diff --git a/esphome/components/libretiny/__init__.py b/esphome/components/libretiny/__init__.py
index 6bba2e20f0..83f11cc8e5 100644
--- a/esphome/components/libretiny/__init__.py
+++ b/esphome/components/libretiny/__init__.py
@@ -291,7 +291,7 @@ 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
+    MEM_SIZE                  1.6KB   N/A*   16/32KB  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
@@ -373,7 +373,7 @@ def _configure_lwip(config: dict) -> None:
     # RTL87XX SDK default is 5KB (already reasonable).
     # 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
+        lwip_opts.append("MEM_SIZE=5120")  # BK SDK: 16,384/32,768, RTL SDK: 5,120
         # 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.