Rounding numbers to specific multiples

Question

How can I round to a specific multiple in Java? In excel there is the mround function which allows for easy rounding to a specified multiple like so:

    mRound(variable,multiple)

so mRound(x,3) would return 9 if x = 7.9 and 6 if x = 7.2.

All of the rounding functions I have found so far always round to the nearest whole number or to a specified number of decimal places but I want to be able to change the multiple for each variable. Does anyone know what function would be best for this situation?

No single function for that. `mul*round(x/mul)`. – Marko Topolnik May 04 '12 at 21:50 — Marko Topolnik, May 04 '12 at 21:50

score 21 · Accepted Answer · answered May 04 '12 at 21:50

21

Just divide by the number, round, and multiply by the number.

double mRound(double value, double factor) {
    return Math.round(value / factor) * factor;
}

answered May 04 '12 at 21:50

Ry-

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Yes... although I suspect both `factor` and the return value should be `int`s. – Clockwork-Muse May 04 '12 at 21:56
@X-Zero: Making `factor` a `double` makes it possible to use values like `0.001` to round to the nearest thousandth. – Ry- May 04 '12 at 21:57

Rounding numbers to specific multiples

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