diff --git a/CHANGELOG.md b/CHANGELOG.md
index b9f926af..19c512b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -128,6 +128,8 @@
 - 쪽 수 추정(실험, `estimate_pages`)이 run의 `hp:switch` 안에 든 개체(차트와 그것을 대신하는 OLE 개체 등)가 있는 구역을
   지원 밖으로 둔다(`an object in a switch (hp:switch)`). 한/글은 그런 개체도 자리를 차지해 곁의 줄을 좁히는데, 전에는
   개체가 없는 것처럼 추정했다.
+- FormFit과 쪽 수 추정이 묶음 빈칸(`hp:nbSpace`)에 장평만 적용하고 자간은 적용하지 않는다. 한/글이 그렇게 놓는다(9pt
+  장평 120 %·자간 −12 %에서 536, 전에는 472). 공백과 고정폭 빈칸은 전과 같다.
 - FormFit과 쪽 수 추정에서 `!`의 반 em을 공백처럼 배치 단위(1/1800인치)로 내림한다. 9·11·13pt처럼 글자 크기의 4분의 1이
   홀수인 크기에서 `!`가 4 넓게 잡혀, 그 뒤 탭 폭이 한/글보다 4 좁았다.
 - FormFit과 쪽 수 추정이 공백 뒤의 닫는 문장부호(`!`·`?`·`)`·`%`·`」`·`·` 등 줄 머리에 오지 않는 문자 모두)로 줄을
diff --git a/src/hwpx/form_fit/measure.py b/src/hwpx/form_fit/measure.py
index 8646eb7b..479076b7 100644
--- a/src/hwpx/form_fit/measure.py
+++ b/src/hwpx/form_fit/measure.py
@@ -1269,7 +1269,8 @@ class TextStyle:
     the Hangul script's; ``scripts`` holds ``(script, 장평, 자간)`` for the
     Latin, symbol and Hanja scripts when the character shape gives them values
     of their own, and each glyph takes its script's (see :func:`glyph_script`).
-    A space keeps the Hangul 장평 and takes the Latin 자간.
+    A space keeps the Hangul 장평 and takes the Latin 자간; a no-break space
+    takes the 장평 and no 자간.
     ``break_non_latin_word`` works the reverse of its name in Hancom:
     ``BREAK_WORD`` (the default) keeps Hangul words whole and ``KEEP_WORD``
     breaks between any two syllables; ``break_latin_word`` works as named.
@@ -1499,7 +1500,8 @@ def char_advance(ch: str, font_pt: float, style: TextStyle | None = None) -> flo
         return float(height // _LAYOUT_UNIT // 4 * _LAYOUT_UNIT)
     ratio, spacing = _scaling(ch, style)
     if ch in _HALF_EM_SPACES and not style.use_font_space:
-        return _laid_out_space(height, ratio, spacing)
+        # a no-break space takes its 장평 but no 자간
+        return _laid_out_space(height, ratio, 0.0 if ch == " " else spacing)
     face = style.hangul_face if cls == "hangul" else style.glyph_face
     if emoji:
         design, base = _EMOJI_UNITS, _ADVANCE_EM[cls]
diff --git a/tests/fixtures/hancom_saved/formfit_space_scaling.hwpx b/tests/fixtures/hancom_saved/formfit_space_scaling.hwpx
new file mode 100644
index 00000000..40aa9015
Binary files /dev/null and b/tests/fixtures/hancom_saved/formfit_space_scaling.hwpx differ
diff --git a/tests/test_form_fit_hancom_rules.py b/tests/test_form_fit_hancom_rules.py
index 04df723a..a255ac14 100644
--- a/tests/test_form_fit_hancom_rules.py
+++ b/tests/test_form_fit_hancom_rules.py
@@ -20,6 +20,7 @@
 import pytest
 
 from hwpx.document import HwpxDocument
+from hwpx.layout import pages as page_layout
 from hwpx.form_fit import (
     FitEngine,
     FitPolicy,
@@ -58,6 +59,7 @@
 PARAGRAPH_MARGINS = Path(__file__).parent / "fixtures" / "hancom_saved" / "formfit_paragraph_margins.hwpx"
 PARAGRAPH_SPACING = Path(__file__).parent / "fixtures" / "hancom_saved" / "formfit_paragraph_spacing.hwpx"
 BOLD_ADVANCES = Path(__file__).parent / "fixtures" / "hancom_saved" / "formfit_bold_advances.hwpx"
+SPACE_SCALING = Path(__file__).parent / "fixtures" / "hancom_saved" / "formfit_space_scaling.hwpx"
 
 CHARS = TextStyle(break_non_latin_word="KEEP_WORD")  # Hancom 글자 단위
 SPACE_RUNS = Path(__file__).parent / "fixtures" / "hancom_saved" / "formfit_space_runs.hwpx"
@@ -417,6 +419,23 @@ def test_bold_glyphs_take_the_advances_hancom_lays_them_out_at() -> None:
     assert bold_seen
 
 
+def test_a_no_break_space_takes_its_ratio_and_no_spacing() -> None:
+    # Hancom laid "가", three no-break spaces (hp:nbSpace), fixed-width spaces or spaces and a tab out at 9, 10
+    # and 14 pt in 맑은 고딕 under several 장평 and 자간: the tab's width shows how wide the spaces are. A
+    # no-break space takes the 장평 but no 자간 (at 120 % and -12 % a 9 pt one is 536, not 472).
+    assert char_advance(" ", 9, TextStyle(ratio=120, spacing=-12)) == 536
+    assert char_advance(" ", 9, TextStyle(ratio=120, spacing=-12)) == 472
+    document = HwpxDocument.open(SPACE_SCALING)
+    for paragraph in document.oxml.sections[0].element.findall(f"{HP}p")[1:]:
+        runs = paragraph.findall(f"{HP}run")
+        ref = runs[0].get("charPrIDRef")
+        style = text_style_from_refs(document, paragraph.get("paraPrIDRef"), [ref])
+        size = int(document.oxml.char_property(ref).attributes["height"]) / 100
+        text = page_layout._run_text(runs)
+        x = sum(char_advance(ch, size, style) for ch in text[:text.index("	")])
+        assert round((x // 4000 + 1) * 4000 - x) == int(paragraph.find(f".//{HP}tab").get("width"))
+
+
 def test_a_hangul_syllable_takes_its_own_advance_where_the_font_gives_it_one() -> None:
     # 한컴 말랑말랑 Regular's font draws the syllables with a horizontal vowel (ㅗ ㅛ ㅜ ㅠ ㅡ) 820 of 1000 units
     # wide and the others 880; the faces whose syllables are all one width keep it.