diff --git a/backend/internal/handler/dto/mappers.go b/backend/internal/handler/dto/mappers.go
index 83bf9f38..d6fe81ba 100644
--- a/backend/internal/handler/dto/mappers.go
+++ b/backend/internal/handler/dto/mappers.go
@@ -71,7 +71,7 @@ func APIKeyFromService(k *service.APIKey) *APIKey {
 	if k == nil {
 		return nil
 	}
-	return &APIKey{
+	out := &APIKey{
 		ID:            k.ID,
 		UserID:        k.UserID,
 		Key:           k.Key,
@@ -98,6 +98,19 @@ func APIKeyFromService(k *service.APIKey) *APIKey {
 		User:          UserFromServiceShallow(k.User),
 		Group:         GroupFromServiceShallow(k.Group),
 	}
+	if k.Window5hStart != nil && !service.IsWindowExpired(k.Window5hStart, service.RateLimitWindow5h) {
+		t := k.Window5hStart.Add(service.RateLimitWindow5h)
+		out.Reset5hAt = &t
+	}
+	if k.Window1dStart != nil && !service.IsWindowExpired(k.Window1dStart, service.RateLimitWindow1d) {
+		t := k.Window1dStart.Add(service.RateLimitWindow1d)
+		out.Reset1dAt = &t
+	}
+	if k.Window7dStart != nil && !service.IsWindowExpired(k.Window7dStart, service.RateLimitWindow7d) {
+		t := k.Window7dStart.Add(service.RateLimitWindow7d)
+		out.Reset7dAt = &t
+	}
+	return out
 }
 
 func GroupFromServiceShallow(g *service.Group) *Group {
diff --git a/backend/internal/handler/dto/types.go b/backend/internal/handler/dto/types.go
index a11ea390..828b24f9 100644
--- a/backend/internal/handler/dto/types.go
+++ b/backend/internal/handler/dto/types.go
@@ -57,6 +57,9 @@ type APIKey struct {
 	Window5hStart *time.Time `json:"window_5h_start"`
 	Window1dStart *time.Time `json:"window_1d_start"`
 	Window7dStart *time.Time `json:"window_7d_start"`
+	Reset5hAt     *time.Time `json:"reset_5h_at,omitempty"`
+	Reset1dAt     *time.Time `json:"reset_1d_at,omitempty"`
+	Reset7dAt     *time.Time `json:"reset_7d_at,omitempty"`
 
 	User  *User  `json:"user,omitempty"`
 	Group *Group `json:"group,omitempty"`
diff --git a/backend/internal/handler/gateway_handler.go b/backend/internal/handler/gateway_handler.go
index 148d83e9..88502f77 100644
--- a/backend/internal/handler/gateway_handler.go
+++ b/backend/internal/handler/gateway_handler.go
@@ -972,33 +972,45 @@ func (h *GatewayHandler) usageQuotaLimited(c *gin.Context, ctx context.Context,
 			var rateLimits []gin.H
 			if apiKey.RateLimit5h > 0 {
 				used := rateLimitData.EffectiveUsage5h()
-				rateLimits = append(rateLimits, gin.H{
+				entry := gin.H{
 					"window":       "5h",
 					"limit":        apiKey.RateLimit5h,
 					"used":         used,
 					"remaining":    max(0, apiKey.RateLimit5h-used),
 					"window_start": rateLimitData.Window5hStart,
-				})
+				}
+				if rateLimitData.Window5hStart != nil && !service.IsWindowExpired(rateLimitData.Window5hStart, service.RateLimitWindow5h) {
+					entry["reset_at"] = rateLimitData.Window5hStart.Add(service.RateLimitWindow5h)
+				}
+				rateLimits = append(rateLimits, entry)
 			}
 			if apiKey.RateLimit1d > 0 {
 				used := rateLimitData.EffectiveUsage1d()
-				rateLimits = append(rateLimits, gin.H{
+				entry := gin.H{
 					"window":       "1d",
 					"limit":        apiKey.RateLimit1d,
 					"used":         used,
 					"remaining":    max(0, apiKey.RateLimit1d-used),
 					"window_start": rateLimitData.Window1dStart,
-				})
+				}
+				if rateLimitData.Window1dStart != nil && !service.IsWindowExpired(rateLimitData.Window1dStart, service.RateLimitWindow1d) {
+					entry["reset_at"] = rateLimitData.Window1dStart.Add(service.RateLimitWindow1d)
+				}
+				rateLimits = append(rateLimits, entry)
 			}
 			if apiKey.RateLimit7d > 0 {
 				used := rateLimitData.EffectiveUsage7d()
-				rateLimits = append(rateLimits, gin.H{
+				entry := gin.H{
 					"window":       "7d",
 					"limit":        apiKey.RateLimit7d,
 					"used":         used,
 					"remaining":    max(0, apiKey.RateLimit7d-used),
 					"window_start": rateLimitData.Window7dStart,
-				})
+				}
+				if rateLimitData.Window7dStart != nil && !service.IsWindowExpired(rateLimitData.Window7dStart, service.RateLimitWindow7d) {
+					entry["reset_at"] = rateLimitData.Window7dStart.Add(service.RateLimitWindow7d)
+				}
+				rateLimits = append(rateLimits, entry)
 			}
 			if len(rateLimits) > 0 {
 				resp["rate_limits"] = rateLimits
diff --git a/backend/internal/repository/api_key_repo.go b/backend/internal/repository/api_key_repo.go
index 451c61e5..95db1819 100644
--- a/backend/internal/repository/api_key_repo.go
+++ b/backend/internal/repository/api_key_repo.go
@@ -476,8 +476,8 @@ func (r *apiKeyRepository) IncrementRateLimitUsage(ctx context.Context, id int64
 			usage_1d = CASE WHEN window_1d_start IS NOT NULL AND window_1d_start + INTERVAL '24 hours' <= NOW() THEN $1 ELSE usage_1d + $1 END,
 			usage_7d = CASE WHEN window_7d_start IS NOT NULL AND window_7d_start + INTERVAL '7 days' <= NOW() THEN $1 ELSE usage_7d + $1 END,
 			window_5h_start = CASE WHEN window_5h_start IS NULL OR window_5h_start + INTERVAL '5 hours' <= NOW() THEN NOW() ELSE window_5h_start END,
-			window_1d_start = CASE WHEN window_1d_start IS NULL OR window_1d_start + INTERVAL '24 hours' <= NOW() THEN NOW() ELSE window_1d_start END,
-			window_7d_start = CASE WHEN window_7d_start IS NULL OR window_7d_start + INTERVAL '7 days' <= NOW() THEN NOW() ELSE window_7d_start END,
+			window_1d_start = CASE WHEN window_1d_start IS NULL OR window_1d_start + INTERVAL '24 hours' <= NOW() THEN date_trunc('day', NOW()) ELSE window_1d_start END,
+			window_7d_start = CASE WHEN window_7d_start IS NULL OR window_7d_start + INTERVAL '7 days' <= NOW() THEN date_trunc('day', NOW()) ELSE window_7d_start END,
 			updated_at = NOW()
 		WHERE id = $2 AND deleted_at IS NULL`,
 		cost, id)
@@ -491,9 +491,9 @@ func (r *apiKeyRepository) ResetRateLimitWindows(ctx context.Context, id int64)
 			usage_5h = CASE WHEN window_5h_start IS NOT NULL AND window_5h_start + INTERVAL '5 hours' <= NOW() THEN 0 ELSE usage_5h END,
 			window_5h_start = CASE WHEN window_5h_start IS NOT NULL AND window_5h_start + INTERVAL '5 hours' <= NOW() THEN NOW() ELSE window_5h_start END,
 			usage_1d = CASE WHEN window_1d_start IS NOT NULL AND window_1d_start + INTERVAL '24 hours' <= NOW() THEN 0 ELSE usage_1d END,
-			window_1d_start = CASE WHEN window_1d_start IS NOT NULL AND window_1d_start + INTERVAL '24 hours' <= NOW() THEN NOW() ELSE window_1d_start END,
+			window_1d_start = CASE WHEN window_1d_start IS NOT NULL AND window_1d_start + INTERVAL '24 hours' <= NOW() THEN date_trunc('day', NOW()) ELSE window_1d_start END,
 			usage_7d = CASE WHEN window_7d_start IS NOT NULL AND window_7d_start + INTERVAL '7 days' <= NOW() THEN 0 ELSE usage_7d END,
-			window_7d_start = CASE WHEN window_7d_start IS NOT NULL AND window_7d_start + INTERVAL '7 days' <= NOW() THEN NOW() ELSE window_7d_start END,
+			window_7d_start = CASE WHEN window_7d_start IS NOT NULL AND window_7d_start + INTERVAL '7 days' <= NOW() THEN date_trunc('day', NOW()) ELSE window_7d_start END,
 			updated_at = NOW()
 		WHERE id = $1 AND deleted_at IS NULL`,
 		id)
diff --git a/frontend/src/i18n/locales/en.ts b/frontend/src/i18n/locales/en.ts
index ecd13940..b16b2f22 100644
--- a/frontend/src/i18n/locales/en.ts
+++ b/frontend/src/i18n/locales/en.ts
@@ -153,6 +153,7 @@ export default {
     todayExpires: '(expires today)',
     daysLeft: '({days} days)',
     usedQuota: 'Used Quota',
+    resetNow: 'Resetting soon',
     subscriptionType: 'Subscription Type',
     subscriptionExpires: 'Subscription Expires',
     // Usage stat cells
@@ -660,6 +661,7 @@ export default {
     resetRateLimitConfirmMessage: 'Are you sure you want to reset the rate limit usage for key "{name}"? All time window usage will be reset to zero. This action cannot be undone.',
     rateLimitResetSuccess: 'Rate limit usage reset successfully',
     failedToResetRateLimit: 'Failed to reset rate limit usage',
+    resetNow: 'Resetting soon',
     expiration: 'Expiration',
     expiresInDays: '{days} days',
     extendDays: '+{days} days',
diff --git a/frontend/src/i18n/locales/zh.ts b/frontend/src/i18n/locales/zh.ts
index 0238595e..39064c4b 100644
--- a/frontend/src/i18n/locales/zh.ts
+++ b/frontend/src/i18n/locales/zh.ts
@@ -153,6 +153,7 @@ export default {
     todayExpires: '(今日到期)',
     daysLeft: '({days} 天)',
     usedQuota: '已用额度',
+    resetNow: '即将重置',
     subscriptionType: '订阅类型',
     subscriptionExpires: '订阅到期',
     // Usage stat cells
@@ -665,6 +666,7 @@ export default {
     resetRateLimitConfirmMessage: '确定要重置密钥 "{name}" 的速率限制用量吗？所有时间窗口的已用额度将归零。此操作不可撤销。',
     rateLimitResetSuccess: '速率限制已重置',
     failedToResetRateLimit: '重置速率限制失败',
+    resetNow: '即将重置',
     expiration: '密钥有效期',
     expiresInDays: '{days} 天',
     extendDays: '+{days} 天',
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index 249ae652..6f1987c2 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -441,6 +441,9 @@ export interface ApiKey {
   window_5h_start: string | null
   window_1d_start: string | null
   window_7d_start: string | null
+  reset_5h_at: string | null
+  reset_1d_at: string | null
+  reset_7d_at: string | null
 }
 
 export interface CreateApiKeyRequest {
diff --git a/frontend/src/views/KeyUsageView.vue b/frontend/src/views/KeyUsageView.vue
index 755f1966..21a35340 100644
--- a/frontend/src/views/KeyUsageView.vue
+++ b/frontend/src/views/KeyUsageView.vue
@@ -226,6 +226,9 @@
                         class="text-sm font-semibold mt-1 tabular-nums"
                         :style="{ color: RING_GRADIENTS[i % 4].from }"
                       >{{ ring.amount }}</span>
+                      <p v-if="ring.resetAt && formatResetTime(ring.resetAt)" class="text-xs text-gray-400 dark:text-gray-500 mt-0.5 tabular-nums">
+                        ⟳ {{ formatResetTime(ring.resetAt) }}
+                      </p>
                     </template>
                   </div>
                 </div>
@@ -358,7 +361,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed, onMounted, nextTick } from 'vue'
+import { ref, computed, onMounted, onUnmounted, nextTick } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useAppStore } from '@/stores'
 import LocaleSwitcher from '@/components/common/LocaleSwitcher.vue'
@@ -396,6 +399,8 @@ const showLoading = ref(false)
 const showDatePicker = ref(false)
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 const resultData = ref<any>(null)
+const now = ref(new Date())
+let resetTimer: ReturnType<typeof setInterval> | null = null
 
 // ==================== Date Range State ====================
 
@@ -461,6 +466,7 @@ interface RingItem {
   amount: string
   isBalance?: boolean
   iconType: 'clock' | 'calendar' | 'dollar'
+  resetAt?: string | null
 }
 
 function getRingOffset(ring: RingItem): number {
@@ -544,6 +550,7 @@ const ringItems = computed<RingItem[]>(() => {
           pct,
           amount: `${usd(rl.used)} / ${usd(rl.limit)}`,
           iconType: windowIcons[rl.window] || 'clock',
+          resetAt: rl.reset_at,
         })
       }
     }
@@ -627,10 +634,15 @@ const detailRows = computed<DetailRow[]>(() => {
       const windowMap: Record<string, string> = { '5h': '5H', '1d': locale.value === 'zh' ? '日' : 'D', '7d': '7D' }
       for (const rl of data.rate_limits) {
         const pct = rl.limit > 0 ? (rl.used / rl.limit) * 100 : 0
+        let valueStr = `${usd(rl.used)} / ${usd(rl.limit)}`
+        const resetStr = formatResetTime(rl.reset_at)
+        if (resetStr) {
+          valueStr += ` (⟳ ${resetStr})`
+        }
         rows.push({
           iconBg: 'bg-primary-500/10', iconColor: 'text-primary-500', iconSvg: ICON_DOLLAR,
           label: `${t('keyUsage.usedQuota')} (${windowMap[rl.window] || rl.window})`,
-          value: `${usd(rl.used)} / ${usd(rl.limit)}`,
+          value: valueStr,
           valueClass: getUsageColor(pct),
         })
       }
@@ -798,11 +810,28 @@ function initTheme() {
   }
 }
 
+function formatResetTime(resetAt: string | null | undefined): string {
+  if (!resetAt) return ''
+  const diff = new Date(resetAt).getTime() - now.value.getTime()
+  if (diff <= 0) return t('keyUsage.resetNow')
+  const days = Math.floor(diff / 86400000)
+  const hours = Math.floor((diff % 86400000) / 3600000)
+  const mins = Math.floor((diff % 3600000) / 60000)
+  if (days > 0) return `${days}d ${hours}h`
+  if (hours > 0) return `${hours}h ${mins}m`
+  return `${mins}m`
+}
+
 onMounted(() => {
   initTheme()
   if (!appStore.publicSettingsLoaded) {
     appStore.fetchPublicSettings()
   }
+  resetTimer = setInterval(() => { now.value = new Date() }, 60000)
+})
+
+onUnmounted(() => {
+  if (resetTimer) clearInterval(resetTimer)
 })
 </script>
 
diff --git a/frontend/src/views/user/KeysView.vue b/frontend/src/views/user/KeysView.vue
index 8ffd6522..3068cb7f 100644
--- a/frontend/src/views/user/KeysView.vue
+++ b/frontend/src/views/user/KeysView.vue
@@ -187,6 +187,9 @@
                     :style="{ width: Math.min((row.usage_5h / row.rate_limit_5h) * 100, 100) + '%' }"
                   />
                 </div>
+                <div v-if="row.reset_5h_at && formatResetTime(row.reset_5h_at)" class="text-[10px] text-gray-400 dark:text-gray-500 tabular-nums">
+                  ⟳ {{ formatResetTime(row.reset_5h_at) }}
+                </div>
               </div>
               <!-- 1d window -->
               <div v-if="row.rate_limit_1d > 0">
@@ -212,6 +215,9 @@
                     :style="{ width: Math.min((row.usage_1d / row.rate_limit_1d) * 100, 100) + '%' }"
                   />
                 </div>
+                <div v-if="row.reset_1d_at && formatResetTime(row.reset_1d_at)" class="text-[10px] text-gray-400 dark:text-gray-500 tabular-nums">
+                  ⟳ {{ formatResetTime(row.reset_1d_at) }}
+                </div>
               </div>
               <!-- 7d window -->
               <div v-if="row.rate_limit_7d > 0">
@@ -237,6 +243,9 @@
                     :style="{ width: Math.min((row.usage_7d / row.rate_limit_7d) * 100, 100) + '%' }"
                   />
                 </div>
+                <div v-if="row.reset_7d_at && formatResetTime(row.reset_7d_at)" class="text-[10px] text-gray-400 dark:text-gray-500 tabular-nums">
+                  ⟳ {{ formatResetTime(row.reset_7d_at) }}
+                </div>
               </div>
               <!-- Reset button -->
               <button
@@ -1085,6 +1094,8 @@ const apiKeys = ref<ApiKey[]>([])
 const groups = ref<Group[]>([])
 const loading = ref(false)
 const submitting = ref(false)
+const now = ref(new Date())
+let resetTimer: ReturnType<typeof setInterval> | null = null
 const usageStats = ref<Record<string, BatchApiKeyUsageStats>>({})
 const userGroupRates = ref<Record<number, number>>({})
 
@@ -1745,15 +1756,29 @@ const closeCcsClientSelect = () => {
   pendingCcsRow.value = null
 }
 
+function formatResetTime(resetAt: string | null): string {
+  if (!resetAt) return ''
+  const diff = new Date(resetAt).getTime() - now.value.getTime()
+  if (diff <= 0) return t('keys.resetNow')
+  const days = Math.floor(diff / 86400000)
+  const hours = Math.floor((diff % 86400000) / 3600000)
+  const mins = Math.floor((diff % 3600000) / 60000)
+  if (days > 0) return `${days}d ${hours}h`
+  if (hours > 0) return `${hours}h ${mins}m`
+  return `${mins}m`
+}
+
 onMounted(() => {
   loadApiKeys()
   loadGroups()
   loadUserGroupRates()
   loadPublicSettings()
   document.addEventListener('click', closeGroupSelector)
+  resetTimer = setInterval(() => { now.value = new Date() }, 60000)
 })
 
 onUnmounted(() => {
   document.removeEventListener('click', closeGroupSelector)
+  if (resetTimer) clearInterval(resetTimer)
 })
 </script>