1---
2category: '@Math'
3---
4 
5# usePrecision
6 
7Reactively set the precision of a number.
8 
9## Usage
10 
11```ts
12import { usePrecision } from '@vueuse/math'
13 
14const value = ref(3.1415)
15const result = usePrecision(value, 2) // 3.14
16 
17const ceilResult = usePrecision(value, 2, {
18  math: 'ceil'
19}) // 3.15
20 
21const floorResult = usePrecision(value, 3, {
22  math: 'floor'
23}) // 3.141
24```
25 
26## Type Declarations
27 
28```ts
29export interface UsePrecisionOptions {
30  /**
31   * Method to use for rounding
32   *
33   * @default 'round'
34   */
35  math?: "floor" | "ceil" | "round"
36}
37/**
38 * Reactively set the precision of a number.
39 *
40 * @see https://vueuse.org/usePrecision
41 *
42 * @__NO_SIDE_EFFECTS__
43 */
44export declare function usePrecision(
45  value: MaybeRefOrGetter<number>,
46  digits: MaybeRefOrGetter<number>,
47  options?: MaybeRefOrGetter<UsePrecisionOptions>,
48): ComputedRef<number>
49```
50