diff --git a/src/vs/workbench/contrib/terminal/browser/terminalConfigurationService.ts b/src/vs/workbench/contrib/terminal/browser/terminalConfigurationService.ts
index 326d159c07829..93d0e090056b6 100644
--- a/src/vs/workbench/contrib/terminal/browser/terminalConfigurationService.ts
+++ b/src/vs/workbench/contrib/terminal/browser/terminalConfigurationService.ts
@@ -120,7 +120,7 @@ export class TerminalFontMetrics extends Disposable {
 		const editorConfig = this._configurationService.getValue<IEditorOptions>('editor');
 
 		let fontFamily = this._terminalConfigurationService.config.fontFamily || editorConfig.fontFamily || EDITOR_FONT_DEFAULTS.fontFamily || 'monospace';
-		let fontSize = clampInt(this._terminalConfigurationService.config.fontSize, FontConstants.MinimumFontSize, FontConstants.MaximumFontSize, EDITOR_FONT_DEFAULTS.fontSize);
+		let fontSize = clampFloat(this._terminalConfigurationService.config.fontSize, FontConstants.MinimumFontSize, FontConstants.MaximumFontSize, EDITOR_FONT_DEFAULTS.fontSize);
 
 		// Work around bad font on Fedora/Ubuntu
 		if (!this._terminalConfigurationService.config.fontFamily) {
@@ -131,7 +131,7 @@ export class TerminalFontMetrics extends Disposable {
 				fontFamily = '\'Ubuntu Mono\'';
 
 				// Ubuntu mono is somehow smaller, so set fontSize a bit larger to get the same perceived size.
-				fontSize = clampInt(fontSize + 2, FontConstants.MinimumFontSize, FontConstants.MaximumFontSize, EDITOR_FONT_DEFAULTS.fontSize);
+				fontSize = clampFloat(fontSize + 2, FontConstants.MinimumFontSize, FontConstants.MaximumFontSize, EDITOR_FONT_DEFAULTS.fontSize);
 			}
 		}
 
@@ -256,4 +256,15 @@ function clampInt<T>(source: string | number, minimum: number, maximum: number,
 	}
 	return clamp(r, minimum, maximum);
 }
+
+function clampFloat<T>(source: string | number, minimum: number, maximum: number, fallback: T): number | T {
+	if (source === null || source === undefined) {
+		return fallback;
+	}
+	const r = isString(source) ? parseFloat(source) : source;
+	if (isNaN(r)) {
+		return fallback;
+	}
+	return clamp(r, minimum, maximum);
+}
 // #endregion Utils
diff --git a/src/vs/workbench/contrib/terminal/test/browser/terminalConfigurationService.test.ts b/src/vs/workbench/contrib/terminal/test/browser/terminalConfigurationService.test.ts
index 206b113186ca2..e33b61508c51e 100644
--- a/src/vs/workbench/contrib/terminal/test/browser/terminalConfigurationService.test.ts
+++ b/src/vs/workbench/contrib/terminal/test/browser/terminalConfigurationService.test.ts
@@ -186,6 +186,53 @@ suite('Workbench - TerminalConfigurationService', () => {
 			strictEqual(terminalConfigurationService.getFont(getActiveWindow()).fontSize, EDITOR_FONT_DEFAULTS.fontSize, 'The default editor font size should be used when terminal.integrated.fontSize is not set');
 		});
 
+		test('fontSize 11.5 (decimal)', () => {
+			const terminalConfigurationService = createTerminalConfigationService({
+				editor: {
+					fontFamily: 'foo',
+					fontSize: 9
+				},
+				terminal: {
+					integrated: {
+						fontFamily: 'bar',
+						fontSize: 11.5
+					}
+				}
+			});
+			strictEqual(terminalConfigurationService.getFont(getActiveWindow()).fontSize, 11.5, 'terminal.integrated.fontSize should preserve decimal values');
+		});
+
+		test('fontSize 13.25 (decimal)', () => {
+			const terminalConfigurationService = createTerminalConfigationService({
+				editor: {
+					fontFamily: 'foo',
+					fontSize: 9
+				},
+				terminal: {
+					integrated: {
+						fontFamily: 'bar',
+						fontSize: 13.25
+					}
+				}
+			});
+			strictEqual(terminalConfigurationService.getFont(getActiveWindow()).fontSize, 13.25, 'terminal.integrated.fontSize should preserve decimal values like 13.25');
+		});
+
+		test('fontSize decimal (Linux Ubuntu)', () => {
+			const terminalConfigurationService = createTerminalConfigationService({
+				editor: {
+					fontFamily: 'foo'
+				},
+				terminal: {
+					integrated: {
+						fontFamily: null,
+						fontSize: 10.5
+					}
+				}
+			}, LinuxDistro.Ubuntu);
+			strictEqual(terminalConfigurationService.getFont(getActiveWindow()).fontSize, 12.5, 'Ubuntu font size adjustment should preserve decimal values (10.5 + 2 = 12.5)');
+		});
+
 		test('lineHeight 2', () => {
 			const terminalConfigurationService = createTerminalConfigationService({
 				editor: {