diff --git a/src/api/posts/create.rs b/src/api/posts/create.rs
index 7e10a6c..58e7ac5 100644
--- a/src/api/posts/create.rs
+++ b/src/api/posts/create.rs
@@ -93,7 +93,7 @@ pub async fn create_post(
 
         // 计算字数与阅读时长，随文章一并持久化，供列表查询直接使用。
         let word_count = crate::utils::text::count_words(&content_md);
-        let reading_time = (word_count / 200).max(1);
+        let reading_time = crate::utils::text::reading_time(word_count);
 
         // 发布状态的文章设置当前发布时间；草稿则为 None。
         let published_at = if post_status == PostStatus::Published {
diff --git a/src/api/posts/helpers.rs b/src/api/posts/helpers.rs
index bdb0cb8..117ea9d 100644
--- a/src/api/posts/helpers.rs
+++ b/src/api/posts/helpers.rs
@@ -8,7 +8,7 @@ use crate::api::error::AppError;
 #[cfg(feature = "server")]
 use crate::models::post::{Post, PostListItem, PostStatus};
 #[cfg(feature = "server")]
-use crate::utils::text::count_words;
+use crate::utils::text::{count_words, reading_time};
 
 /// 复用认证模块的当前 admin 用户获取逻辑。
 #[cfg(feature = "server")]
@@ -110,7 +110,7 @@ pub(super) async fn row_to_post_full(
         (stored_word_count as u32, stored_reading_time as u32)
     } else {
         let wc = count_words(&content_md);
-        (wc, (wc / 200).max(1))
+        (wc, reading_time(wc))
     };
 
     let content_html: Option<String> = row.get("content_html");
diff --git a/src/api/posts/rebuild.rs b/src/api/posts/rebuild.rs
index 83076f4..2142bde 100644
--- a/src/api/posts/rebuild.rs
+++ b/src/api/posts/rebuild.rs
@@ -76,7 +76,7 @@ pub async fn rebuild_content_html(rebuild_all: bool) -> Result<RebuildResult, Se
             };
 
             let word_count = crate::utils::text::count_words(&content_md);
-            let reading_time = (word_count / 200).max(1);
+            let reading_time = crate::utils::text::reading_time(word_count);
 
             match client
                 .execute(
diff --git a/src/api/posts/stats.rs b/src/api/posts/stats.rs
index 239a54c..dbf90ed 100644
--- a/src/api/posts/stats.rs
+++ b/src/api/posts/stats.rs
@@ -18,7 +18,8 @@ use crate::models::post::PostStats;
 
 /// 获取文章统计信息。
 ///
-/// 需要 admin 权限；优先命中缓存，未命中时分别统计总数、草稿数与已发布数。
+/// 需要 admin 权限；优先命中缓存，未命中时通过单次条件聚合查询同时统计
+/// 未删除文章总数、草稿数与已发布数。
 #[server(GetPostStats, "/api")]
 pub async fn get_post_stats() -> Result<PostStatsResponse, ServerFnError> {
     let _user = get_current_admin_user().await?;
diff --git a/src/api/posts/update.rs b/src/api/posts/update.rs
index f28069d..3962473 100644
--- a/src/api/posts/update.rs
+++ b/src/api/posts/update.rs
@@ -57,7 +57,7 @@ pub async fn update_post(
 
         // 重新计算字数与阅读时长，保持与正文同步。
         let word_count = crate::utils::text::count_words(&content_md);
-        let reading_time = (word_count / 200).max(1);
+        let reading_time = crate::utils::text::reading_time(word_count);
 
         let tx = client.transaction().await.map_err(AppError::tx)?;
 
diff --git a/src/utils/text.rs b/src/utils/text.rs
index bed63fc..8edbc8f 100644
--- a/src/utils/text.rs
+++ b/src/utils/text.rs
@@ -72,6 +72,13 @@ pub fn count_words(md: &str) -> u32 {
     count.max(1)
 }
 
+/// 由字数估算阅读时长（分钟）。
+///
+/// 按每分钟 200 字计算，至少返回 1 分钟。
+pub fn reading_time(word_count: u32) -> u32 {
+    (word_count / 200).max(1)
+}
+
 /// 自动生成文本摘要，取去除 Markdown 后的前 200 个字符。
 pub fn auto_summary(md: &str) -> String {
     let plain = strip_markdown(md);
@@ -158,6 +165,21 @@ mod tests {
         assert_eq!(count_words(""), 1);
     }
 
+    #[test]
+    fn reading_time_defaults_to_one() {
+        assert_eq!(reading_time(0), 1);
+        assert_eq!(reading_time(1), 1);
+        assert_eq!(reading_time(199), 1);
+    }
+
+    #[test]
+    fn reading_time_scales_by_two_hundred() {
+        assert_eq!(reading_time(200), 1);
+        assert_eq!(reading_time(201), 1);
+        assert_eq!(reading_time(400), 2);
+        assert_eq!(reading_time(1000), 5);
+    }
+
     #[test]
     fn auto_summary_truncates_at_200_chars() {
         let long_md: String = "a ".repeat(200);