diff --git a/examples/tests/text-vertical-center.ts b/examples/tests/text-vertical-center.ts
new file mode 100644
index 0000000..ff296ab
--- /dev/null
+++ b/examples/tests/text-vertical-center.ts
@@ -0,0 +1,131 @@
+import type { ExampleSettings } from '../common/ExampleSettings.js';
+
+/**
+ * Visual inspection page for vertical text alignment when
+ * `lineHeight === boxHeight`.
+ *
+ * Each box is a fixed size with a colored background and a horizontal red
+ * line drawn at the geometric center (y = h / 2). A text node is placed at
+ * (0, 0) inside the box with `lineHeight = boxHeight` and varying `fontSize`.
+ *
+ * What "centered" should mean is the open question — current behavior is
+ * baseline anchoring, so the *baseline* sits at `halfLeading + ascender`
+ * from the top of the line box and the visual mass of the glyphs shifts
+ * with the font's asc / desc ratio. The red guide line lets you eyeball
+ * how far each glyph row's optical center drifts from the box's geometric
+ * center as fontSize changes.
+ */
+export default async function test({ renderer, testRoot }: ExampleSettings) {
+  testRoot.color = 0xf0f0f0ff;
+
+  const BOX_W = 220;
+  const BOX_H = 120;
+  const COL_GAP = 20;
+  const ROW_GAP = 20;
+  const MARGIN_X = 40;
+  const HEADER_H = 60;
+  const ROW_LABEL_W = 130;
+
+  const FONT_SIZES = [20, 40, 60, 80, 100];
+  const SAMPLES: Array<{ label: string; text: string }> = [
+    { label: 'caps', text: 'TXYZ' },
+    { label: 'mixed', text: 'Abcg' },
+    // Mixed-case word with no descenders (caps + lowercase ascenders +
+    // x-height-only letters). Useful for spotting whether lowercase letters
+    // sit comfortably with capitals when the descender tail isn't present
+    // to pull the eye downward.
+    { label: 'no desc.', text: 'Acme' },
+    { label: 'descend.', text: 'gjpqy' },
+    { label: 'digits', text: '1234' },
+    { label: 'punct.', text: ',._—' },
+  ];
+
+  renderer.createTextNode({
+    parent: testRoot,
+    x: MARGIN_X,
+    y: 10,
+    text: 'Vertical centering — lineHeight = boxHeight (red line = box center)',
+    fontFamily: 'Ubuntu',
+    fontSize: 28,
+    color: 0x222222ff,
+  });
+
+  // Column labels (one per sample, above the first row)
+  for (let c = 0; c < SAMPLES.length; c++) {
+    const col = SAMPLES[c]!;
+    renderer.createTextNode({
+      parent: testRoot,
+      x: MARGIN_X + ROW_LABEL_W + c * (BOX_W + COL_GAP),
+      y: HEADER_H,
+      text: `${col.label}: "${col.text}"`,
+      fontFamily: 'Ubuntu',
+      fontSize: 18,
+      color: 0x333333ff,
+    });
+  }
+
+  const ROWS_Y = HEADER_H + 30;
+  // A repeating soft palette so each row is easy to distinguish.
+  const BOX_COLORS = [
+    0xdfe9f5ff, 0xf5e9dfff, 0xe2f0e2ff, 0xf0e2f0ff, 0xfff4ccff,
+  ];
+
+  for (let r = 0; r < FONT_SIZES.length; r++) {
+    const fontSize = FONT_SIZES[r]!;
+    const rowY = ROWS_Y + r * (BOX_H + ROW_GAP);
+
+    // Row label: which fontSize this row uses.
+    renderer.createTextNode({
+      parent: testRoot,
+      x: MARGIN_X,
+      y: rowY + BOX_H / 2,
+      mountY: 0.5,
+      text: `fontSize ${fontSize}`,
+      fontFamily: 'Ubuntu',
+      fontSize: 20,
+      color: 0x222222ff,
+    });
+
+    for (let c = 0; c < SAMPLES.length; c++) {
+      const sample = SAMPLES[c]!;
+      const boxX = MARGIN_X + ROW_LABEL_W + c * (BOX_W + COL_GAP);
+
+      // Colored container.
+      const box = renderer.createNode({
+        parent: testRoot,
+        x: boxX,
+        y: rowY,
+        w: BOX_W,
+        h: BOX_H,
+        color: BOX_COLORS[r % BOX_COLORS.length]!,
+        clipping: true,
+      });
+
+      // Geometric center guide.
+      renderer.createNode({
+        parent: box,
+        x: 0,
+        y: Math.round(BOX_H / 2),
+        w: BOX_W,
+        h: 1,
+        color: 0xff0000ff,
+      });
+
+      // The text under test — lineHeight == box height.
+      renderer.createTextNode({
+        parent: box,
+        x: 0,
+        y: 0,
+        text: sample.text,
+        fontFamily: 'Ubuntu',
+        fontSize,
+        lineHeight: BOX_H,
+        color: 0x111111ff,
+        textAlign: 'center',
+        maxWidth: BOX_W,
+      });
+    }
+  }
+
+  return testRoot;
+}
diff --git a/src/core/Stage.ts b/src/core/Stage.ts
index 923a617..e3eb43e 100644
--- a/src/core/Stage.ts
+++ b/src/core/Stage.ts
@@ -21,6 +21,7 @@ import {
   type TextRenderers,
   type TrProps,
 } from './text-rendering/TextRenderer.js';
+import { setBaselineMode } from './text-rendering/TextLayoutEngine.js';
 
 import { EventEmitter } from '../common/EventEmitter.js';
 import { ContextSpy } from './lib/ContextSpy.js';
@@ -175,6 +176,12 @@ export class Stage {
       'A CorePlatform is not provided in the options',
     );
 
+    // Configure the engine-wide text baseline anchor before any node is
+    // created. TextLayoutEngine reads this value when laying out every line;
+    // setting it during Stage construction ensures it's stable for the
+    // lifetime of the renderer.
+    setBaselineMode(options.textBaselineMode);
+
     this.platform = platform;
 
     this.startTime = platform.getTimeStamp();
diff --git a/src/core/text-rendering/SdfFontHandler.ts b/src/core/text-rendering/SdfFontHandler.ts
index c1ad08b..d938a71 100644
--- a/src/core/text-rendering/SdfFontHandler.ts
+++ b/src/core/text-rendering/SdfFontHandler.ts
@@ -229,6 +229,43 @@ const processFontData = (
       unitsPerEm: 1000,
     };
 
+  // Derive cap-height from the atlas when the metrics block doesn't already
+  // supply it. The layout engine uses this value to vertically center
+  // capital letters on each line. BMFont stores per-glyph `yoffset` as the
+  // distance from the line-box top to the glyph's top, and `common.base` as
+  // the distance from the line-box top to the alphabetic baseline — so the
+  // distance from the baseline up to the top of 'H' (atlas design px) is
+  // `common.base - H.yoffset`. Converted into font units it slots into
+  // `FontMetrics.capHeight` alongside the existing ascender / descender
+  // values and flows through `normalizeFontMetrics`.
+  if (metrics.capHeight === undefined) {
+    const capGlyph = glyphMap.get(72); // 'H'
+    if (capGlyph !== undefined) {
+      const capHeightAtlasPx = fontData.common.base - capGlyph.yoffset;
+      metrics = {
+        ...metrics,
+        capHeight: (capHeightAtlasPx / fontData.info.size) * metrics.unitsPerEm,
+      };
+    }
+    // If 'H' isn't in the atlas (icon-only fonts, etc.) we leave capHeight
+    // undefined and rely on the 0.7 × ascender fallback inside
+    // normalizeFontMetrics.
+  }
+
+  // Same derivation for x-height using glyph 'x' (id 120). Only consumed
+  // when `RendererMainSettings.textBaselineMode === 'x'`; otherwise the
+  // 0.5 × ascender fallback inside `normalizeFontMetrics` is sufficient.
+  if (metrics.xHeight === undefined) {
+    const xGlyph = glyphMap.get(120); // 'x'
+    if (xGlyph !== undefined) {
+      const xHeightAtlasPx = fontData.common.base - xGlyph.yoffset;
+      metrics = {
+        ...metrics,
+        xHeight: (xHeightAtlasPx / fontData.info.size) * metrics.unitsPerEm,
+      };
+    }
+  }
+
   // Cache processed data
   fontCache.set(fontFamily, {
     data: fontData,
diff --git a/src/core/text-rendering/TextLayoutEngine.ts b/src/core/text-rendering/TextLayoutEngine.ts
index 86906fe..0346b14 100644
--- a/src/core/text-rendering/TextLayoutEngine.ts
+++ b/src/core/text-rendering/TextLayoutEngine.ts
@@ -2,6 +2,7 @@ import type {
   FontMetrics,
   MeasureTextFn,
   NormalizedFontMetrics,
+  TextBaselineMode,
   TextLayoutStruct,
   TextLineStruct,
   WrappedLinesStruct,
@@ -35,18 +36,53 @@ type WrapStrategyFn = (
   overflowWidth: number,
 ) => [string, number, string];
 
+/**
+ * Generic Latin-font ratios used when exact metric values aren't available.
+ * Within a few percent of OS/2 sCapHeight / sxHeight across the common Latin
+ * families (Ubuntu, Noto, Roboto, Arial, etc.).
+ */
+const CAP_HEIGHT_FALLBACK_RATIO = 0.7;
+const X_HEIGHT_FALLBACK_RATIO = 0.5;
+
 export const normalizeFontMetrics = (
   metrics: FontMetrics,
   fontSize: number,
 ): NormalizedFontMetrics => {
   const scale = fontSize / metrics.unitsPerEm;
+  const capHeightUnits =
+    metrics.capHeight !== undefined
+      ? metrics.capHeight
+      : metrics.ascender * CAP_HEIGHT_FALLBACK_RATIO;
+  const xHeightUnits =
+    metrics.xHeight !== undefined
+      ? metrics.xHeight
+      : metrics.ascender * X_HEIGHT_FALLBACK_RATIO;
   return {
     ascender: metrics.ascender * scale,
     descender: metrics.descender * scale,
     lineGap: metrics.lineGap * scale,
+    capHeight: capHeightUnits * scale,
+    xHeight: xHeightUnits * scale,
   };
 };
 
+/**
+ * Engine-wide per-line baseline anchor. Configured once at renderer creation
+ * via {@link RendererMainSettings.textBaselineMode}, not exposed per node so
+ * a single app can't mix anchor models across its text. Defaults to `'cap'`
+ * — see {@link TextBaselineMode} for the rationale.
+ */
+let baselineMode: TextBaselineMode = 'cap';
+
+/**
+ * Sets the engine-wide baseline anchor. Called by `Stage` during construction;
+ * not intended to be called from user code (changing this mid-session would
+ * silently reflow every cached text layout).
+ */
+export const setBaselineMode = (mode: TextBaselineMode): void => {
+  baselineMode = mode;
+};
+
 export const mapTextLayout = (
   measureText: MeasureTextFn,
   metrics: NormalizedFontMetrics,
@@ -61,18 +97,12 @@ export const mapTextLayout = (
   maxWidth: number,
   maxHeight: number,
 ): TextLayoutStruct => {
-  const ascPx = metrics.ascender;
-  const descPx = metrics.descender;
-  const lineGapPx = metrics.lineGap;
-
   // Default line height matches CSS 'normal': ascender + lineGap - descender.
-  // descPx is negative for descents below the baseline.
-  const bareLineHeight = ascPx - descPx + lineGapPx;
+  // metrics.descender is negative for descents below the baseline, so
+  // subtracting it adds the descent depth.
+  const bareLineHeight = metrics.ascender - metrics.descender + metrics.lineGap;
   const lineHeightPx =
     lineHeight <= 3 ? lineHeight * bareLineHeight : lineHeight;
-  // Half-leading: extra space split evenly above the ascent and below the descent.
-  // Negative when the user requests a line height smaller than the font's own extent.
-  const halfLeading = (lineHeightPx - bareLineHeight) * 0.5;
 
   let effectiveMaxLines = maxLines;
 
@@ -154,9 +184,46 @@ export const mapTextLayout = (
   const effectiveMaxHeight = effectiveLineAmount * lineHeightPx;
 
   // line[4] stores the alphabetic baseline Y of each line in screen px.
-  // The first baseline sits half-leading + ascender below the line box top,
-  // matching CSS line box layout.
-  const firstBaselineY = halfLeading + ascPx;
+  //
+  // ── Per-line anchor: cap-height centering ─────────────────────────────
+  //
+  //   baselineY(i) = lineHeight/2 + capHeight/2 + i × lineHeight
+  //
+  // The baseline sits below the line's geometric mid-line by exactly
+  // `capHeight / 2`, so the top of an uppercase letter lands the same
+  // distance *above* the mid-line — i.e. capital letters bracket the
+  // center symmetrically. Cap-height centering matches what designers
+  // expect for UI text (button labels, headings, badges): TXYZ and 1234
+  // sit centered; descenders like 'gjpq' hang slightly below, mirroring
+  // CSS button behavior in browsers.
+  //
+  // Alternative anchors considered (kept here for the record):
+  //
+  //   ── x-height centering ──────────────────────────────────────────────
+  //   baselineY(i) = lineHeight/2 + xHeight/2 + i × lineHeight
+  //   Centers lowercase letters on the mid-line. Matches CSS inline
+  //   `vertical-align: middle`. Reads well for running body text but
+  //   capitals appear high in headings/labels — wrong default for TV UI.
+  //
+  //   ── line-box centering (pre-cap-height behavior) ───────────────────
+  //   const halfLeading = (lineHeightPx − bareLineHeight) / 2
+  //   baselineY(i) = halfLeading + ascender + i × lineHeight
+  //   Centers the abstract asc-to-desc-plus-leading rectangle. The visible
+  //   ink lands noticeably high because asc/(asc−desc) is asymmetric for
+  //   most Latin fonts (~4.2:1 for Ubuntu). Mathematically tidy, visually
+  //   wrong.
+  //
+  // The active anchor is configured at renderer creation via
+  // `RendererMainSettings.textBaselineMode`. Defaults to `'cap'`.
+  let firstBaselineY: number;
+  if (baselineMode === 'x') {
+    firstBaselineY = (lineHeightPx + metrics.xHeight) * 0.5;
+  } else if (baselineMode === 'linebox') {
+    const halfLeading = (lineHeightPx - bareLineHeight) * 0.5;
+    firstBaselineY = halfLeading + metrics.ascender;
+  } else {
+    firstBaselineY = (lineHeightPx + metrics.capHeight) * 0.5;
+  }
   for (let i = 0; i < effectiveLineAmount; i++) {
     const line = lines[i] as TextLineStruct;
     line[4] = firstBaselineY + lineHeightPx * i;
diff --git a/src/core/text-rendering/TextRenderer.ts b/src/core/text-rendering/TextRenderer.ts
index 1ee56d9..5ba41e6 100644
--- a/src/core/text-rendering/TextRenderer.ts
+++ b/src/core/text-rendering/TextRenderer.ts
@@ -14,6 +14,24 @@ export type TextBaseline =
   | 'bottom';
 export type TextVerticalAlign = 'top' | 'middle' | 'bottom';
 export type TextRenderers = 'canvas' | 'sdf';
+
+/**
+ * Selects which font-derived height the text layout engine centers on each
+ * line's geometric mid-line. Configured via {@link RendererMainSettings} and
+ * cannot be overridden per node — see the engine-wide reasoning in
+ * `TextLayoutEngine.mapTextLayout`.
+ *
+ * - `'cap'` (default): capital letters centered. Best for UI text — button
+ *   labels, headings, badges. Capitals and digits bracket the center
+ *   symmetrically; descenders hang slightly below, matching CSS button
+ *   behavior in browsers.
+ * - `'x'`: lowercase x-height centered. Better for running body text;
+ *   capitals appear slightly high in headings.
+ * - `'linebox'`: legacy. Centers the abstract asc-to-desc-plus-leading
+ *   rectangle. Mathematically tidy but visually unbalanced because most
+ *   Latin fonts have asymmetric asc/desc ratios.
+ */
+export type TextBaselineMode = 'cap' | 'x' | 'linebox';
 /**
  * Structure mapping font family names to a set of font faces.
  */
@@ -41,24 +59,54 @@ export interface FontMetrics {
    * The number of font units per 1 EM.
    */
   unitsPerEm: number;
+  /**
+   * The distance, in font units, from the baseline to the top of an uppercase
+   * letter (OS/2 sCapHeight).
+   *
+   * Used by the layout engine to vertically center capital letters on each
+   * line's geometric mid-line. When absent, the SDF backend derives this
+   * value from glyph `H` (id 72) in the BMFont atlas; the Canvas backend
+   * falls back to `0.7 × ascender` (a generic Latin-font approximation).
+   */
+  capHeight?: number;
+  /**
+   * The distance, in font units, from the baseline to the top of a lowercase
+   * letter (OS/2 sxHeight). Optional; used only when the baseline-anchor
+   * mode is set to x-height centering (experimental).
+   */
+  xHeight?: number;
 }
 
 /**
- * Normalized font metrics where values are expressed as a fraction of 1 EM.
+ * Normalized font metrics where values are expressed in pixels at the
+ * configured font size (em-px).
  */
 export interface NormalizedFontMetrics {
   /**
-   * The distance, as a fraction of 1 EM, from the baseline to the highest point of the font.
+   * The distance, in em-px, from the baseline to the highest point of the font.
    */
   ascender: number;
   /**
-   * The distance, as a fraction of 1 EM, from the baseline to the lowest point of the font.
+   * The distance, in em-px, from the baseline to the lowest point of the font.
    */
   descender: number;
   /**
-   * The additional space used in the calculation of the default line height as a fraction of 1 EM
+   * The additional space used in the calculation of the default line height, in em-px.
    */
   lineGap: number;
+  /**
+   * The distance, in em-px, from the baseline to the top of an uppercase letter.
+   * Always populated; derived or approximated when {@link FontMetrics.capHeight}
+   * is not provided by the caller.
+   */
+  capHeight: number;
+  /**
+   * The distance, in em-px, from the baseline to the top of a lowercase letter.
+   * Always populated; derived from glyph `x` for SDF, falls back to
+   * `0.5 × ascender` otherwise. Only used by the experimental x-height
+   * baseline-anchor mode.
+   */
+  xHeight: number;
 }
 
 /**
diff --git a/src/main-api/Renderer.ts b/src/main-api/Renderer.ts
index 082a4a4..cedec0b 100644
--- a/src/main-api/Renderer.ts
+++ b/src/main-api/Renderer.ts
@@ -6,7 +6,10 @@ import { CoreNode, type CoreNodeProps } from '../core/CoreNode.js';
 import { type CoreTextNodeProps } from '../core/CoreTextNode.js';
 import type { INode, INodeProps, ITextNode, ITextNodeProps } from './INode.js';
 import type { TextureMemoryManagerSettings } from '../core/TextureMemoryManager.js';
-import type { TextRenderer } from '../core/text-rendering/TextRenderer.js';
+import type {
+  TextBaselineMode,
+  TextRenderer,
+} from '../core/text-rendering/TextRenderer.js';
 import type { CanvasRenderer } from '../core/renderers/canvas/CanvasRenderer.js';
 import type { WebGlRenderer } from '../core/renderers/webgl/WebGlRenderer.js';
 import type { Inspector, InspectorOptions } from './Inspector.js';
@@ -363,6 +366,28 @@ export type RendererMainSettings = RendererRuntimeSettings & {
    */
   fontEngines: TextRenderer[];
 
+  /**
+   * Per-line vertical baseline anchor used by the text layout engine.
+   *
+   * @remarks
+   * Picks which font-derived height is centered on each line's geometric
+   * mid-line. This is engine-wide and intentionally not exposed per node —
+   * mixing anchor models within one app produces visually inconsistent text.
+   *
+   * - `'cap'` (default): capital letters and digits sit centered on the line.
+   *   Best fit for UI text (button labels, headings, badges); descenders on
+   *   words like 'gjpq' hang slightly below center, matching CSS button
+   *   behavior in browsers.
+   * - `'x'`: lowercase x-height is centered. Better for running body text;
+   *   capitals appear slightly high in headings.
+   * - `'linebox'`: legacy mode. Centers the asc/lineGap/desc rectangle.
+   *   Mathematically tidy but visually unbalanced because most Latin fonts
+   *   have asymmetric asc/desc ratios.
+   *
+   * @defaultValue `'cap'`
+   */
+  textBaselineMode: TextBaselineMode;
+
   /**
    * Force WebGL2
    *
@@ -530,6 +555,7 @@ export class RendererMain extends EventEmitter {
       renderEngine: settings.renderEngine,
       quadBufferSize: settings.quadBufferSize ?? 4 * 1024 * 1024,
       fontEngines: settings.fontEngines ?? [],
+      textBaselineMode: settings.textBaselineMode ?? 'cap',
       textureProcessingTimeLimit: settings.textureProcessingTimeLimit || 10,
       canvas: settings.canvas,
       createImageBitmapSupport: settings.createImageBitmapSupport || 'full',
@@ -588,6 +614,7 @@ export class RendererMain extends EventEmitter {
       eventBus: this,
       quadBufferSize: settings.quadBufferSize!,
       fontEngines: settings.fontEngines!,
+      textBaselineMode: settings.textBaselineMode!,
       inspector: settings.inspector !== null,
       targetFPS: settings.targetFPS!,
       textureProcessingTimeLimit: settings.textureProcessingTimeLimit!,
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