diff --git a/frontend/src/components/account/AccountUsageCell.vue b/frontend/src/components/account/AccountUsageCell.vue
index 554295f97e..339e07bcf1 100644
--- a/frontend/src/components/account/AccountUsageCell.vue
+++ b/frontend/src/components/account/AccountUsageCell.vue
@@ -134,6 +134,7 @@
           :utilization="usageInfo.seven_day.utilization"
           :resets-at="usageInfo.seven_day.resets_at"
           :window-stats="usageInfo.seven_day.window_stats"
+          :estimated-total-cost="openAISevenDayEstimatedTotalCost"
           :show-now-when-idle="true"
           color="emerald"
         />
@@ -784,6 +785,25 @@ const hasOpenAIUsageFallback = computed(() => {
   return !!usageInfo.value?.five_hour || !!usageInfo.value?.seven_day
 })
 
+const openAISevenDayEstimatedTotalCost = computed(() => {
+  const sevenDay = usageInfo.value?.seven_day
+  const utilization = sevenDay?.utilization
+  const currentCost = sevenDay?.window_stats?.cost
+  if (
+    typeof utilization !== 'number' ||
+    typeof currentCost !== 'number' ||
+    !Number.isFinite(utilization) ||
+    !Number.isFinite(currentCost) ||
+    utilization <= 0 ||
+    currentCost <= 0
+  ) {
+    return null
+  }
+
+  const estimate = (currentCost * 100) / utilization
+  return Number.isFinite(estimate) && estimate > 0 ? estimate : null
+})
+
 const openAIUsageRefreshKey = computed(() => buildOpenAIUsageRefreshKey(props.account))
 
 const shouldAutoLoadUsageOnMount = computed(() => {
diff --git a/frontend/src/components/account/UsageProgressBar.vue b/frontend/src/components/account/UsageProgressBar.vue
index 75c84a8305..1f7cde1645 100644
--- a/frontend/src/components/account/UsageProgressBar.vue
+++ b/frontend/src/components/account/UsageProgressBar.vue
@@ -22,6 +22,14 @@
         >
           U ${{ formatUserCost }}
         </span>
+        <span
+          v-if="estimatedTotalCost != null"
+          data-test="estimated-total-cost"
+          class="rounded bg-gray-100 px-1.5 py-0.5 dark:bg-gray-800"
+          :title="t('admin.accounts.usageWindow.estimatedTotalCostTooltip')"
+        >
+          {{ t('admin.accounts.usageWindow.estimatedTotalCost', { cost: estimatedTotalCost.toFixed(2) }) }}
+        </span>
       </div>
     </div>
 
@@ -67,6 +75,7 @@ const props = withDefaults(
     resetsAt?: string | null
     color: 'indigo' | 'emerald' | 'purple' | 'amber'
     windowStats?: WindowStats | null
+    estimatedTotalCost?: number | null
     showNowWhenIdle?: boolean
     remainingCapacity?: boolean
     /** fixed: 定宽居中徽章（账号页纵向对齐）；auto: 限宽截断左对齐（监控页组合标签） */
diff --git a/frontend/src/components/account/__tests__/AccountUsageCell.spec.ts b/frontend/src/components/account/__tests__/AccountUsageCell.spec.ts
index 5ee8e5805a..ead39a7013 100644
--- a/frontend/src/components/account/__tests__/AccountUsageCell.spec.ts
+++ b/frontend/src/components/account/__tests__/AccountUsageCell.spec.ts
@@ -441,6 +441,84 @@ describe('AccountUsageCell', () => {
     expect(wrapper.text()).toContain('7d|36|900')
   })
 
+  it('仅为 OpenAI OAuth 7d 窗口计算预计总费用', async () => {
+    getUsage.mockResolvedValue({
+      five_hour: {
+        utilization: 25,
+        resets_at: null,
+        remaining_seconds: 0,
+        window_stats: { requests: 1, tokens: 100, cost: 2 }
+      },
+      seven_day: {
+        utilization: 40,
+        resets_at: null,
+        remaining_seconds: 0,
+        window_stats: { requests: 2, tokens: 200, cost: 12 }
+      }
+    })
+
+    const wrapper = mount(AccountUsageCell, {
+      props: {
+        account: makeAccount({ id: 6752, platform: 'openai', type: 'oauth' })
+      },
+      global: {
+        stubs: {
+          UsageProgressBar: {
+            props: ['label', 'estimatedTotalCost'],
+            template: '<div class="usage-bar">{{ label }}|{{ estimatedTotalCost ?? "none" }}</div>'
+          },
+          AccountQuotaInfo: true
+        }
+      }
+    })
+
+    await flushPromises()
+
+    expect(wrapper.text()).toContain('5h|none')
+    expect(wrapper.text()).toContain('7d|30')
+  })
+
+  it.each([
+    { id: 6801, utilization: 0, cost: 12 },
+    { id: 6802, utilization: -1, cost: 12 },
+    { id: 6803, utilization: Number.NaN, cost: 12 },
+    { id: 6804, utilization: 40, cost: 0 },
+    { id: 6805, utilization: 40, cost: Number.POSITIVE_INFINITY }
+  ])('OpenAI OAuth 7d 输入无效时不显示预计总费用 (%o)', async ({ id, utilization, cost }) => {
+    getUsage.mockResolvedValue({
+      seven_day: {
+        utilization,
+        resets_at: null,
+        remaining_seconds: 0,
+        window_stats: { requests: 1, tokens: 100, cost }
+      }
+    })
+
+    const wrapper = mount(AccountUsageCell, {
+      props: {
+        account: makeAccount({
+          id,
+          platform: 'openai',
+          type: 'oauth'
+        })
+      },
+      global: {
+        stubs: {
+          UsageProgressBar: {
+            props: ['label', 'estimatedTotalCost'],
+            template: '<div class="usage-bar">{{ label }}|{{ estimatedTotalCost ?? "none" }}</div>'
+          },
+          AccountQuotaInfo: true
+        }
+      }
+    })
+
+    await flushPromises()
+
+    expect(wrapper.text()).toContain('7d|none')
+    expect(wrapper.text()).not.toMatch(/Infinity|NaN/)
+  })
+
   it('OpenAI OAuth 有现成快照时，手动刷新信号会触发 usage 重拉', async () => {
     getUsage.mockResolvedValue({
       five_hour: {
diff --git a/frontend/src/i18n/locales/en/admin/accounts.ts b/frontend/src/i18n/locales/en/admin/accounts.ts
index fb7a81a330..8a86a367cc 100644
--- a/frontend/src/i18n/locales/en/admin/accounts.ts
+++ b/frontend/src/i18n/locales/en/admin/accounts.ts
@@ -1534,7 +1534,9 @@ export default {
         grokLastProbe: 'Probe {time}',
         grokLastHeadersSeen: 'Headers {time}',
         passiveSampled: 'Passive',
-        activeQuery: 'Query'
+        activeQuery: 'Query',
+        estimatedTotalCost: 'Est. total ${cost}',
+        estimatedTotalCostTooltip: 'Estimated total cost at 100% utilization, based on current window cost and utilization'
       },
       openaiQuotaReset: {
         count: 'Credits',
diff --git a/frontend/src/i18n/locales/zh/admin/accounts.ts b/frontend/src/i18n/locales/zh/admin/accounts.ts
index 64f5e96e5f..872d5b1a26 100644
--- a/frontend/src/i18n/locales/zh/admin/accounts.ts
+++ b/frontend/src/i18n/locales/zh/admin/accounts.ts
@@ -479,7 +479,9 @@ export default {
         grokLastProbe: '探测 {time}',
         grokLastHeadersSeen: '响应头 {time}',
         passiveSampled: '被动采样',
-        activeQuery: '查询'
+        activeQuery: '查询',
+        estimatedTotalCost: '预计总费用 ${cost}',
+        estimatedTotalCostTooltip: '根据当前窗口费用和使用率估算达到 100% 使用率时的总费用'
       },
       openaiQuotaReset: {
         count: '次数',