Fraction to Decimal Chart (32nds of an Inch) | Precision Inch Conversion

Fraction to Decimal Conversion Chart for 32nds

1/32 inch equals 0.03125 decimal inches. This chart lists every 1/32-inch increment from 1/32 through 1 inch with decimal and millimeter equivalents. It is part of the reference charts on this site and a companion to the main fraction to decimal chart, which covers 16ths, 32nds, and 64ths in one interactive tool.

For rougher work where 1/16-inch accuracy is enough, use the 16ths of an inch chart. This 32nds chart is for finish carpentry, cabinetry, trim, and any project where half-sixteenth precision matters.

For even finer 1/64-inch increments used in machining and precision jig work, visit the main fraction to decimal chart and switch to the 64ths view.

How to Use This 32nds Chart

Find the 32nds fraction from your tape measure or plan, then look it up in the table to get the decimal-inch and millimeter values.

• Identify the fraction on your tape or drawing. On a 32nds tape, the smallest marks between the 16ths lines represent thirty-seconds. Count marks carefully — the third small mark past 1/2 inch is 19/32 inch, not 3/32 inch.
• Look up the decimal value. Locate the matching row and read the decimal column. Enter that number into layout software, CNC programs, or any of the construction calculators on this site.
• Read the millimeter column for metric specs. When matching Euro hinges, metric fasteners, or imported hardware, the mm value gives you a direct metric equivalent without extra math.
• Click any decimal value to copy it to your clipboard for pasting into CAD, a spreadsheet, or a CNC controller.
• Print the chart using the button above the table. The print layout is sized to fit a single sheet for shop or truck reference.

When You Need 1/32 Inch Accuracy

Finish carpentry and trim work are the most common scenarios where 1/32-inch precision pays off. Miter joints on crown molding, baseboard, and casing show gaps at fractions smaller than 1/16 inch. A 1/32-inch error on a miter can open to a visible line once the joint is assembled and the wood moves. Working to 32nds keeps those joints tight.

Cabinet doors, face frames, and drawer fronts also benefit from this level of accuracy. A face frame stile that is 1/32 inch too wide will create an uneven reveal across the run. Overlay doors and inset doors both rely on consistent gaps measured in thirty-seconds. Stair parts, built-in bookshelves, and detailed molding profiles fall into the same category — visible work where small differences show.

For framing, deck joists, and rough layout, 1/16 inch is accurate enough and the 16ths chart is the right reference. At the other end, machining, CNC routing, and precision jig setup may call for 1/64-inch accuracy — the 64ths of an inch chart covers that range. Choose the level of precision that matches your project requirements.

Common 32nds Fractions in Trim and Cabinetry

These are the 32nds increments that appear most often on shop drawings and finish carpentry plans. Fractions that simplify to 16ths or 8ths are included for completeness since they share the same scale.

Example: A shop drawing calls for a face frame stile 1-13/32 inches wide. Look up 13/32 in the chart: 0.4063 inches. The full width is 1.4063 inches, or 1.4063 × 25.4 = 35.72 mm. Enter that into your table saw’s digital readout or fence stop.

Example: You measure a hinge mortise at 0.2188 inches deep. Scan the decimal column and find 7/32 inch. Mark your router depth stop to 7/32 on the scale.

Related Tools

• Fraction to Decimal Chart — Full interactive conversion chart with 16ths, 32nds, and 64ths views plus a quick converter for any fraction.
• Fraction to Decimal Chart (16ths) — Simpler chart for general carpentry where 1/16-inch accuracy is enough.
• Lumber Dimensions Chart — Look up nominal vs actual lumber sizes where fractional dimensions like 1-1/2” and 3-1/2” are standard.
• Flooring Calculator — Calculate flooring coverage using plank dimensions that may require 32nds-level precision for hardwood tongue-and-groove.
• Drywall Calculator — Estimate sheets and materials for drywall projects where 1/2” and 5/8” thickness fractions are standard measurements.