diff --git a/src/town_gui.cpp b/src/town_gui.cpp
--- a/src/town_gui.cpp
+++ b/src/town_gui.cpp
@@ -392,7 +392,7 @@ public:
 		}
 
 		if (HasBit(this->town->flags, TOWN_IS_GROWING)) {
-			SetDParam(0, ((this->town->growth_rate & (~TOWN_GROW_RATE_CUSTOM)) * TOWN_GROWTH_TICKS + DAY_TICKS) / DAY_TICKS);
+			SetDParam(0, RoundDivSU(this->town->growth_rate + 1, DAY_TICKS));
 			DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_LEFT, y += FONT_HEIGHT_NORMAL, this->town->fund_buildings_months == 0 ? STR_TOWN_VIEW_TOWN_GROWS_EVERY : STR_TOWN_VIEW_TOWN_GROWS_EVERY_FUNDED);
 		} else {
 			DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_LEFT, y += FONT_HEIGHT_NORMAL, STR_TOWN_VIEW_TOWN_GROW_STOPPED);