diff --git a/app/javascript/projects/analysis_panel_tools/subsection.ts b/app/javascript/projects/analysis_panel_tools/subsection.ts
index ca31a882..9b52449d 100644
--- a/app/javascript/projects/analysis_panel_tools/subsection.ts
+++ b/app/javascript/projects/analysis_panel_tools/subsection.ts
@@ -45,7 +45,7 @@ export function extentToChartData(colors: Color[] | undefined, model: BooleanTil
 
             if (model instanceof CategoricalTileGrid) {
 
-                const area = getArea(fromExtent(tileGrid.getTileCoordExtent([20, x, y]))) / 1000000
+                const area = getArea(fromExtent(tileGrid.getTileCoordExtent([model.zoom, x, y]))) / 1000000
 
                 const value = model.labels.get(model.get(x, y)) ? model.labels.get(model.get(x, y)) : "No Data"
                 const count = counts.get(value) || 0
@@ -58,7 +58,7 @@ export function extentToChartData(colors: Color[] | undefined, model: BooleanTil
 
             } else {
 
-                const area = model instanceof NumericTileGrid ? 1 : getArea(fromExtent(tileGrid.getTileCoordExtent([20, x, y]))) / 1000000
+                const area = model instanceof NumericTileGrid ? 1 : getArea(fromExtent(tileGrid.getTileCoordExtent([model.zoom, x, y]))) / 1000000
                 const value = model.get(x, y)