Decimal Fraction Conversion
Closest fractional approximation
Required Parameters
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Quick Answer
Convert decimals to fractions by multiplying by the desired denominator. 0.375 = 3/8 (multiply by 8, get 3). Common equivalents: 1/4 = 0.25, 1/3 = 0.333, 1/2 = 0.5, 3/4 = 0.75. Essential for drill sizes, machining, and Imperial measurements.
Convertisseur Decimal vers Fraction
Convertissez des nombres decimaux en fractions et vice versa.
Design Notes
Fractional inches are standard in US manufacturing: drill bit sizes, wrench sizes, pipe fittings, and lumber dimensions all use fractions. PCB mounting holes typically use fractional inch drills (1/8 inch, 5/32 inch). The continued fraction algorithm finds the best rational approximation.
Common Mistakes
- 1
Confusing decimal inches with fractional inches — 0.125 inch = 1/8 inch, not approximately 1/8.
- 2
Using fractions for metric measurements — metric uses decimals (2.5 mm, not 2 1/2 mm).
- 3
Forgetting to reduce fractions to lowest terms after conversion.
Knowledge Base
Pourquoi utiliser des fractions en ingénierie ?
Essentiel dans les ateliers : forets (1/16"), clés (7/16"), raccords de tuyauterie. Les cotes impériales sur les plans mécaniques sont en fractions de pouce.
Comment convertir un décimal en fraction ?
Multipliez par le dénominateur souhaité : 0,375 × 8 = 3, donc 0,375 = 3/8. Pour simplifier : divisez numérateur et dénominateur par le PGCD.