diff --git a/internal/web/static/app.css b/internal/web/static/app.css
index ca0fb02..b9f5ea1 100644
--- a/internal/web/static/app.css
+++ b/internal/web/static/app.css
@@ -773,7 +773,7 @@ kbd {
    too alike down a column to read, so a day carries an initial in that
    person's colour and the legend underneath says whose. A shift is then a run
    of one colour, which is the shape the question actually has. */
-.rota-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; padding: 10px; }
+.rota-grid { display: grid; grid-template-columns: 2.4em repeat(7, 1fr); gap: 2px; padding: 10px; }
 .rota-wd {
   padding-bottom: 4px; text-align: center;
   color: var(--muted); font-size: 11px; font-weight: 700;
@@ -787,6 +787,21 @@ kbd {
 }
 button.rota-day { cursor: pointer; }
 button.rota-day:hover { background: var(--surface-2); }
+/* The week number starts each row. Quiet by default, because it is a label
+   first; an owner's tap on it is the second thing it does. */
+.rota-week {
+  display: grid; place-items: center;
+  border: 0; border-radius: var(--radius-sm); background: none;
+  font: inherit; font-size: 12px; font-variant-numeric: tabular-nums;
+  color: var(--faint);
+}
+button.rota-week { cursor: pointer; }
+button.rota-week:hover { background: var(--surface-2); color: var(--text); }
+.rota-week.current { color: var(--accent); font-weight: 700; }
+/* The sheet's row of who holds each day of the week. */
+.week-holders { display: flex; justify-content: space-between; gap: 4px; margin: 4px 0 12px; }
+.week-holder { display: flex; flex-direction: column; align-items: center; gap: 4px; flex: 1; }
+.week-holder.past { opacity: 0.55; }
 .rota-num { color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
 .rota-day.today { background: var(--accent-soft); }
 .rota-day.today .rota-num { color: var(--accent); font-weight: 700; }
diff --git a/internal/web/static/js/format.js b/internal/web/static/js/format.js
index 1cbed84..c50ba1e 100644
--- a/internal/web/static/js/format.js
+++ b/internal/web/static/js/format.js
@@ -66,6 +66,16 @@ export function mondayOf(d) {
   return r;
 }
 
+// ISO 8601 week number: weeks start on Monday and week 1 is the one holding the
+// year's first Thursday, which is what a rota that runs Monday to Sunday means
+// by "week 40". Taken from the Thursday of d's week, whose year is the week's.
+export function isoWeek(d) {
+  const thu = new Date(d.getFullYear(), d.getMonth(), d.getDate());
+  thu.setDate(thu.getDate() + 3 - ((thu.getDay() + 6) % 7));
+  const jan4 = new Date(thu.getFullYear(), 0, 4);
+  return 1 + Math.round(((thu - jan4) / 86400000 - 3 + ((jan4.getDay() + 6) % 7)) / 7);
+}
+
 export function addDays(d, n) {
   const r = new Date(d);
   r.setDate(r.getDate() + n);
diff --git a/internal/web/static/js/team.js b/internal/web/static/js/team.js
index 2a2f366..e8bf3aa 100644
--- a/internal/web/static/js/team.js
+++ b/internal/web/static/js/team.js
@@ -20,7 +20,7 @@
 import * as api from './api.js';
 import { h, clear, spinner, confirm, icon, openSheet, closeSheet, menuCard, badge, labelChip } from './ui.js';
 import { state, currentTeam, users as allUsers, myID } from './state.js';
-import { isoDate, addDays, mondayOf, initial, ago, when, duration } from './format.js';
+import { isoDate, addDays, mondayOf, isoWeek, initial, ago, when, duration } from './format.js';
 
 const view = () => document.getElementById('view-team');
 
@@ -240,6 +240,7 @@ function overview() {
 
 const monthFmt = new Intl.DateTimeFormat(undefined, { month: 'long', year: 'numeric' });
 const weekdayFmt = new Intl.DateTimeFormat(undefined, { weekday: 'short' });
+const dayShortFmt = new Intl.DateTimeFormat(undefined, { day: 'numeric', month: 'short' });
 const longDayFmt = new Intl.DateTimeFormat(undefined, {
   weekday: 'long', day: 'numeric', month: 'long',
 });
@@ -281,11 +282,14 @@ function scheduleCard() {
     const key = isoDate(d);
     const e = byDate.get(key);
     const inMonth = d.getMonth() === month;
+    // Every row starts with its week number, which is also the way to fill the
+    // whole week at once.
+    if (i % 7 === 0) cells.push(weekCell(d, byDate, today));
     if (inMonth && e && !seen.has(e.user_id)) seen.set(e.user_id, e.username);
     cells.push(dayCell(d, key, e, inMonth, today));
   }
 
-  const heads = [];
+  const heads = [h('span', { class: 'rota-wd', title: 'ISO week number', text: 'Wk' })];
   for (let i = 0; i < 7; i++) {
     // Any Monday will do; this one is a Monday.
     heads.push(h('span', { class: 'rota-wd', text: weekdayFmt.format(new Date(2024, 0, 1 + i)) }));
@@ -323,6 +327,23 @@ function scheduleCard() {
   ];
 }
 
+// The ISO week number at the start of a row. For an owner it is a button: one
+// tap fills the week, which is the way a rota is usually handed out — a person
+// takes a week, not seven separate days.
+function weekCell(monday, byDate, today) {
+  const n = isoWeek(monday);
+  const current = isoDate(monday) <= today && today < isoDate(addDays(monday, 7));
+  const cls = `rota-week${current ? ' current' : ''}`;
+  const label = `Week ${n}`;
+  return isOwner()
+    ? h('button', {
+      class: cls, type: 'button', text: String(n),
+      title: `${label} · assign somebody for the whole week`, 'aria-label': label,
+      onclick: () => weekSheet(monday, byDate),
+    })
+    : h('div', { class: cls, title: label, text: String(n) });
+}
+
 function dayCell(d, key, e, inMonth, today) {
   const cls = ['rota-day', !inMonth && 'outside', key === today && 'today', key < today && 'past']
     .filter(Boolean).join(' ');
@@ -378,6 +399,73 @@ function coverNote(byDate) {
     ' left this month with nobody on call.');
 }
 
+// One week, in the sheet: who holds each day of it, and one person to put on
+// all of them. Days already gone are left alone — who was on call last Tuesday
+// is a fact, and "the whole week" should not rewrite it — and the week's
+// overhang into the next month is included, since it is the same week.
+function weekSheet(monday, byDate) {
+  const today = isoDate(new Date());
+  const days = Array.from({ length: 7 }, (_, i) => addDays(monday, i));
+  const keys = days.map(isoDate);
+  const ahead = keys.filter((k) => k >= today);
+  const range = `${dayShortFmt.format(days[0])} – ${dayShortFmt.format(days[6])}`;
+
+  const who = memberSelect();
+  const onlyEmpty = h('input', { type: 'checkbox' });
+  const problem = h('p', { class: 'load-error', hidden: true });
+
+  const holders = h('div', { class: 'week-holders' }, days.map((d, i) => {
+    const e = byDate.get(keys[i]);
+    return h('span', {
+      class: `week-holder${keys[i] < today ? ' past' : ''}`,
+      title: `${keys[i]} · ${e ? e.username : 'nobody'}`,
+    },
+    h('span', { class: 'rota-num', text: weekdayFmt.format(d) }),
+    e
+      ? h('span', { class: `rota-chip ${colorClass(e.user_id)}`, text: initial(e.username) })
+      : h('span', { class: 'rota-chip none' }));
+  }));
+
+  openSheet(() => [
+    h('h2', { class: 'sheet-title', text: `Week ${isoWeek(monday)}` }),
+    h('p', { class: 'sheet-text', text: range }),
+    holders,
+    ahead.length
+      ? [
+        h('label', { class: 'sheet-pick' }, 'On call ', who),
+        h('label', { class: 'checkbox' }, onlyEmpty, ' Only fill days nobody has yet'),
+        h('p', { class: 'muted small' },
+          ahead.length < 7
+            ? `Days already past are left alone, so this covers the ${ahead.length} still to come. `
+            : '',
+          'Anybody already on those days is replaced unless you tick the box.'),
+      ]
+      : h('p', { class: 'muted', text: 'This whole week is already over.' }),
+    problem,
+    h('div', { class: 'sheet-actions' },
+      h('button', { class: 'btn', type: 'button', text: 'Cancel', onclick: () => closeSheet() }),
+      ahead.length > 0 && h('button', {
+        class: 'btn btn-primary', type: 'button', autofocus: true, text: 'Assign week',
+        onclick: () => {
+          const dates = onlyEmpty.checked ? ahead.filter((k) => !byDate.has(k)) : ahead;
+          if (!who.value) {
+            problem.textContent = 'There is nobody in this team to assign.';
+            problem.hidden = false;
+            return;
+          }
+          if (!dates.length) {
+            problem.textContent = 'Every day still to come already has somebody.';
+            problem.hidden = false;
+            return;
+          }
+          closeSheet();
+          act(() => api.assignSchedule(teamID, Number(who.value), dates, !onlyEmpty.checked));
+        },
+      }),
+    ),
+  ]);
+}
+
 // One day, in the sheet: who has it, who should, and the way to empty it. This
 // is where the per-row Clear button went — the grid has no room for thirty of
 // them, and the day you want to change is the one you just tapped.