diff --git a/web/utils/text-utils.js b/web/utils/text-utils.js
--- a/web/utils/text-utils.js
+++ b/web/utils/text-utils.js
@@ -6,8 +6,12 @@
 
 function calculateMaxTextWidth(
   texts: $ReadOnlyArray<string>,
-  font: string,
+  fontSize: number,
 ): number {
+  const font =
+    `${fontSize}px "Inter", -apple-system, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", ` +
+    '"Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", ui-sans-serif';
+
   if (!canvas) {
     canvas = document.createElement('canvas');
   }
diff --git a/web/utils/tooltip-utils.js b/web/utils/tooltip-utils.js
--- a/web/utils/tooltip-utils.js
+++ b/web/utils/tooltip-utils.js
@@ -46,10 +46,6 @@
   +actionButtonContent: React.Node,
 };
 
-const font =
-  '14px "Inter", -apple-system, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", ' +
-  '"Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", ui-sans-serif';
-
 type FindTooltipPositionArgs = {
   +sourcePositionInfo: PositionInfo,
   +tooltipSize: TooltipSize,
@@ -335,7 +331,7 @@
   +height: number,
 } {
   const textWidth =
-    calculateMaxTextWidth([...tooltipLabels, timestamp], font) +
+    calculateMaxTextWidth([...tooltipLabels, timestamp], 14) +
     2 * tooltipLabelStyle.padding;
   const buttonsWidth =
     tooltipLabels.length *