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diff --git a/server/sonar-web/src/main/js/components/measure/RatingTooltipContent.tsx b/server/sonar-web/src/main/js/components/measure/RatingTooltipContent.tsx
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+/*
+ * SonarQube
+ * Copyright (C) 2009-2022 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+import * as React from 'react';
+import withAppStateContext from '../../app/components/app-state/withAppStateContext';
+import { translate, translateWithParameters } from '../../helpers/l10n';
+import { formatMeasure, isDiffMetric } from '../../helpers/measures';
+import { AppState } from '../../types/appstate';
+import { MetricKey } from '../../types/metrics';
+import { GlobalSettingKeys } from '../../types/settings';
+import { KNOWN_RATINGS } from './utils';
+
+const RATING_GRID_SIZE = 4;
+const DIFF_METRIC_PREFIX_LENGTH = 4;
+const PERCENT_MULTIPLIER = 100;
+const GRID_INDEX_OFFSET = 2; // Rating of 2 should get index 0 (threshold between 1 and 2)
+
+export interface RatingTooltipContentProps {
+  appState: AppState;
+  metricKey: MetricKey | string;
+  value: number | string;
+}
+
+function getMaintainabilityGrid(ratingGridSetting: string) {
+  const numbers = ratingGridSetting
+    .split(',')
+    .map(s => parseFloat(s))
+    .filter(n => !isNaN(n));
+
+  return numbers.length === RATING_GRID_SIZE ? numbers : [0, 0, 0, 0];
+}
+
+export function RatingTooltipContent(props: RatingTooltipContentProps) {
+  const {
+    appState: { settings },
+    metricKey,
+    value
+  } = props;
+
+  const finalMetricKey = isDiffMetric(metricKey)
+    ? metricKey.slice(DIFF_METRIC_PREFIX_LENGTH)
+    : metricKey;
+
+  if (!KNOWN_RATINGS.includes(finalMetricKey)) {
+    return null;
+  }
+
+  const rating = Number(value);
+  const ratingLetter = formatMeasure(value, 'RATING');
+
+  if (finalMetricKey !== 'sqale_rating' && finalMetricKey !== 'maintainability_rating') {
+    return <>{translate('metric', finalMetricKey, 'tooltip', ratingLetter)}</>;
+  }
+
+  const maintainabilityGrid = getMaintainabilityGrid(settings[GlobalSettingKeys.RatingGrid] ?? '');
+  const maintainabilityRatingThreshold =
+    maintainabilityGrid[Math.floor(rating) - GRID_INDEX_OFFSET];
+
+  return (
+    // Required to correctly satisfy the context typing
+    // eslint-disable-next-line react/jsx-no-useless-fragment
+    <>
+      {rating === 1
+        ? translateWithParameters(
+            'metric.sqale_rating.tooltip.A',
+            formatMeasure(maintainabilityGrid[0] * PERCENT_MULTIPLIER, 'PERCENT')
+          )
+        : translateWithParameters(
+            'metric.sqale_rating.tooltip',
+            ratingLetter,
+            formatMeasure(maintainabilityRatingThreshold * PERCENT_MULTIPLIER, 'PERCENT')
+          )}
+    </>
+  );
+}
+
+export default withAppStateContext(RatingTooltipContent);