diff --git a/src/assets/js/toolbox-data.js b/src/assets/js/toolbox-data.js
index e8e7d13..27d7fe0 100644
--- a/src/assets/js/toolbox-data.js
+++ b/src/assets/js/toolbox-data.js
@@ -11,7 +11,7 @@ export const toolList = [
   {
     id: 'calculation-tools',
     title: '计算',
-    enabled: false,
+    enabled: true,
     items: [
       {
         id: 'calc-download-time',
@@ -19,10 +19,10 @@ export const toolList = [
         title: '下载用时计算',
         iconClass: 'mdi mdi-calculator-variant-outline',
         desc: '根据设定的文件大小和下载速度简单计算大约下载完成所需的时间。',
-        createdAt: '',
-        updatedAt: '',
-        version: '0',
-        enabled: false,
+        createdAt: '2024-09-08',
+        updatedAt: '2024-09-08',
+        version: '1',
+        enabled: true,
       },
       {
         id: 'calc-ratio',
diff --git a/src/views/ToolboxView/Calculation/CalcDownloadTime.vue b/src/views/ToolboxView/Calculation/CalcDownloadTime.vue
index 714cdbc..2bac709 100644
--- a/src/views/ToolboxView/Calculation/CalcDownloadTime.vue
+++ b/src/views/ToolboxView/Calculation/CalcDownloadTime.vue
@@ -1,9 +1,209 @@
 <template>
-  <div class="tool-detail-page"></div>
+  <div class="tool-detail-page">
+
+    <!-- 参数 -->
+    <n-card size="small" title="参数">
+      <n-form
+        label-align="right"
+        label-placement="left"
+        label-width="auto"
+        :model="inputs"
+      >
+
+        <n-form-item label="文件大小：">
+          <n-input-group>
+            <n-input-number
+              v-model:value="inputs.sizeValue"
+              :precision="2"
+              :min="0"
+              :max="10000"
+              :step="1"
+            />
+            <n-select
+              v-model:value="inputs.sizeUnit"
+              label-field="name"
+              value-field="name"
+              :options="units"
+            />
+          </n-input-group>
+        </n-form-item>
+
+        <n-form-item label="已下载大小：">
+          <n-input-group>
+            <n-input-number
+              v-model:value="inputs.downloadedValue"
+              :precision="2"
+              :min="0"
+              :max="10000"
+              :step="1"
+            />
+            <n-select
+              v-model:value="inputs.downloadedUnit"
+              label-field="name"
+              value-field="name"
+              :options="units"
+            />
+          </n-input-group>
+        </n-form-item>
+
+        <n-form-item label="下载速度：">
+          <n-input-group>
+            <n-input-number
+              v-model:value="inputs.speedValue"
+              :precision="2"
+              :min="0"
+              :max="10000"
+              :step="1"
+            />
+            <n-select
+              v-model:value="inputs.speedUnit"
+              label-field="speed"
+              value-field="name"
+              :options="units"
+            />
+          </n-input-group>
+        </n-form-item>
+
+      </n-form>
+    </n-card>
+
+    <!-- 计算结果 -->
+    <n-card size="small" title="计算结果">
+      <n-form
+        label-align="right"
+        label-placement="left"
+        label-width="auto"
+        :model="outputs"
+      >
+
+        <n-form-item label="大约需要时长：">
+          <span>{{ outputs.duration || '未计算' }}</span>
+        </n-form-item>
+
+        <n-form-item label="大约结束时间：">
+          <span>{{ outputs.time || '未计算' }}</span>
+        </n-form-item>
+
+      </n-form>
+    </n-card>
+
+  </div>
 </template>
 
 <script setup>
+import {
+  NCard, NForm, NFormItem,
+  NInputGroup, NInputNumber, NSelect,
+} from 'naive-ui';
+
+import {
+  reactive, ref,
+  watch,
+} from 'vue';
+
+import {
+  $message,
+} from '@/assets/js/naive-ui';
+
+import dayjs from 'dayjs';
+
+/** 单位和比率（基于 KB） */
+const units = [
+  { name: 'KiB', speed: 'KiB/s', rate: 1 },
+  { name: 'MiB', speed: 'MiB/s', rate: 1024 },
+  { name: 'GiB', speed: 'GiB/s', rate: 1048576 },
+];
+
+/** 参数 */
+const inputs = reactive({
+  downloadedUnit: 'KiB',
+  downloadedValue: 0,
+  sizeUnit: 'KiB',
+  sizeValue: 0,
+  speedUnit: 'KiB',
+  speedValue: 0,
+});
+
+/** 计算结果 */
+const outputs = reactive({
+  duration: '',
+  time: '',
+});
+
+/** 防抖定时器 */
+const timer = ref(null);
+
+/** 计算结果 */
+function calc() {
+
+  let {
+    downloadedUnit, downloadedValue,
+    sizeUnit, sizeValue,
+    speedUnit, speedValue,
+  } = inputs;
+
+  if (sizeValue === 0 || speedValue === 0) {
+    outputs.duration = '';
+    outputs.time = '';
+    return;
+  }
+
+  // 获取转换比例
+  let downloadedRate = units[units.findIndex((obj) => {
+    return (obj.name === downloadedUnit);
+  })].rate;
+  let sizeRate = units[units.findIndex((obj) => {
+    return (obj.name === sizeUnit);
+  })].rate;
+  let speedRate = units[units.findIndex((obj) => {
+    return (obj.name === speedUnit);
+  })].rate;
+
+  // 转为 KB 单位
+  let realDownloaded = downloadedValue * downloadedRate;
+  let realSize = sizeValue * sizeRate - realDownloaded;
+  let realSpeed = speedValue * speedRate;
+
+  if (realSize < 0) {
+    $message.warning('参数有误，请检查');
+    return;
+  }
+
+  // 时长（秒）
+  let dSeconds = (realSize / realSpeed).toFixed(0);
+  // 起始时间
+  let timeStart = dayjs();
+  // 结束时间
+  let timeEnd = timeStart.add(dSeconds, 'second');
+  // 时长（天，整数）
+  let dDays = timeEnd.diff(timeStart, 'day');
+  // 最后一天的起始时间
+  let timeLastDay = timeStart.add(dDays, 'day');
+  // 时长（格式化，最后一天剩余）
+  let dLastDay = dayjs.duration(timeEnd.diff(timeLastDay)).format('HH 时 mm 分 ss 秒');
+
+  outputs.duration = `${dDays} 天 ${dLastDay}`;
+  outputs.time = timeEnd.format('YYYY-MM-DD HH:mm:ss');
+
+}
+
+// 自动计算
+watch(inputs, () => {
+  clearTimeout(timer.value);
+  timer.value = setTimeout(() => {
+    calc();
+  }, 1000);
+}, { deep: true });
 </script>
 
 <style lang="less" scoped>
+.tool-detail-page {
+  :deep(.n-input-number) {
+    width: 12em;
+  }
+
+  :deep(.n-select) {
+    width: 8em;
+  }
+}
 </style>
diff --git a/src/views/ToolboxView/ToolboxView.vue b/src/views/ToolboxView/ToolboxView.vue
index ae748de..799a83f 100644
--- a/src/views/ToolboxView/ToolboxView.vue
+++ b/src/views/ToolboxView/ToolboxView.vue
@@ -91,7 +91,7 @@ const routeTitle = computed(() => {
   return route.meta.title;
 });
 
-/** 
+/**
  * @description 打开工具
  * @param {ToolboxItem} data
  */
@@ -149,8 +149,25 @@ function handleOpenTool(data) {
   position: absolute;
   left: 0;
   top: 0;
+  padding: 20px;
   width: 100%;
   height: 100%;
   background-color: #FFF;
+
+  :deep(.tool-detail-page) {
+    width: 100%;
+    height: 100%;
+    overflow-y: auto;
+
+    > .n-card {
+      &:not(:first-child) {
+        margin-top: 20px;
+      }
+
+      .n-card__content {
+        padding-top: var(--n-padding-top);
+      }
+    }
+  }
 }
 </style>