diff --git a/esphome/components/web_server/web_server.cpp b/esphome/components/web_server/web_server.cpp
index dea4851493..c2d7b08e59 100644
--- a/esphome/components/web_server/web_server.cpp
+++ b/esphome/components/web_server/web_server.cpp
@@ -386,6 +386,7 @@ json::SerializationBuffer<> WebServer::get_config_json() {
 #endif
   root[ESPHOME_F("log")] = this->expose_log_;
   root[ESPHOME_F("lang")] = "en";
+  root[ESPHOME_F("uptime")] = static_cast<uint32_t>(App.scheduler.millis_64() / 1000);
 
   return builder.serialize();
 }
@@ -412,7 +413,12 @@ void WebServer::setup() {
 
   // doesn't need defer functionality - if the queue is full, the client JS knows it's alive because it's clearly
   // getting a lot of events
-  this->set_interval(10000, [this]() { this->events_.try_send_nodefer("", "ping", millis(), 30000); });
+  this->set_interval(10000, [this]() {
+    char buf[32];
+    auto uptime = static_cast<uint32_t>(App.scheduler.millis_64() / 1000);
+    buf_append_printf(buf, sizeof(buf), 0, "{\"uptime\":%u}", uptime);
+    this->events_.try_send_nodefer(buf, "ping", millis(), 30000);
+  });
 }
 void WebServer::loop() { this->events_.loop(); }
 
diff --git a/esphome/core/scheduler.cpp b/esphome/core/scheduler.cpp
index b4227c55b6..36b65f6ff7 100644
--- a/esphome/core/scheduler.cpp
+++ b/esphome/core/scheduler.cpp
@@ -698,6 +698,8 @@ bool HOT Scheduler::cancel_item_locked_(Component *component, NameType name_type
   return total_cancelled > 0;
 }
 
+uint64_t Scheduler::millis_64() { return this->millis_64_(millis()); }
+
 uint64_t Scheduler::millis_64_(uint32_t now) {
   // THREAD SAFETY NOTE:
   // This function has three implementations, based on the precompiler flags
diff --git a/esphome/core/scheduler.h b/esphome/core/scheduler.h
index 2aaa901e46..719633bff1 100644
--- a/esphome/core/scheduler.h
+++ b/esphome/core/scheduler.h
@@ -116,6 +116,9 @@ class Scheduler {
   ESPDEPRECATED("cancel_retry is deprecated and will be removed in 2026.8.0.", "2026.2.0")
   bool cancel_retry(Component *component, uint32_t id);
 
+  /// Get 64-bit millisecond timestamp (handles 32-bit millis() rollover)
+  uint64_t millis_64();
+
   // Calculate when the next scheduled item should run
   // @param now Fresh timestamp from millis() - must not be stale/cached
   // Returns the time in milliseconds until the next scheduled item, or nullopt if no items