diff --git a/src/app/(main)/ad-revenue-report/page.tsx b/src/app/(main)/ad-revenue-report/page.tsx
index e46de3c..e798ad6 100644
--- a/src/app/(main)/ad-revenue-report/page.tsx
+++ b/src/app/(main)/ad-revenue-report/page.tsx
@@ -30,7 +30,7 @@ import {
 } from '@ant-design/icons';
 import dayjs, { type Dayjs } from 'dayjs';
 import { api, errMsg } from '@/lib/api';
-import { formatUtcTime, percentile } from '@/lib/format';
+import { formatUtcTime, nearestRankPercentile } from '@/lib/format';
 import type {
   AdRevenueDaily,
   AdRevenueHourly,
@@ -758,9 +758,9 @@ export default function AdRevenueReportPage() {
         .filter((item) => item.feed_scene === sceneName)
         .map((item) => item.sub_count ?? 1);
       return {
-        p5: percentile(counts, 0.05, false),
-        p50: percentile(counts, 0.5, false),
-        p95: percentile(counts, 0.95, false),
+        p5: nearestRankPercentile(counts, 0.05),
+        p50: nearestRankPercentile(counts, 0.5),
+        p95: nearestRankPercentile(counts, 0.95),
       };
     };
     return { coupon: summarize('coupon'), comparison: summarize('comparison') };
@@ -1083,12 +1083,12 @@ export default function AdRevenueReportPage() {
             </Typography.Text>
           </Divider>
           <Row gutter={[16, 12]}>
-            <Col span={4}><Statistic title="单次领券广告数 P5" value={sessionAdCounts.coupon.p5 ?? '-'} precision={1} /></Col>
-            <Col span={4}><Statistic title="单次领券广告数 P50" value={sessionAdCounts.coupon.p50 ?? '-'} precision={1} /></Col>
-            <Col span={4}><Statistic title="单次领券广告数 P95" value={sessionAdCounts.coupon.p95 ?? '-'} precision={1} /></Col>
-            <Col span={4}><Statistic title="单次比价广告数 P5" value={sessionAdCounts.comparison.p5 ?? '-'} precision={1} /></Col>
-            <Col span={4}><Statistic title="单次比价广告数 P50" value={sessionAdCounts.comparison.p50 ?? '-'} precision={1} /></Col>
-            <Col span={4}><Statistic title="单次比价广告数 P95" value={sessionAdCounts.comparison.p95 ?? '-'} precision={1} /></Col>
+            <Col span={4}><Statistic title="单次领券广告数 P5" value={sessionAdCounts.coupon.p5 ?? '-'} precision={0} /></Col>
+            <Col span={4}><Statistic title="单次领券广告数 P50" value={sessionAdCounts.coupon.p50 ?? '-'} precision={0} /></Col>
+            <Col span={4}><Statistic title="单次领券广告数 P95" value={sessionAdCounts.coupon.p95 ?? '-'} precision={0} /></Col>
+            <Col span={4}><Statistic title="单次比价广告数 P5" value={sessionAdCounts.comparison.p5 ?? '-'} precision={0} /></Col>
+            <Col span={4}><Statistic title="单次比价广告数 P50" value={sessionAdCounts.comparison.p50 ?? '-'} precision={0} /></Col>
+            <Col span={4}><Statistic title="单次比价广告数 P95" value={sessionAdCounts.comparison.p95 ?? '-'} precision={0} /></Col>
           </Row>
         </Card>
       )}
diff --git a/src/lib/format.ts b/src/lib/format.ts
index a1d7af3..15dab59 100644
--- a/src/lib/format.ts
+++ b/src/lib/format.ts
@@ -37,6 +37,18 @@ export function percentile(values: readonly number[], q: number, round = true):
   return round ? Math.round(result) : result;
 }
 
+/**
+ * 离散计数分位数（nearest-rank）。
+ * 广告条数等不可拆分的计数不做线性插值，结果始终取自真实样本。
+ */
+export function nearestRankPercentile(values: readonly number[], q: number): number | null {
+  if (!values.length) return null;
+  const sorted = [...values].sort((a, b) => a - b);
+  const quantile = Math.min(1, Math.max(0, q));
+  const rank = Math.max(1, Math.ceil(quantile * sorted.length));
+  return sorted[rank - 1];
+}
+
 const hasTz = (v: string) => /(?:Z|[+-]\d{2}:?\d{2})$/i.test(v);
 
 /** 把 UTC 口径字符串解析为带时区的 dayjs(无时区后缀的补 Z 当 UTC)。 */