Tool that Rounds to the Nearest Fraction

When working in trades like carpentry, machining or cooking, you often run into decimal measurements that are difficult or impossible to translate to a standard ruler, tape measure, or measuring cup. Sometimes, you just need to work with fractions.

While a CAD program might output a required component hole as 0.6875 inches, a person on the shop floor needs to select a tool or check a dimension using the common fraction 11/16 inches. Similarly, scaling a recipe can result in awkward numbers like 0.833 cups, which is much easier to manage when converted to a practical fraction like 5/6 or the nearest standard measuring cup size. Below is the tool that is designed to bridge that gap by converting any decimal into its closest usable fraction.

The Fractional Rounding Tool (below) takes any decimal number and, based on your chosen level of granularity (the maximum denominator, such as 1/8 or 1/16), it determines the nearest possible fraction. This is essential because it allows you to standardize your precision and use common measuring instruments effectively. You also have full control over the rounding method, which dictates how the tool handles numbers that fall exactly halfway between two fractions. This is a great feature when working with tolerances, negative numbers or specific industry standards like rounding half up or half even. Use the tool below to instantly convert your decimal plans into measurable, actionable fractions.

Fractional Rounding Tool 📏

Decimal Number to Round (e.g., 4.375)

Round to the Nearest Fraction (Max Denominator)

Nearest 1/2 Nearest 1/4 Nearest 1/8 Nearest 1/16 (Standard Measure) Nearest 1/32 Nearest 1/64 Nearest 1/10 (Metric) Nearest 1/100

Rounding Mode (Determines how to choose the nearest numerator)

0: Round Up 1: Round Down 2: Round Ceil 3: Round Floor 4: Round Half Up (Standard) 5: Round Half Down 6: Round Half Even (Banker's) 7: Round Half Ceil

Rounded Fractional Result (Simplified)

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