diff --git a/frontend/src/components/BillingModal.jsx b/frontend/src/components/BillingModal.jsx
index fa765c3..0b4c499 100644
--- a/frontend/src/components/BillingModal.jsx
+++ b/frontend/src/components/BillingModal.jsx
@@ -18,15 +18,6 @@ const TABS = [
   { id: 'events',  label: 'Event log',      icon: FiList },
 ];
 
-const formatBytes = (n) => {
-  n = Number(n || 0);
-  if (n <= 0) return '0 B';
-  const u = ['B', 'KB', 'MB', 'GB', 'TB'];
-  let i = 0;
-  while (n >= 1024 && i < u.length - 1) { n /= 1024; i++; }
-  return `${n.toFixed(n >= 10 || i === 0 ? 0 : 1)} ${u[i]}`;
-};
-
 const currentYm = () => {
   const d = new Date();
   return `${d.getUTCFullYear()}-${String(d.getUTCMonth() + 1).padStart(2, '0')}`;
@@ -353,9 +344,8 @@ const VolumeView = ({ volume, domain, ymFilter }) => {
         <div className="text-xs uppercase tracking-wide text-primary-700 font-semibold">
           {domain} · {monthLabel}
         </div>
-        <div className="mt-2 grid grid-cols-2 sm:grid-cols-4 gap-4">
+        <div className="mt-2 grid grid-cols-1 sm:grid-cols-3 gap-4">
           <Stat label="Sent"       value={volume.send_count.toLocaleString()} icon={FiSend} />
-          <Stat label="Total size" value={formatBytes(volume.bytes_total)}    icon={null} />
           <Stat
             label="Bounces"
             value={volume.bounce_count.toLocaleString()}
@@ -383,7 +373,6 @@ const VolumeView = ({ volume, domain, ymFilter }) => {
               <tr className="text-left text-xs uppercase tracking-wide text-gray-500 border-b border-gray-200">
                 <th className="py-2 pr-4 font-semibold">Mailbox</th>
                 <th className="py-2 pr-4 font-semibold text-right">Sent</th>
-                <th className="py-2 pr-4 font-semibold text-right">Size</th>
                 <th className="py-2 pr-4 font-semibold text-right">Bounces</th>
                 <th className="py-2 pr-4 font-semibold text-right">Complaints</th>
               </tr>
@@ -403,7 +392,6 @@ const VolumeView = ({ volume, domain, ymFilter }) => {
                     </div>
                   </td>
                   <td className="py-2 pr-4 text-right font-mono">{v.send_count.toLocaleString()}</td>
-                  <td className="py-2 pr-4 text-right font-mono text-gray-600">{formatBytes(v.bytes_total)}</td>
                   <td className={`py-2 pr-4 text-right font-mono ${v.bounce_count > 0 ? 'text-amber-700' : 'text-gray-400'}`}>
                     {v.bounce_count.toLocaleString()}
                   </td>