diff --git a/utils/Tools.ts b/utils/Tools.ts
new file mode 100644
index 0000000..81772a5
--- /dev/null
+++ b/utils/Tools.ts
@@ -0,0 +1,29 @@
+import { UserPemissionFlags } from '../types'
+import { perms } from './Constants'
+
+function formatNumber(num: number, digits = 1) {
+	const si = [
+		{ value: 1, symbol: '' },
+		{ value: 1e3, symbol: '천' },
+		{ value: 1e4, symbol: '만' },
+		{ value: 1e8, symbol: '억' },
+		{ value: 1e12, symbol: '조' },
+		{ value: 1e16, symbol: '해' },
+	]
+	const rx = /\.0+$|(\.[0-9]*[1-9])0+$/
+	let i
+	for (i = si.length - 1; i > 0; i--) {
+		if (num >= si[i].value) {
+			break
+		}
+	}
+	return (num / si[i].value).toFixed(digits).replace(rx, '$1') + si[i].symbol
+}
+
+function checkPerm(base: number, required: number | UserPemissionFlags) {
+	required = typeof required === 'number' ? required : perms[required]
+	if (typeof required !== 'number' && !required) throw new Error('올바르지 않은 권한입니다.')
+	return (base & required) === required
+}
+
+export { formatNumber, checkPerm }
diff --git a/utils/index.ts b/utils/index.ts
index 839316b..df7ac30 100644
--- a/utils/index.ts
+++ b/utils/index.ts
@@ -1,26 +1,6 @@
 import * as Query from './Query'
-import * as Constants from './Constants'
+import { formatNumber } from './Tools'
 import ResponseWrapper from './ResponseWrapper'
 import Fetch from './Fetch'
 
-function formatNumber(num:number, digits=1) {
-	const si = [
-		{ value: 1, symbol: '' },
-		{ value: 1E3, symbol: '천' },
-		{ value: 1E4, symbol: '만' },
-		{ value: 1E8, symbol: '억' },
-		{ value: 1E12, symbol: '조' },
-		{ value: 1E16, symbol: '해' }
-	]
-	const rx = /\.0+$|(\.[0-9]*[1-9])0+$/
-	let i
-	for (i = si.length - 1; i > 0; i--) {
-		if (num >= si[i].value) {
-			break
-		}
-	}
-	return (num / si[i].value).toFixed(digits).replace(rx, '$1') + si[i].symbol
-}
-
-
-export { Query, Constants, Fetch, ResponseWrapper, formatNumber }
+export { Query, Fetch, ResponseWrapper, formatNumber }