diff --git a/esphome/components/libretiny/__init__.py b/esphome/components/libretiny/__init__.py
index 02c4aad03d..6bba2e20f0 100644
--- a/esphome/components/libretiny/__init__.py
+++ b/esphome/components/libretiny/__init__.py
@@ -292,6 +292,7 @@ def _configure_lwip(config: dict) -> None:
     TCP_SND_BUF               2×MSS   4×MSS  10×MSS   5×MSS    7×MSS    4×MSS
     TCP_WND                   4×MSS   4×MSS  10×MSS   2×MSS    3×MSS    4×MSS
     MEM_SIZE                  1.6KB   N/A*   32KB     5KB      N/A*     5KB BK
+    PBUF_POOL_SIZE            10      16     3/10     20       20       10 BK
     MAX_SOCKETS_TCP           5       16     12       —**      —**      dynamic
     MAX_SOCKETS_UDP           4       16     22       —**      —**      dynamic
     TCP_SND_QUEUELEN          ~8      17     20       20       35       17
@@ -373,11 +374,11 @@ def _configure_lwip(config: dict) -> None:
     # LN882H uses MEM_LIBC_MALLOC=1 (system heap), so MEM_SIZE is irrelevant.
     if CORE.is_bk72xx:
         lwip_opts.append("MEM_SIZE=5120")  # BK SDK: 32,768, RTL SDK: 5,120
-        # PBUF_POOL_SIZE: BK SDK "reduced plan" sets this to only 3, which is
-        # too small for TCP_WND=4×MSS (5840 > 3*1526=4578). Set to 4 so the
-        # lwIP sanity check passes: 4*1526=6104 > 5840.
-        # RTL(20) and LN(20) are already large enough.
-        lwip_opts.append("PBUF_POOL_SIZE=4")
+        # PBUF_POOL_SIZE: BK SDK "reduced plan" sets this to only 3 — too few
+        # for multiple concurrent connections (API + web_server + OTA).
+        # BK default plan uses 10; match that. RTL(20) and LN(20) need no override.
+        # Cost: 10 × 1580 = 15.8KB static RAM (vs 3 × 1580 = 4.7KB before).
+        lwip_opts.append("PBUF_POOL_SIZE=10")
 
     cg.add_platformio_option("custom_options.lwip", lwip_opts)