Machining & Architectural Suite•1/64″ Precision & Metric

tools.decimalToInches

소수 인치를 분수 인치(1/16″, 1/32″, 1/64″), 피트+인치 및 미터법 밀리미터(mm)로 변환합니다. 대화형 눈금자 시각화를 제공합니다.

Common drill / bolt sizes:
Fractional Inches
3 7/8″
Feet & Inches0′ 3 7/8″
Metric Equivalent98.43 mm (9.843 cm)
Rounding Error / Delta0.00 thou (0.00 mm)
calc.copy
Interactive Visual Ruler (1-Inch Scale)7/8″ Position
0
1/4
1/2
3/4
1″
fx

calc.steps — Inches to Fraction Proof

Type any decimal value above to generate step-by-step arithmetic proof.

Fractional Inches to Millimeters Conversion Chart

Standard increments from 1/16″ to 1″ with millimeter metric equivalents.

Decimal InchFractional InchMillimeters (mm)DescriptionAction
0.0625″1/16″1.588 mm1/16 Inch
0.1250″1/8″3.175 mm2/16 Inch
0.1875″3/16″4.763 mm3/16 Inch
0.2500″1/4″6.350 mmQuarter Inch
0.3125″5/16″7.938 mm5/16 Inch
0.3750″3/8″9.525 mmThree Eighths
0.4375″7/16″11.113 mm7/16 Inch
0.5000″1/2″12.700 mmHalf Inch
0.6250″5/8″15.875 mmFive Eighths
0.7500″3/4″19.050 mmThree Quarters
0.8750″7/8″22.225 mmSeven Eighths
1.0000″1″25.400 mmOne Inch

Frequently Asked Questions

Everything you need to know about decimal conversions, accuracy, and formulas.

01How do you convert decimal inches to fractional inches?▼

To convert decimal inches to fractions: 1) Multiply the fractional part of the decimal by your desired denominator (such as 16, 32, or 64). 2) Round to the nearest whole number to get the numerator. 3) Reduce the resulting fraction (e.g. 12/16 reduces to 3/4) and combine with the whole inches.

02How many millimeters are in an inch?▼

By international agreement, exactly 1 inch = 25.4 millimeters (2.54 centimeters). To convert decimal inches to millimeters, simply multiply the inches value by 25.4.

03What is a 'thou' or 'mil' in engineering measurements?▼

A thou (thousandth of an inch, or mil) equals 0.001 inches (0.0254 mm). It is the standard precision measurement unit used in machining, PCB manufacturing, and mechanical engineering.

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