diff --git a/esphome/build_gen/espidf.py b/esphome/build_gen/espidf.py
index b1443edac31..dfe2d72b9de 100644
--- a/esphome/build_gen/espidf.py
+++ b/esphome/build_gen/espidf.py
@@ -89,6 +89,16 @@ include($ENV{{IDF_PATH}}/tools/cmake/project.cmake)
 {extra_compile_options}
 
 project({CORE.name})
+
+# Emit raw JSON size data for ESPHome to read post-build.
+add_custom_command(
+    TARGET ${{CMAKE_PROJECT_NAME}}.elf POST_BUILD
+    COMMAND ${{PYTHON}} -m esp_idf_size --ng --format=raw
+            -o ${{CMAKE_BINARY_DIR}}/esp_idf_size.json
+            ${{CMAKE_PROJECT_NAME}}.map
+    WORKING_DIRECTORY ${{CMAKE_BINARY_DIR}}
+    VERBATIM
+)
 """
 
 
diff --git a/esphome/espidf/runner.py b/esphome/espidf/runner.py
index 34e3e7694b5..65df37c7b24 100644
--- a/esphome/espidf/runner.py
+++ b/esphome/espidf/runner.py
@@ -57,6 +57,15 @@ FILTER_IDF_LINES: list[str] = [
     # line, so a NOTICE often arrives prefixed with ".NOTICE:" or
     # "...........NOTICE:".
     r"\.*NOTICE: ",
+    # ``idf.py size`` prefaces its table with a centered banner; the
+    # per-region table below already makes the structure obvious.
+    r"\s*Memory Type Usage Summary",
+    # Prefix match for esp-idf-size's trailing "Note:" paragraph (no
+    # upstream flag suppresses it).
+    r"Note: The reported total sizes may be smaller than those in the",
+    # Drop the blank line rich emits after the note so the build log
+    # doesn't end with an orphan gap before ESPHome's own status lines.
+    r"\s*$",
 ]
 
 
diff --git a/esphome/espidf/size_summary.py b/esphome/espidf/size_summary.py
new file mode 100644
index 00000000000..9477e664b34
--- /dev/null
+++ b/esphome/espidf/size_summary.py
@@ -0,0 +1,111 @@
+"""PlatformIO-format RAM/Flash one-liners after a native ESP-IDF build.
+
+``idf.py size`` (chained onto ``idf.py build`` in
+``toolchain.run_compile``) prints the per-region table inline as part
+of the build. This module adds two summary lines underneath,
+byte-identical to PlatformIO's output:
+
+    RAM:   [====      ]  26.5% (used 47932 bytes from 180736 bytes)
+    Flash: [===       ]  48.4% (used 888511 bytes from 1835008 bytes)
+
+The format matches ``script/ci_memory_impact_extract.py`` so CI memory
+analysis works unchanged on native ESP-IDF builds. RAM total is the
+DRAM region size from the linker map; Flash total is taken from
+``partitions.csv`` using PlatformIO's rule (first app partition whose
+subtype is ``factory`` or ``ota_0``; see
+``platform-espressif32/builder/main.py::_update_max_upload_size``).
+
+Structured size data is produced at link time by a CMake POST_BUILD
+custom command (see ``build_gen/espidf.py``) which writes
+``esp_idf_size.json`` next to the ELF. We read that file here rather
+than re-running ``esp_idf_size`` from Python.
+"""
+
+from __future__ import annotations
+
+import csv
+import json
+import logging
+from pathlib import Path
+
+_LOGGER = logging.getLogger(__name__)
+_SIZE_SUFFIXES = {"K": 1024, "M": 1024 * 1024}
+
+
+def _parse_size(token: str) -> int:
+    token = token.strip()
+    if not token:
+        return 0
+    if token.startswith(("0x", "0X")):
+        return int(token, 16)
+    suffix = token[-1].upper()
+    if suffix in _SIZE_SUFFIXES:
+        return int(token[:-1]) * _SIZE_SUFFIXES[suffix]
+    return int(token)
+
+
+def _find_app_partition_size(partitions_csv: Path) -> int:
+    """Return the size of the firmware's app partition.
+
+    Mirrors PlatformIO's ``platform-espressif32/builder/main.py::
+    _update_max_upload_size``: take the first ``app``-type partition
+    whose subtype is ``factory`` or ``ota_0``. Order matters because
+    layouts like Adafruit's ``partitions-4MB-tinyuf2.csv`` repurpose
+    ``factory`` for a UF2 bootloader before the real OTA slot, so a
+    naive "prefer factory" rule would pick the wrong row. Raises
+    ``ValueError`` if no qualifying partition is present.
+    """
+    if not partitions_csv.is_file():
+        raise ValueError(f"partitions.csv not found at {partitions_csv}")
+    for row in csv.reader(partitions_csv.read_text().splitlines()):
+        cells = [c.strip() for c in row]
+        if not cells or cells[0].startswith("#") or len(cells) < 5:
+            continue
+        ptype, psubtype, psize = cells[1], cells[2], cells[4]
+        if ptype in ("app", "0") and psubtype in ("factory", "ota_0"):
+            return _parse_size(psize)
+    raise ValueError(f"No app+factory or app+ota_0 partition in {partitions_csv}")
+
+
+def _format_bar(used: int, total: int) -> str:
+    """Match PlatformIO's ``_format_availale_bytes`` (pioupload.py) exactly."""
+    pct_raw = used / total if total else 0
+    blocks = 10
+    filled = min(int(round(blocks * pct_raw)), blocks)
+    progress = "=" * filled
+    return (
+        f"[{progress:<{blocks}}] {pct_raw: 6.1%} "
+        f"(used {used:d} bytes from {total:d} bytes)"
+    )
+
+
+def print_summary(size_json: Path, partitions_csv: Path | None) -> None:
+    """Print PlatformIO-shaped RAM and Flash one-liners.
+
+    Failures are non-fatal: the build has already succeeded, we just couldn't
+    summarize. Logs the cause at debug level.
+    """
+    if not size_json.is_file():
+        _LOGGER.debug("Skipping size summary: %s not found", size_json)
+        return
+    try:
+        data = json.loads(size_json.read_text())
+    except (OSError, json.JSONDecodeError) as e:
+        _LOGGER.debug("Skipping size summary: %s", e)
+        return
+
+    dram = data.get("memory_types", {}).get("DRAM") or {}
+    ram_used = dram.get("used")
+    ram_total = dram.get("size")
+    if ram_total and ram_used is not None:
+        print(f"RAM:   {_format_bar(ram_used, ram_total)}")
+
+    image_size = data.get("image_size")
+    if image_size is None or partitions_csv is None:
+        return
+    try:
+        app_size = _find_app_partition_size(partitions_csv)
+    except ValueError as e:
+        _LOGGER.debug("Skipping Flash summary: %s", e)
+        return
+    print(f"Flash: {_format_bar(image_size, app_size)}")
diff --git a/esphome/espidf/toolchain.py b/esphome/espidf/toolchain.py
index da6d3a8a37f..ecb759ed10c 100644
--- a/esphome/espidf/toolchain.py
+++ b/esphome/espidf/toolchain.py
@@ -12,6 +12,7 @@ import subprocess
 from esphome.components.esp32.const import KEY_ESP32, KEY_FLASH_SIZE, KEY_IDF_VERSION
 from esphome.core import CORE, EsphomeError
 from esphome.espidf.framework import check_esp_idf_install, get_framework_env
+from esphome.espidf.size_summary import print_summary
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -341,8 +342,14 @@ def run_compile(config, verbose: bool) -> int:
 
     args.extend(_get_sdkconfig_args())
     args.append("build")
+    args.append("size")
 
-    return run_idf_py(*args)
+    rc = run_idf_py(*args)
+    if rc == 0:
+        size_json = CORE.relative_build_path("build", "esp_idf_size.json")
+        partitions = CORE.relative_build_path("partitions.csv")
+        print_summary(size_json, partitions if partitions.is_file() else None)
+    return rc
 
 
 def get_firmware_path() -> Path: