfect fit for an 8mm dowel. Confirm the actual dowel diameter if the joint fit is critical.