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NumberWithPrecision is a general programming concept describing a function or method that produces a numeric value or its textual representation rounded or formatted to a specified precision. The exact behavior varies by language and library, but the goal is to control how many digits are used to express a number for display, storage, or further computation.

There are two common variants. Fixed decimal places formats specify a set number of digits after the decimal point. Significant figures formats count digits starting from the first non-zero digit, regardless of decimal point position. Fixed decimal places is often used for monetary values or measurements, while significant figures are common in scientific calculations where precision reflects measurement uncertainty. Implementations may return either a numeric value (rounded to the desired precision) or a string suitable for display.

Examples across languages illustrate the idea rather than a universal standard. In JavaScript, toFixed(n) returns a string with n digits after the decimal point, while converting the result to a number yields a numeric value with that precision. In Python, round(value, n) returns a numeric result, and format(value, f"{{:.{n}f}}") yields a string. In Java, BigDecimal or DecimalFormat can achieve fixed precision, and in .NET, Math.Round with a specified number of digits applies the same concept.

Because NumberWithPrecision is not a universal API name, its exact behavior depends on the language and library used. Users should consult specific documentation for rounding rules, locale considerations, and the distinction between numeric results and string representations. See also rounding, numeric formatting, decimal places, and significant figures.