diff --git a/tools/fonts/font-scaling-array-generator.js b/tools/fonts/font-scaling-array-generator.js
new file mode 100644
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+++ b/tools/fonts/font-scaling-array-generator.js
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+  Generates arrays for non-linear font scaling, to be pasted into
+  frameworks/base/core/java/android/content/res/FontScaleConverterFactory.java
+
+  To use:
+    `node font-scaling-array-generator.js`
+    or just open a browser, open DevTools, and paste into the Console.
+*/
+
+/**
+ * Modify this to match your packages/apps/Settings/res/arrays.xml#entryvalues_font_size
+ * array so that all possible scales are generated.
+ */
+const scales = [1.15, 1.30, 1.5, 1.8, 2];
+
+const commonSpSizes = [8, 10, 12, 14, 18, 20, 24, 30, 100];
+
+/**
+ * Enum for GENERATION_STYLE which determines how to generate the arrays.
+ */
+const GenerationStyle = {
+  /**
+   * Interpolates between hand-tweaked curves. This is the best option and
+   * shouldn't require any additional tweaking.
+   */
+  CUSTOM_TWEAKED: 'CUSTOM_TWEAKED',
+
+  /**
+   * Uses a curve equation that is mostly correct, but will need manual tweaking
+   * at some scales.
+   */
+  CURVE: 'CURVE',
+
+  /**
+   * Uses straight linear multiplication. Good starting point for manual
+   * tweaking.
+   */
+  LINEAR: 'LINEAR'
+}
+
+/**
+ * Determines how arrays are generated. Must be one of the GenerationStyle
+ * values.
+ */
+const GENERATION_STYLE = GenerationStyle.CUSTOM_TWEAKED;
+
+// These are hand-tweaked curves from which we will derive the other
+// interstitial curves using linear interpolation, in the case of using
+// GenerationStyle.CUSTOM_TWEAKED.
+const interpolationTargets = {
+  1.0: commonSpSizes,
+  1.5: [12, 15, 18, 22, 24, 26, 28, 30, 100],
+  2.0: [16, 20, 24, 26, 30, 34, 36, 38, 100]
+};
+
+/**
+ * Interpolate a value with specified extrema, to a new value between new
+ * extrema.
+ *
+ * @param value the current value
+ * @param inputMin minimum the input value can reach
+ * @param inputMax maximum the input value can reach
+ * @param outputMin minimum the output value can reach
+ * @param outputMax maximum the output value can reach
+ */
+function map(value, inputMin, inputMax, outputMin, outputMax) {
+  return outputMin + (outputMax - outputMin) * ((value - inputMin) / (inputMax - inputMin));
+}
+
+/***
+ * Interpolate between values a and b.
+ */
+function lerp(a, b, fraction) {
+  return (a * (1.0 - fraction)) + (b * fraction);
+}
+
+function generateRatios(scale) {
+  // Find the best two arrays to interpolate between.
+  let startTarget, endTarget;
+  let startTargetScale, endTargetScale;
+  const targetScales = Object.keys(interpolationTargets).sort();
+  for (let i = 0; i < targetScales.length - 1; i++) {
+    const targetScaleKey = targetScales[i];
+    const targetScale = parseFloat(targetScaleKey, 10);
+    const startTargetScaleKey = targetScaleKey;
+    const endTargetScaleKey = targetScales[i + 1];
+
+    if (scale < parseFloat(startTargetScaleKey, 10)) {
+      break;
+    }
+
+    startTargetScale = parseFloat(startTargetScaleKey, 10);
+    endTargetScale = parseFloat(endTargetScaleKey, 10);
+    startTarget = interpolationTargets[startTargetScaleKey];
+    endTarget = interpolationTargets[endTargetScaleKey];
+  }
+  const interpolationProgress = map(scale, startTargetScale, endTargetScale, 0, 1);
+
+  return commonSpSizes.map((sp, i) => {
+    const originalSizeDp = sp;
+    let newSizeDp;
+    switch (GENERATION_STYLE) {
+      case GenerationStyle.CUSTOM_TWEAKED:
+        newSizeDp = lerp(startTarget[i], endTarget[i], interpolationProgress);
+        break;
+      case GenerationStyle.CURVE: {
+        let coeff1;
+        let coeff2;
+        if (scale < 1) {
+          // \left(1.22^{-\left(x+5\right)}+0.5\right)\cdot x
+          coeff1 = -5;
+          coeff2 = scale;
+        } else {
+          // (1.22^{-\left(x-10\right)}+1\right)\cdot x
+          coeff1 = map(scale, 1, 2, 2, 8);
+          coeff2 = 1;
+        }
+        newSizeDp = ((Math.pow(1.22, (-(originalSizeDp - coeff1))) + coeff2) * originalSizeDp);
+        break;
+      }
+      case GenerationStyle.LINEAR:
+        newSizeDp = originalSizeDp * scale;
+        break;
+      default:
+        throw new Error('Invalid GENERATION_STYLE');
+    }
+    return {
+      fromSp: sp,
+      toDp: newSizeDp
+    }
+  });
+}
+
+const scaleArrays =
+    scales
+        .map(scale => {
+          const scaleString = (scale * 100).toFixed(0);
+          return {
+            scale,
+            name: `font_size_original_sp_to_scaled_dp_${scaleString}_percent`
+          }
+        })
+        .map(scaleArray => {
+          const items = generateRatios(scaleArray.scale);
+
+          return {
+            ...scaleArray,
+            items
+          }
+        });
+
+function formatDigit(d) {
+  const twoSignificantDigits = Math.round(d * 100) / 100;
+  return String(twoSignificantDigits).padStart(4, ' ');
+}
+
+console.log(
+    '' +
+    scaleArrays.reduce(
+        (previousScaleArray, currentScaleArray) => {
+          const itemsFromSp = currentScaleArray.items.map(d => d.fromSp)
+                                .map(formatDigit)
+                                .join('f, ');
+          const itemsToDp = currentScaleArray.items.map(d => d.toDp)
+                                .map(formatDigit)
+                                .join('f, ');
+
+          return previousScaleArray + `
+        put(
+                /* scaleKey= */ ${currentScaleArray.scale}f,
+                new FontScaleConverter(
+                        /* fromSp= */
+                        new float[] {${itemsFromSp}},
+                        /* toDp=   */
+                        new float[] {${itemsToDp}})
+        );
+     `;
+        },
+        ''));