diff --git a/packages/cli/src/ui/format.test.ts b/packages/cli/src/ui/format.test.ts
index f1d13fe2496..938d3a4a92a 100644
--- a/packages/cli/src/ui/format.test.ts
+++ b/packages/cli/src/ui/format.test.ts
@@ -1,6 +1,8 @@
 import { describe, expect, it } from "vitest";
 
 import {
+  formatBytes,
+  formatDuration,
   formatRenderPipelineDetail,
   formatRenderSummaryDetail,
   formatScreenshotFallbackHint,
@@ -168,3 +170,30 @@ describe("formatRenderSummaryDetail", () => {
     );
   });
 });
+
+describe("formatDuration", () => {
+  it("shows seconds with one decimal under a minute", () => {
+    expect(formatDuration(0)).toBe("0.0s");
+    expect(formatDuration(1234)).toBe("1.2s");
+    expect(formatDuration(59_940)).toBe("59.9s");
+  });
+
+  it("carries a rounded-up 60.0 seconds into the next minute", () => {
+    expect(formatDuration(59_960)).toBe("1m 0.0s");
+    expect(formatDuration(119_970)).toBe("2m 0.0s");
+  });
+
+  it("splits minutes and seconds past one minute", () => {
+    expect(formatDuration(60_000)).toBe("1m 0.0s");
+    expect(formatDuration(83_400)).toBe("1m 23.4s");
+  });
+});
+
+describe("formatBytes", () => {
+  it("steps up a unit when rounding reaches the next one", () => {
+    expect(formatBytes(1023)).toBe("1023 B");
+    expect(formatBytes(1536)).toBe("1.5 KB");
+    expect(formatBytes(1_048_575)).toBe("1.0 MB");
+    expect(formatBytes(1_048_576)).toBe("1.0 MB");
+  });
+});
diff --git a/packages/cli/src/ui/format.ts b/packages/cli/src/ui/format.ts
index df3d2683d20..c908beb375f 100644
--- a/packages/cli/src/ui/format.ts
+++ b/packages/cli/src/ui/format.ts
@@ -3,16 +3,16 @@ import { c } from "./colors.js";
 
 export function formatBytes(bytes: number): string {
   if (bytes < 1024) return `${bytes} B`;
-  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  const kb = Math.round((bytes / 1024) * 10) / 10;
+  if (kb < 1024) return `${kb.toFixed(1)} KB`;
   return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
 }
 
 export function formatDuration(ms: number): string {
-  const seconds = ms / 1000;
-  if (seconds < 60) return `${seconds.toFixed(1)}s`;
-  const minutes = Math.floor(seconds / 60);
-  const remaining = seconds - minutes * 60;
-  return `${minutes}m ${remaining.toFixed(1)}s`;
+  const tenths = Math.round(ms / 100);
+  if (tenths < 600) return `${(tenths / 10).toFixed(1)}s`;
+  const minutes = Math.floor(tenths / 600);
+  return `${minutes}m ${((tenths - minutes * 600) / 10).toFixed(1)}s`;
 }
 
 /**