Decimal to Fraction Chart(Inches & MM Conversion)

High-precision reference guide for machinists, woodworkers, and engineers. Convert decimals to common fractions with customizable precision up to 1/64".

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High PrecisionUp to 1/64"
Metric SupportMillimeters included
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Standard (Woodworking) 0" - 1"

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Decimal to Fraction Chart

Precision: 1/64" • Range 0" - 1"

Decimal (in)FractionMetric (mm)
0.00000"0.000
0.01561/64"0.397
0.03131/32"0.794
0.04693/64"1.191
0.06251/16"1.587
0.07815/64"1.984
0.09383/32"2.381
0.10947/64"2.778
0.12501/8"3.175
0.14069/64"3.572
0.15635/32"3.969
0.171911/64"4.366
0.18753/16"4.762
0.203113/64"5.159
0.21887/32"5.556
0.234415/64"5.953
0.25001/4"6.350
0.265617/64"6.747
0.28139/32"7.144
0.296919/64"7.541
0.31255/16"7.938
0.328121/64"8.334
0.343811/32"8.731
0.359423/64"9.128
0.37503/8"9.525
0.390625/64"9.922
0.406313/32"10.319
0.421927/64"10.716
0.43757/16"11.112
0.453129/64"11.509
0.468815/32"11.906
0.484431/64"12.303
0.50001/2"12.700
0.515633/64"13.097
0.531317/32"13.494
0.546935/64"13.891
0.56259/16"14.287
0.578137/64"14.684
0.593819/32"15.081
0.609439/64"15.478
0.62505/8"15.875
0.640641/64"16.272
0.656321/32"16.669
0.671943/64"17.066
0.687511/16"17.462
0.703145/64"17.859
0.718823/32"18.256
0.734447/64"18.653
0.75003/4"19.050
0.765649/64"19.447
0.781325/32"19.844
0.796951/64"20.241
0.812513/16"20.637
0.828153/64"21.034
0.843827/32"21.431
0.859455/64"21.828
0.87507/8"22.225
0.890657/64"22.622
0.906329/32"23.019
0.921959/64"23.416
0.937515/16"23.813
0.953161/64"24.209
0.968831/32"24.606
0.984463/64"25.003
1.00001"25.400

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File Details

Rows

65

Range

0" - 1"

PDF SIZE

0KB

High Res

300 DPI

How to Use This Chart

🔍

1. Find Your Value

Locate the decimal measurement from your digital caliper or blueprint in the left column.

↔️

2. Match the Fraction

Read across to find the nearest fractional equivalent. Note that not all decimals have exact fraction matches; choose the closest one.

🎯

3. Check Precision

Use the configuration panel to adjust precision (e.g., to 1/64") if you need finer granularity for machining or detailed woodworking.

Common Applications

CNC & Machining

Converting CAD decimal specs (e.g., 0.375) to manual machine inputs or selecting the correct drill bit size.

Woodworking

Translating digital plans often designed in decimals to standard tape measure marks which use fractions.

Engineering Design

Bridging the gap between Imperial (US) and Metric (World) specifications for international projects.

Frequently Asked Questions

Why isn't my exact decimal on the chart?
The chart generates values based on standard fractional steps (like 1/64"). If your specific decimal (e.g., 0.1234) isn't listed, it means it doesn't align perfectly with a standard fraction. Use the closest value or increase the precision setting.
How do I convert millimeters to fractions?
First, convert millimeters to decimal inches by dividing by 25.4. Then use this chart to find the nearest fraction. Alternatively, enable the 'Show Millimeters' column to compare directly.
Is this chart accurate enough for CNC work?
Yes, the chart provides 4 decimal places (0.0000) of precision. However, always verify critical tolerances. For ultra-precision aerospace work, direct calculation is recommended over a reference chart.
What is the difference between 1/16, 1/32, and 1/64 precision?
These refer to the smallest unit of measurement. 1/16" is common for rough carpentry, while 1/64" is standard for machining and fine woodworking where high accuracy is required.
Can I print this chart on A4 paper?
Yes! Use the configuration panel to select 'A4' under Paper Size before downloading the PDF. It is optimized to fit perfectly.
Is this chart free to use?
Yes, the basic chart and PDF downloads are completely free for personal and educational use. We offer premium templates for professional users.