diff --git a/src/autoreplace_gui.cpp b/src/autoreplace_gui.cpp
index 891e9febc6..db58477657 100644
--- a/src/autoreplace_gui.cpp
+++ b/src/autoreplace_gui.cpp
@@ -369,9 +369,7 @@ public:
 
 			case WID_RV_START_REPLACE: {
 				Dimension d = GetStringBoundingBox(STR_REPLACE_VEHICLES_START);
-				for (int i = 0; _start_replace_dropdown[i] != INVALID_STRING_ID; i++) {
-					d = maxdim(d, GetStringBoundingBox(_start_replace_dropdown[i]));
-				}
+				maxdim(d, GetStringListBoundingBox(_start_replace_dropdown));
 				d.width += padding.width;
 				d.height += padding.height;
 				size = maxdim(size, d);
diff --git a/src/bridge_gui.cpp b/src/bridge_gui.cpp
index c983433b7f..9683b59d33 100644
--- a/src/bridge_gui.cpp
+++ b/src/bridge_gui.cpp
@@ -190,10 +190,7 @@ public:
 				break;
 			}
 			case WID_BBS_DROPDOWN_CRITERIA: {
-				Dimension d = {0, 0};
-				for (const StringID *str = BuildBridgeWindow::sorter_names; *str != INVALID_STRING_ID; str++) {
-					d = maxdim(d, GetStringBoundingBox(*str));
-				}
+				Dimension d = GetStringListBoundingBox(BuildBridgeWindow::sorter_names);
 				d.width += padding.width;
 				d.height += padding.height;
 				size = maxdim(size, d);
diff --git a/src/genworld_gui.cpp b/src/genworld_gui.cpp
index 5cd4112061..4ac2bbae36 100644
--- a/src/genworld_gui.cpp
+++ b/src/genworld_gui.cpp
@@ -574,7 +574,7 @@ struct GenerateLandscapeWindow : public Window {
 	void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
 	{
 		Dimension d{0, (uint)GetCharacterHeight(FS_NORMAL)};
-		const StringID *strs = nullptr;
+		std::span<const StringID> strs;
 		switch (widget) {
 			case WID_GL_TEMPERATE: case WID_GL_ARCTIC:
 			case WID_GL_TROPICAL: case WID_GL_TOYLAND:
@@ -660,11 +660,7 @@ struct GenerateLandscapeWindow : public Window {
 			default:
 				return;
 		}
-		if (strs != nullptr) {
-			while (*strs != INVALID_STRING_ID) {
-				d = maxdim(d, GetStringBoundingBox(*strs++));
-			}
-		}
+		maxdim(d, GetStringListBoundingBox(strs));
 		d.width += padding.width;
 		d.height += padding.height;
 		size = maxdim(size, d);
diff --git a/src/gfx.cpp b/src/gfx.cpp
index b3bdc79998..64bfc4a807 100644
--- a/src/gfx.cpp
+++ b/src/gfx.cpp
@@ -22,6 +22,7 @@
 #include "newgrf_debug.h"
 #include "core/backup_type.hpp"
 #include "core/container_func.hpp"
+#include "core/geometry_func.hpp"
 #include "viewport_func.h"
 
 #include "table/string_colours.h"
@@ -877,6 +878,21 @@ uint GetStringListWidth(std::span<const StringID> list, FontSize fontsize)
 	return width;
 }
 
+/**
+ * Get maximum dimension of a list of strings.
+ * @param list List of strings, terminated by INVALID_STRING_ID.
+ * @param fontsize Font size to use.
+ * @return Dimension of highest and longest string within the list.
+ */
+Dimension GetStringListBoundingBox(std::span<const StringID> list, FontSize fontsize)
+{
+	Dimension d{0, 0};
+	for (const StringID *str = list.data(); *str != INVALID_STRING_ID; str++) {
+		d = maxdim(d, GetStringBoundingBox(*str, fontsize));
+	}
+	return d;
+}
+
 /**
  * Get the leading corner of a character in a single-line string relative
  * to the start of the string.
diff --git a/src/gfx_func.h b/src/gfx_func.h
index 592bcc5a8d..c6c1a46a4c 100644
--- a/src/gfx_func.h
+++ b/src/gfx_func.h
@@ -134,6 +134,7 @@ inline void GfxFillRect(const Rect &r, int colour, FillRectMode mode = FILLRECT_
 Dimension GetStringBoundingBox(std::string_view str, FontSize start_fontsize = FS_NORMAL);
 Dimension GetStringBoundingBox(StringID strid, FontSize start_fontsize = FS_NORMAL);
 uint GetStringListWidth(std::span<const StringID> list, FontSize fontsize = FS_NORMAL);
+Dimension GetStringListBoundingBox(std::span<const StringID> list, FontSize fontsize = FS_NORMAL);
 int GetStringHeight(std::string_view str, int maxw, FontSize fontsize = FS_NORMAL);
 int GetStringHeight(StringID str, int maxw);
 int GetStringLineCount(StringID str, int maxw);
diff --git a/src/industry_gui.cpp b/src/industry_gui.cpp
index ebde5b921d..863789f250 100644
--- a/src/industry_gui.cpp
+++ b/src/industry_gui.cpp
@@ -1739,10 +1739,7 @@ public:
 			}
 
 			case WID_ID_DROPDOWN_CRITERIA: {
-				Dimension d = {0, 0};
-				for (uint i = 0; IndustryDirectoryWindow::sorter_names[i] != INVALID_STRING_ID; i++) {
-					d = maxdim(d, GetStringBoundingBox(IndustryDirectoryWindow::sorter_names[i]));
-				}
+				Dimension d = GetStringListBoundingBox(IndustryDirectoryWindow::sorter_names);
 				d.width += padding.width;
 				d.height += padding.height;
 				size = maxdim(size, d);
diff --git a/src/order_gui.cpp b/src/order_gui.cpp
index 397502cd32..06fb5318af 100644
--- a/src/order_gui.cpp
+++ b/src/order_gui.cpp
@@ -854,10 +854,7 @@ public:
 			}
 
 			case WID_O_COND_COMPARATOR: {
-				Dimension d = {0, 0};
-				for (int i = 0; _order_conditional_condition[i] != INVALID_STRING_ID; i++) {
-					d = maxdim(d, GetStringBoundingBox(_order_conditional_condition[i]));
-				}
+				Dimension d = GetStringListBoundingBox(_order_conditional_condition);
 				d.width += padding.width;
 				d.height += padding.height;
 				size = maxdim(size, d);
diff --git a/src/station_gui.cpp b/src/station_gui.cpp
index d3b04b2749..d538fa33a2 100644
--- a/src/station_gui.cpp
+++ b/src/station_gui.cpp
@@ -430,10 +430,7 @@ public:
 			}
 
 			case WID_STL_SORTDROPBTN: {
-				Dimension d = {0, 0};
-				for (int i = 0; CompanyStationsWindow::sorter_names[i] != INVALID_STRING_ID; i++) {
-					d = maxdim(d, GetStringBoundingBox(CompanyStationsWindow::sorter_names[i]));
-				}
+				Dimension d = GetStringListBoundingBox(CompanyStationsWindow::sorter_names);
 				d.width += padding.width;
 				d.height += padding.height;
 				size = maxdim(size, d);
diff --git a/src/town_gui.cpp b/src/town_gui.cpp
index 8e38d7c1d1..e030111cdb 100644
--- a/src/town_gui.cpp
+++ b/src/town_gui.cpp
@@ -894,10 +894,7 @@ public:
 				break;
 			}
 			case WID_TD_SORT_CRITERIA: {
-				Dimension d = {0, 0};
-				for (uint i = 0; TownDirectoryWindow::sorter_names[i] != INVALID_STRING_ID; i++) {
-					d = maxdim(d, GetStringBoundingBox(TownDirectoryWindow::sorter_names[i]));
-				}
+				Dimension d = GetStringListBoundingBox(TownDirectoryWindow::sorter_names);
 				d.width += padding.width;
 				d.height += padding.height;
 				size = maxdim(size, d);
diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
index 6d85048134..2b7e9c00ff 100644
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -2487,12 +2487,7 @@ struct VehicleDetailsWindow : Window {
 				break;
 
 			case WID_VD_SERVICE_INTERVAL_DROPDOWN: {
-				Dimension d{0, 0};
-				for (const StringID *strs : {_service_interval_dropdown_calendar, _service_interval_dropdown_wallclock}) {
-					while (*strs != INVALID_STRING_ID) {
-						d = maxdim(d, GetStringBoundingBox(*strs++));
-					}
-				}
+				Dimension d = maxdim(GetStringListBoundingBox(_service_interval_dropdown_calendar), GetStringListBoundingBox(_service_interval_dropdown_wallclock));
 				d.width += padding.width;
 				d.height += padding.height;
 				size = maxdim(size, d);