diff --git a/crates/calc/src/eval.rs b/crates/calc/src/eval.rs
index 7ce2483..47a5119 100644
--- a/crates/calc/src/eval.rs
+++ b/crates/calc/src/eval.rs
@@ -1368,7 +1368,7 @@ impl<'h> Evaluator<'h> {
                     _ => "v",
                 }))
             }
-            "width" => Ev::V(Value::number(sheet.map_or(8.43, |s| (s.col_width(c.col) as f64 / 7.0 * 100.0).round() / 100.0).round())),
+            "width" => Ev::V(Value::number(sheet.map_or(8.43, |s| gridcraft_model::points_to_chars(s.col_width(c.col) as f64)).round())),
             "filename" => Ev::V(Value::text(String::new())),
             "sheetname" => Ev::V(Value::text(sheet.map(|s| s.name.clone()).unwrap_or_default())),
             "protect" => Ev::V(Value::number(if sheet.is_some_and(|s| wb.styles.get(s.style_id(c)).protection.locked) { 1.0 } else { 0.0 })),
diff --git a/crates/calc/src/tests.rs b/crates/calc/src/tests.rs
index ee4c4bc..8b29f63 100644
--- a/crates/calc/src/tests.rs
+++ b/crates/calc/src/tests.rs
@@ -1121,6 +1121,19 @@ fn trim_references() {
     assert_eq!(t.get("K20"), Value::Error(CellError::Calc));
 }
 
+#[test]
+fn cell_width_is_the_column_width_dialog_value_rounded() {
+    // #735: Excel 365 values. Widths in px as `home.columnWidth {"chars"}` sets them
+    // (chars * 7 + 5): 10.71 -> 80, 12 -> 89, 10.57 -> 79, 2.86 -> 25; B keeps the default 8.43 (64).
+    let mut t = T::new();
+    let sh = t.wb.sheet_mut(0).unwrap();
+    for (col, px) in [(2, 80.0), (3, 89.0), (4, 79.0), (5, 25.0)] {
+        sh.cols.insert(col, gridcraft_model::LineInfo { size: Some(px), ..Default::default() });
+    }
+    for (at, col) in [("H1", "B"), ("H2", "C"), ("H3", "D"), ("H4", "E"), ("H5", "F")] {
+        t.set(at, &format!("=CELL(\"width\",{col}1)"));
+    }
+    assert_eq!([t.num("H1"), t.num("H2"), t.num("H3"), t.num("H4"), t.num("H5")], [8.0, 11.0, 12.0, 11.0, 3.0]);
 /// Expected results are Excel's, from Apache POI's `DGet.xls` (rows 46-49): a criteria cell holding
 /// a formula under a label that names no field is evaluated for every record.
 #[test]
diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index 61c9acb..c3c7fb4 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -1002,9 +1002,7 @@ pub fn chars_to_points(c: f64) -> f64 {
     }
 }
 
-pub fn points_to_chars(px: f64) -> f64 {
-    if px <= 12.0 { (px / 12.0 * 100.0).round() / 100.0 } else { ((px - 5.0) / 7.0 * 100.0 + 0.5).trunc() / 100.0 }
-}
+pub use gridcraft_model::points_to_chars;
 
 /// Approximate text width in points for autofit (no font metrics in the engine: average glyph
 /// widths for the default font; the UI refines with real measurement when it autofits).
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 1bea842..fa64aad 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -19,7 +19,7 @@ pub use cell::{Cell, CellPicture, Formula};
 pub use features::*;
 pub use password::PasswordHash;
 pub use preserved::{Preserved, PreservedPart, PreservedRel, PreservedXml};
-pub use sheet::{DEFAULT_COL_WIDTH, DEFAULT_ROW_HEIGHT, LineIndex, Sheet, SheetViewMode, Visibility};
+pub use sheet::{DEFAULT_COL_WIDTH, DEFAULT_ROW_HEIGHT, LineIndex, Sheet, SheetViewMode, Visibility, points_to_chars};
 pub use store::CellStore;
 pub use style::{
     Alignment, BorderLine, BorderStyle, Borders, Color, Fill, Font, HAlign, NumFmt, PatternType, Style, StyleId, StyleTable, Theme, Underline,
diff --git a/crates/model/src/sheet.rs b/crates/model/src/sheet.rs
index e05d3bf..b404b89 100644
--- a/crates/model/src/sheet.rs
+++ b/crates/model/src/sheet.rs
@@ -117,6 +117,12 @@ pub struct Sheet {
 pub const DEFAULT_COL_WIDTH: f32 = 64.0;
 pub const DEFAULT_ROW_HEIGHT: f32 = 20.0;
 
+/// Column width (points) → characters of the default font's digit width (7 px), without the
+/// cell padding: the value the Column Width dialog shows.
+pub fn points_to_chars(px: f64) -> f64 {
+    if px <= 12.0 { (px / 12.0 * 100.0).round() / 100.0 } else { ((px - 5.0) / 7.0 * 100.0 + 0.5).trunc() / 100.0 }
+}
+
 impl Sheet {
     pub fn new(name: impl Into<String>) -> Sheet {
         Sheet {