diff --git a/CHANGELOG.md b/CHANGELOG.md
index 671fb78b..b415d051 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -56,6 +56,11 @@
 * Foot now sends `SIGTERM`/`SIGKILL` to the client application’s process group,
   instead of just to the client application’s process.
 * `kmous` terminfo capability from `\E[M` to `\E[<`.
+* pt-or-px values (`letter-spacing`, etc) and the line thickness
+  (`tweak.box-drawing-base-thickness`) in box drawing characters are
+  now translated to pixel values using the monitor’s scaling factor
+  when `dpi-aware=no`, or `dpi-aware=auto` and the scaling factor is
+  larger than 1 (https://codeberg.org/dnkl/foot/issues/680).
 
 
 ### Deprecated
diff --git a/box-drawing.c b/box-drawing.c
index 62716106..f246fd01 100644
--- a/box-drawing.c
+++ b/box-drawing.c
@@ -25,9 +25,6 @@ struct buf {
     int width;
     int height;
     int stride;
-    int dpi;
-    float cell_size;
-    float base_thickness;
     bool solid_shades;
 
     int thickness[2];
@@ -63,17 +60,15 @@ change_buffer_format(struct buf *buf, pixman_format_code_t new_format)
 }
 
 static int NOINLINE
-_thickness(struct buf *buf, enum thickness thick)
+_thickness(int base_thickness, enum thickness thick)
 {
     int multiplier = thick * 2 + 1;
 
+    xassert(base_thickness >= 1);
     xassert((thick == LIGHT && multiplier == 1) ||
             (thick == HEAVY && multiplier == 3));
 
-    return
-        max(
-            (int)(buf->base_thickness * buf->dpi / 72.0 * buf->cell_size), 1)
-        * multiplier;
+    return base_thickness * multiplier;
 }
 #define thickness(thick) buf->thickness[thick]
 
@@ -2751,25 +2746,13 @@ box_drawing(const struct terminal *term, wchar_t wc)
         abort();
     }
 
-    struct buf buf = {
-        .data = data,
-        .pix = pix,
-        .format = fmt,
-        .width = width,
-        .height = height,
-        .stride = stride,
-        .dpi = term->font_dpi,
-        .cell_size = sqrt(pow(term->cell_width, 2) + pow(term->cell_height, 2)),
-        .base_thickness = term->conf->tweak.box_drawing_base_thickness,
-        .solid_shades = term->conf->tweak.box_drawing_solid_shades,
-    };
+    double dpi = term_font_sized_by_dpi(term, term->scale) ? term->font_dpi : 96.;
+    double scale = term_font_sized_by_scale(term, term->scale) ? term->scale : 1.;
+    double cell_size = sqrt(pow(term->cell_width, 2) + pow(term->cell_height, 2));
 
-    buf.thickness[LIGHT] = _thickness(&buf, LIGHT);
-    buf.thickness[HEAVY] = _thickness(&buf, HEAVY);
-
-    /* Overlap when width is odd */
-    buf.x_halfs[0] = round(width / 2.); /* Endpoint first half */
-    buf.x_halfs[1] = width / 2;         /* Startpoint second half */
+    int base_thickness =
+        (double)term->conf->tweak.box_drawing_base_thickness * scale * cell_size * dpi / 72.0;
+    base_thickness = max(base_thickness, 1);
 
     int y0 = 0, y1 = 0;
     switch (height % 3) {
@@ -2789,8 +2772,31 @@ box_drawing(const struct terminal *term, wchar_t wc)
         break;
     }
 
-    buf.y_thirds[0] = y0;  /* Endpoint first third, start point second third */
-    buf.y_thirds[1] = y1;  /* Endpoint second third, start point last third */
+    struct buf buf = {
+        .data = data,
+        .pix = pix,
+        .format = fmt,
+        .width = width,
+        .height = height,
+        .stride = stride,
+        .solid_shades = term->conf->tweak.box_drawing_solid_shades,
+
+        .thickness = {
+            [LIGHT] = _thickness(base_thickness, LIGHT),
+            [HEAVY] = _thickness(base_thickness, HEAVY),
+        },
+
+        /* Overlap when width is odd */
+        .x_halfs = {
+            round(width / 2.), /* Endpoint first half */
+            width / 2,         /* Startpoint second half */
+        },
+
+        .y_thirds = {
+            y0,  /* Endpoint first third, start point second third */
+            y1,  /* Endpoint second third, start point last third */
+        },
+    };
 
     LOG_DBG("LIGHT=%d, HEAVY=%d",
             _thickness(&buf, LIGHT), _thickness(&buf, HEAVY));
diff --git a/terminal.c b/terminal.c
index de397ec1..2be92dda 100644
--- a/terminal.c
+++ b/terminal.c
@@ -627,15 +627,6 @@ err_sem_destroy:
     return false;
 }
 
-int
-term_pt_or_px_as_pixels(const struct terminal *term,
-                        const struct pt_or_px *pt_or_px)
-{
-    return pt_or_px->px == 0
-        ? round(pt_or_px->pt * term->font_dpi / 72)
-        : pt_or_px->px;
-}
-
 static void
 free_box_drawing(struct fcft_glyph **box_drawing)
 {
@@ -802,19 +793,30 @@ get_font_subpixel(const struct terminal *term)
     return FCFT_SUBPIXEL_DEFAULT;
 }
 
-static bool
-font_sized_by_dpi(const struct terminal *term, int scale)
+bool
+term_font_sized_by_dpi(const struct terminal *term, int scale)
 {
     return term->conf->dpi_aware == DPI_AWARE_YES ||
         (term->conf->dpi_aware == DPI_AWARE_AUTO && scale <= 1);
 }
 
-static bool
-font_sized_by_scale(const struct terminal *term, int scale)
+bool
+term_font_sized_by_scale(const struct terminal *term, int scale)
 {
-    return !font_sized_by_dpi(term, scale);
+    return !term_font_sized_by_dpi(term, scale);
 }
 
+int
+term_pt_or_px_as_pixels(const struct terminal *term,
+                        const struct pt_or_px *pt_or_px)
+{
+    double scale = term_font_sized_by_scale(term, term->scale) ? term->scale : 1.;
+    double dpi = term_font_sized_by_dpi(term, term->scale) ? term->font_dpi : 96.;
+
+    return pt_or_px->px == 0
+        ? round(pt_or_px->pt * scale * dpi / 72)
+        : pt_or_px->px;
+}
 
 struct font_load_data {
     size_t count;
@@ -857,7 +859,7 @@ reload_fonts(struct terminal *term)
             char size[64];
 
             const int scale =
-                font_sized_by_scale(term, term->scale) ? term->scale : 1;
+                term_font_sized_by_scale(term, term->scale) ? term->scale : 1;
 
             if (use_px_size)
                 snprintf(size, sizeof(size), ":pixelsize=%d",
@@ -892,7 +894,7 @@ reload_fonts(struct terminal *term)
     const size_t count_bold_italic = custom_bold_italic ? counts[3] : counts[0];
     const char **names_bold_italic = (const char **)(custom_bold_italic ? names[3] : names[0]);
 
-    const bool use_dpi = font_sized_by_dpi(term, term->scale);
+    const bool use_dpi = term_font_sized_by_dpi(term, term->scale);
 
     char *attrs[4] = {NULL};
     int attr_len[4] = {-1, -1, -1, -1};  /* -1, so that +1 (below) results in 0 */
@@ -1981,8 +1983,8 @@ term_font_dpi_changed(struct terminal *term, int old_scale)
     float dpi = get_font_dpi(term);
     xassert(term->scale > 0);
 
-    bool was_scaled_using_dpi = font_sized_by_dpi(term, old_scale);
-    bool will_scale_using_dpi = font_sized_by_dpi(term, term->scale);
+    bool was_scaled_using_dpi = term_font_sized_by_dpi(term, old_scale);
+    bool will_scale_using_dpi = term_font_sized_by_dpi(term, term->scale);
 
     bool need_font_reload =
         was_scaled_using_dpi != will_scale_using_dpi ||
diff --git a/terminal.h b/terminal.h
index 74a8f2de..f394a5b0 100644
--- a/terminal.h
+++ b/terminal.h
@@ -643,6 +643,9 @@ bool term_font_size_decrease(struct terminal *term);
 bool term_font_size_reset(struct terminal *term);
 bool term_font_dpi_changed(struct terminal *term, int old_scale);
 void term_font_subpixel_changed(struct terminal *term);
+
+bool term_font_sized_by_dpi(const struct terminal *term, int scale);
+bool term_font_sized_by_scale(const struct terminal *term, int scale);
 int term_pt_or_px_as_pixels(
     const struct terminal *term, const struct pt_or_px *pt_or_px);