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src/lib/hypixel/level.ts

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+const BASE = 10000;
+const GROWTH = 2500;
+
+const HALF_GROWTH = 0.5 * GROWTH;
+
+const REVERSE_PQ_PREFIX = -(BASE - 0.5 * GROWTH) / GROWTH;
+const REVERSE_CONST = REVERSE_PQ_PREFIX * REVERSE_PQ_PREFIX;
+const GROWTH_DIVIDES_2 = 2 / GROWTH;
+
+export function getLevel(exp: number) {
+    return exp <= 1 ? 1 : Math.floor(1 + REVERSE_PQ_PREFIX + Math.sqrt(REVERSE_CONST + GROWTH_DIVIDES_2 * exp));
+}
+
+export function getExactLevel(exp: number) {
+    return getLevel(exp) + getPercentageToNextLevel(exp);
+}
+
+// function getExpFromLevelToNext(level: number) {
+//     return level < 1 ? BASE : GROWTH * (level - 1) + BASE;
+// }
+
+function getTotalExpToLevel(level: number) {
+    const lv = Math.floor(level); const
+        x0 = getTotalExpToFullLevel(lv);
+    if (level === lv) return x0;
+    return (getTotalExpToFullLevel(lv + 1) - x0) * (level % 1) + x0;
+}
+
+function getTotalExpToFullLevel(level: number) {
+    return (HALF_GROWTH * (level - 2) + BASE) * (level - 1);
+}
+
+function getPercentageToNextLevel(exp: number) {
+    const lv = getLevel(exp);
+    const x0 = getTotalExpToLevel(lv);
+    return (exp - x0) / (getTotalExpToLevel(lv + 1) - x0);
+}