diff --git a/docs/PLAN.md b/docs/PLAN.md
index ff11e9c..5d8c780 100644
--- a/docs/PLAN.md
+++ b/docs/PLAN.md
@@ -49,3 +49,4 @@ Updated: 2026-04-02
 32. Restored proxy-link copying for plain-`http` deployments by falling back from the Clipboard API to `execCommand('copy')`, and added regression coverage for both clipboard paths.
 33. Replaced stale startup mock values with explicit skeleton loading states so the shell no longer flashes fallback dashboard/users/settings data before the first live snapshot arrives.
 34. Renamed the tracked Docker Compose file to `compose.example.yml` and ignored local `compose.yml` so production-specific compose settings no longer get overwritten by pulls.
+35. Expanded byte formatting to cover `KB` through `PB`, improving dashboard totals, user usage, and quota remainder readability for both small and very large traffic values.
diff --git a/docs/PROJECT_INDEX.md b/docs/PROJECT_INDEX.md
index d623745..96c65fe 100644
--- a/docs/PROJECT_INDEX.md
+++ b/docs/PROJECT_INDEX.md
@@ -28,8 +28,8 @@ Updated: 2026-04-02
 - `src/App.test.tsx`: login-gate, startup skeleton, preferences persistence, hash-tab restoration, websocket-sync safety, reconnect/logout fallback handling, clipboard fallback coverage, generated-credential/create-edit modal flows, runtime stop, pause/resume, delete-confirm, and settings-save UI tests
 - `src/app.css`: full panel styling including fixed-width icon action buttons, busy-state treatment, startup skeleton shimmer states, and connection banner styling
 - `src/data/mockDashboard.ts`: default panel state and frontend fallback snapshot
-- `src/lib/3proxy.ts`: formatting and status helpers
-- `src/lib/3proxy.test.ts`: paranoia-oriented tests for core domain rules
+- `src/lib/3proxy.ts`: formatting and status helpers, including byte scaling from `B` through `PB`
+- `src/lib/3proxy.test.ts`: paranoia-oriented tests for core domain rules and byte-format scaling boundaries
 - `src/lib/panelPreferences.ts`: `localStorage`-backed panel language/theme preferences plus theme application helpers with `system` as the default theme
 - `src/lib/panelText.ts`: English/Russian UI text catalog for the panel shell, user-edit actions, runtime controls, last-seen labels, and connection recovery notices
 - `src/shared/contracts.ts`: shared panel, service, user, and API data contracts including per-user last-seen metadata
diff --git a/src/lib/3proxy.test.ts b/src/lib/3proxy.test.ts
index 27e9819..0b7c655 100644
--- a/src/lib/3proxy.test.ts
+++ b/src/lib/3proxy.test.ts
@@ -13,10 +13,16 @@ describe('formatBytes', () => {
     expect(formatBytes(-50)).toBe('0 B');
   });
 
-  it('formats megabytes and gigabytes with stable precision', () => {
+  it('formats kilobytes, megabytes, and gigabytes with stable precision', () => {
+    expect(formatBytes(122589)).toBe('119.7 KB');
     expect(formatBytes(10 * 1024 * 1024)).toBe('10.0 MB');
     expect(formatBytes(2.5 * 1024 * 1024 * 1024)).toBe('2.50 GB');
   });
+
+  it('scales cleanly through terabytes and petabytes', () => {
+    expect(formatBytes(3.2 * 1024 ** 4)).toBe('3.20 TB');
+    expect(formatBytes(1.25 * 1024 ** 5)).toBe('1.25 PB');
+  });
 });
 
 describe('buildProxyLink', () => {
diff --git a/src/lib/3proxy.ts b/src/lib/3proxy.ts
index ebfc0d3..55e5cc9 100644
--- a/src/lib/3proxy.ts
+++ b/src/lib/3proxy.ts
@@ -1,5 +1,4 @@
-const MB = 1024 * 1024;
-const GB = MB * 1024;
+const BYTE_UNITS = ['B', 'KB', 'MB', 'GB', 'TB', 'PB'] as const;
 
 export type ServiceState = 'live' | 'warn' | 'fail' | 'idle' | 'paused';
 
@@ -8,15 +7,20 @@ export function formatBytes(value: number): string {
     return '0 B';
   }
 
-  if (value >= GB) {
-    return `${(value / GB).toFixed(2)} GB`;
+  if (value < 1024) {
+    return `${Math.round(value)} B`;
   }
 
-  if (value >= MB) {
-    return `${(value / MB).toFixed(1)} MB`;
+  let unitIndex = 0;
+  let scaled = value;
+
+  while (scaled >= 1024 && unitIndex < BYTE_UNITS.length - 1) {
+    scaled /= 1024;
+    unitIndex += 1;
   }
 
-  return `${Math.round(value)} B`;
+  const decimals = scaled >= 10 ? 1 : 2;
+  return `${scaled.toFixed(decimals)} ${BYTE_UNITS[unitIndex]}`;
 }
 
 export function buildProxyLink(