diff --git a/crates/frontend/public/assets/style.css b/crates/frontend/public/assets/style.css
index 2cd0e3d..95ee5dc 100644
--- a/crates/frontend/public/assets/style.css
+++ b/crates/frontend/public/assets/style.css
@@ -202,14 +202,16 @@ ul.collection-list {
       background: color-mix(in srgb, var(--background-color), var(--dilute-color) 5%);
       display: grid;
       min-height: 80px;
+      height: fit-content;
       grid-template-areas:
         ".                .                 color-chip"
         "title            comps             color-chip"
         "description      description       color-chip"
         "subscription-url subscription-url  color-chip"
+        "metadata         metadata          color-chip"
         "actions          actions           color-chip"
         ".                .                 color-chip";
-      grid-template-rows: 12px auto auto auto auto 12px;
+      grid-template-rows: 12px auto auto auto auto auto 12px;
       grid-template-columns: min-content auto 80px;
       row-gap: 4px;
       color: inherit;
@@ -251,6 +253,11 @@ ul.collection-list {
         white-space: nowrap;
       }
 
+      .metadata {
+        grid-area: metadata;
+        white-space: nowrap;
+      }
+
       .subscription-url {
         grid-area: subscription-url;
         white-space: nowrap;
diff --git a/crates/frontend/public/templates/components/sections/addressbooks_section.html b/crates/frontend/public/templates/components/sections/addressbooks_section.html
index 94245c7..1371ce8 100644
--- a/crates/frontend/public/templates/components/sections/addressbooks_section.html
+++ b/crates/frontend/public/templates/components/sections/addressbooks_section.html
@@ -1,6 +1,6 @@
 <h2>{{user.id }}'s Addressbooks</h2>
 <ul class="collection-list">
-  {% for addressbook in addressbooks %}
+  {% for (meta, addressbook) in addressbooks %}
   <li class="collection-list-item">
     <a href="/frontend/user/{{ addressbook.principal }}/addressbook/{{ addressbook.id}}">
       <span class="title">
@@ -18,6 +18,9 @@
         <delete-button trash
           href="/carddav/principal/{{ addressbook.principal }}/{{ addressbook.id }}"></delete-button>
       </div>
+      <div class="metadata">
+        {{ meta.len }} objects, {{ meta.deleted_len }} deleted objects
+      </div>
     </a>
   </li>
   {% else %}
@@ -27,7 +30,7 @@
 {%if !deleted_addressbooks.is_empty() %}
 <h3>Deleted Addressbooks</h3>
 <ul class="collection-list">
-  {% for addressbook in deleted_addressbooks %}
+  {% for (meta, addressbook) in deleted_addressbooks %}
   <li class="collection-list-item">
     <a href="/frontend/user/{{ addressbook.principal }}/addressbook/{{ addressbook.id}}">
       <span class="title">
@@ -44,6 +47,9 @@
         </form>
         <delete-button href="/carddav/principal/{{ addressbook.principal }}/{{ addressbook.id }}"></delete-button>
       </div>
+      <div class="metadata">
+        {{ meta.len }} objects, {{ meta.deleted_len }} deleted objects
+      </div>
     </a>
   </li>
   {% endfor %}
diff --git a/crates/frontend/public/templates/components/sections/calendars_section.html b/crates/frontend/public/templates/components/sections/calendars_section.html
index 50a1c04..93096ae 100644
--- a/crates/frontend/public/templates/components/sections/calendars_section.html
+++ b/crates/frontend/public/templates/components/sections/calendars_section.html
@@ -1,6 +1,6 @@
 <h2>{{ user.id }}'s Calendars</h2>
 <ul class="collection-list">
-  {% for calendar in calendars %}
+  {% for (meta, calendar) in calendars %}
   {% let color = calendar.color.to_owned().unwrap_or("transparent".to_owned()) %}
   <li class="collection-list-item" style="--color: {{ color }}">
     <a href="/frontend/user/{{ calendar.principal }}/calendar/{{ calendar.id }}">
@@ -27,6 +27,9 @@
         <delete-button trash href="/caldav/principal/{{ calendar.principal }}/{{ calendar.id }}"></delete-button>
         {% endif %}
       </div>
+      <div class="metadata">
+        {{ meta.len }} objects, {{ meta.deleted_len }} deleted objects
+      </div>
       <div class="color-chip"></div>
     </a>
   </li>
@@ -37,7 +40,7 @@
 {%if !deleted_calendars.is_empty() %}
 <h3>Deleted Calendars</h3>
 <ul class="collection-list">
-  {% for calendar in deleted_calendars %}
+  {% for (meta, calendar) in deleted_calendars %}
   {% let color = calendar.color.to_owned().unwrap_or("transparent".to_owned()) %}
   <li class="collection-list-item" style="--color: {{ color }}">
     <a href="/frontend/user/{{ calendar.principal }}/calendar/{{ calendar.id}}">
@@ -60,6 +63,9 @@
         </form>
         <delete-button href="/caldav/principal/{{ calendar.principal }}/{{ calendar.id }}"></delete-button>
       </div>
+      <div class="metadata">
+        {{ meta.len }} objects, {{ meta.deleted_len }} deleted objects
+      </div>
       <div class="color-chip"></div>
     </a>
   </li>
diff --git a/crates/frontend/src/routes/addressbooks.rs b/crates/frontend/src/routes/addressbooks.rs
index 2e41a6f..f0707fc 100644
--- a/crates/frontend/src/routes/addressbooks.rs
+++ b/crates/frontend/src/routes/addressbooks.rs
@@ -4,7 +4,7 @@ use askama::Template;
 use askama_web::WebTemplate;
 use axum::{Extension, extract::Path, response::IntoResponse};
 use http::StatusCode;
-use rustical_store::{Addressbook, AddressbookStore, auth::Principal};
+use rustical_store::{Addressbook, AddressbookStore, CollectionMetadata, auth::Principal};
 
 use crate::pages::user::{Section, UserPage};
 
@@ -18,8 +18,8 @@ impl Section for AddressbooksSection {
 #[template(path = "components/sections/addressbooks_section.html")]
 pub struct AddressbooksSection {
     pub user: Principal,
-    pub addressbooks: Vec<Addressbook>,
-    pub deleted_addressbooks: Vec<Addressbook>,
+    pub addressbooks: Vec<(CollectionMetadata, Addressbook)>,
+    pub deleted_addressbooks: Vec<(CollectionMetadata, Addressbook)>,
 }
 
 pub async fn route_addressbooks<AS: AddressbookStore>(
@@ -41,11 +41,33 @@ pub async fn route_addressbooks<AS: AddressbookStore>(
         deleted_addressbooks.extend(addr_store.get_deleted_addressbooks(group).await.unwrap());
     }
 
+    let mut addressbook_infos = vec![];
+    for addressbook in addressbooks {
+        addressbook_infos.push((
+            addr_store
+                .addressbook_metadata(&addressbook.principal, &addressbook.id)
+                .await
+                .unwrap(),
+            addressbook,
+        ));
+    }
+
+    let mut deleted_addressbook_infos = vec![];
+    for addressbook in deleted_addressbooks {
+        deleted_addressbook_infos.push((
+            addr_store
+                .addressbook_metadata(&addressbook.principal, &addressbook.id)
+                .await
+                .unwrap(),
+            addressbook,
+        ));
+    }
+
     UserPage {
         section: AddressbooksSection {
             user: user.clone(),
-            addressbooks,
-            deleted_addressbooks,
+            addressbooks: addressbook_infos,
+            deleted_addressbooks: deleted_addressbook_infos,
         },
         user,
     }
diff --git a/crates/frontend/src/routes/calendars.rs b/crates/frontend/src/routes/calendars.rs
index 7cebc29..b440858 100644
--- a/crates/frontend/src/routes/calendars.rs
+++ b/crates/frontend/src/routes/calendars.rs
@@ -5,7 +5,7 @@ use askama::Template;
 use askama_web::WebTemplate;
 use axum::{Extension, extract::Path, response::IntoResponse};
 use http::StatusCode;
-use rustical_store::{Calendar, CalendarStore, auth::Principal};
+use rustical_store::{Calendar, CalendarStore, CollectionMetadata, auth::Principal};
 
 impl Section for CalendarsSection {
     fn name() -> &'static str {
@@ -17,8 +17,8 @@ impl Section for CalendarsSection {
 #[template(path = "components/sections/calendars_section.html")]
 pub struct CalendarsSection {
     pub user: Principal,
-    pub calendars: Vec<Calendar>,
-    pub deleted_calendars: Vec<Calendar>,
+    pub calendars: Vec<(CollectionMetadata, Calendar)>,
+    pub deleted_calendars: Vec<(CollectionMetadata, Calendar)>,
 }
 
 pub async fn route_calendars<CS: CalendarStore>(
@@ -35,16 +35,38 @@ pub async fn route_calendars<CS: CalendarStore>(
         calendars.extend(cal_store.get_calendars(group).await.unwrap());
     }
 
+    let mut calendar_infos = vec![];
+    for calendar in calendars {
+        calendar_infos.push((
+            cal_store
+                .calendar_metadata(&calendar.principal, &calendar.id)
+                .await
+                .unwrap(),
+            calendar,
+        ));
+    }
+
     let mut deleted_calendars = vec![];
     for group in user.memberships() {
         deleted_calendars.extend(cal_store.get_deleted_calendars(group).await.unwrap());
     }
 
+    let mut deleted_calendar_infos = vec![];
+    for calendar in deleted_calendars {
+        deleted_calendar_infos.push((
+            cal_store
+                .calendar_metadata(&calendar.principal, &calendar.id)
+                .await
+                .unwrap(),
+            calendar,
+        ));
+    }
+
     UserPage {
         section: CalendarsSection {
             user: user.clone(),
-            calendars,
-            deleted_calendars,
+            calendars: calendar_infos,
+            deleted_calendars: deleted_calendar_infos,
         },
         user,
     }
diff --git a/crates/store/src/addressbook_store.rs b/crates/store/src/addressbook_store.rs
index 5453703..1fff3ee 100644
--- a/crates/store/src/addressbook_store.rs
+++ b/crates/store/src/addressbook_store.rs
@@ -1,4 +1,4 @@
-use crate::{Error, addressbook::Addressbook};
+use crate::{CollectionMetadata, Error, addressbook::Addressbook};
 use async_trait::async_trait;
 use rustical_ical::AddressObject;
 
@@ -35,6 +35,12 @@ pub trait AddressbookStore: Send + Sync + 'static {
         synctoken: i64,
     ) -> Result<(Vec<AddressObject>, Vec<String>, i64), Error>;
 
+    async fn addressbook_metadata(
+        &self,
+        principal: &str,
+        addressbook_id: &str,
+    ) -> Result<CollectionMetadata, Error>;
+
     async fn get_objects(
         &self,
         principal: &str,
diff --git a/crates/store/src/calendar_store.rs b/crates/store/src/calendar_store.rs
index ffed079..c01c217 100644
--- a/crates/store/src/calendar_store.rs
+++ b/crates/store/src/calendar_store.rs
@@ -1,4 +1,4 @@
-use crate::{Calendar, error::Error};
+use crate::{Calendar, CollectionMetadata, error::Error};
 use async_trait::async_trait;
 use chrono::NaiveDate;
 use rustical_ical::CalendarObject;
@@ -53,6 +53,12 @@ pub trait CalendarStore: Send + Sync + 'static {
         self.get_objects(principal, cal_id).await
     }
 
+    async fn calendar_metadata(
+        &self,
+        principal: &str,
+        cal_id: &str,
+    ) -> Result<CollectionMetadata, Error>;
+
     async fn get_objects(
         &self,
         principal: &str,
diff --git a/crates/store/src/combined_calendar_store.rs b/crates/store/src/combined_calendar_store.rs
index b86c527..841bfb8 100644
--- a/crates/store/src/combined_calendar_store.rs
+++ b/crates/store/src/combined_calendar_store.rs
@@ -135,6 +135,20 @@ impl<CS: CalendarStore, BS: CalendarStore> CalendarStore for CombinedCalendarSto
         }
     }
 
+    #[inline]
+    async fn calendar_metadata(
+        &self,
+        principal: &str,
+        cal_id: &str,
+    ) -> Result<crate::CollectionMetadata, Error> {
+        if cal_id.starts_with(BIRTHDAYS_PREFIX) {
+            self.birthday_store
+                .calendar_metadata(principal, cal_id)
+                .await
+        } else {
+            self.cal_store.calendar_metadata(principal, cal_id).await
+        }
+    }
     #[inline]
     async fn get_objects(
         &self,
diff --git a/crates/store/src/contact_birthday_store.rs b/crates/store/src/contact_birthday_store.rs
index ef24e57..cbfde40 100644
--- a/crates/store/src/contact_birthday_store.rs
+++ b/crates/store/src/contact_birthday_store.rs
@@ -16,7 +16,7 @@ fn birthday_calendar(addressbook: Addressbook) -> Calendar {
         id: format!("{}{}", BIRTHDAYS_PREFIX, addressbook.id),
         displayname: addressbook
             .displayname
-            .map(|name| format!("{} birthdays", name)),
+            .map(|name| format!("{name} birthdays")),
         order: 0,
         description: None,
         color: None,
@@ -104,6 +104,17 @@ impl<AS: AddressbookStore> CalendarStore for ContactBirthdayStore<AS> {
         Ok((objects, deleted_objects, new_synctoken))
     }
 
+    async fn calendar_metadata(
+        &self,
+        principal: &str,
+        cal_id: &str,
+    ) -> Result<crate::CollectionMetadata, Error> {
+        let cal_id = cal_id
+            .strip_prefix(BIRTHDAYS_PREFIX)
+            .ok_or(Error::NotFound)?;
+        self.0.addressbook_metadata(principal, cal_id).await
+    }
+
     async fn get_objects(
         &self,
         principal: &str,
diff --git a/crates/store/src/lib.rs b/crates/store/src/lib.rs
index 36e9a50..d761193 100644
--- a/crates/store/src/lib.rs
+++ b/crates/store/src/lib.rs
@@ -37,3 +37,11 @@ pub struct CollectionOperation {
     pub topic: String,
     pub data: CollectionOperationInfo,
 }
+
+#[derive(Default, Debug, Clone)]
+pub struct CollectionMetadata {
+    pub len: usize,
+    pub deleted_len: usize,
+    pub size: u64,
+    pub deleted_size: u64,
+}
diff --git a/crates/store/src/synctoken.rs b/crates/store/src/synctoken.rs
index 5d1b46e..67425bf 100644
--- a/crates/store/src/synctoken.rs
+++ b/crates/store/src/synctoken.rs
@@ -1,7 +1,7 @@
 const SYNC_NAMESPACE: &str = "github.com/lennart-k/rustical/ns/";
 
 pub fn format_synctoken(synctoken: i64) -> String {
-    format!("{}{}", SYNC_NAMESPACE, synctoken)
+    format!("{SYNC_NAMESPACE}{synctoken}")
 }
 
 pub fn parse_synctoken(synctoken: &str) -> Option<i64> {
diff --git a/crates/store_sqlite/src/addressbook_store.rs b/crates/store_sqlite/src/addressbook_store.rs
index 1566be9..eec49e6 100644
--- a/crates/store_sqlite/src/addressbook_store.rs
+++ b/crates/store_sqlite/src/addressbook_store.rs
@@ -3,8 +3,8 @@ use async_trait::async_trait;
 use derive_more::derive::Constructor;
 use rustical_ical::AddressObject;
 use rustical_store::{
-    Addressbook, AddressbookStore, CollectionOperation, CollectionOperationInfo, Error,
-    synctoken::format_synctoken,
+    Addressbook, AddressbookStore, CollectionMetadata, CollectionOperation,
+    CollectionOperationInfo, Error, synctoken::format_synctoken,
 };
 use sqlx::{Acquire, Executor, Sqlite, SqlitePool, Transaction};
 use tokio::sync::mpsc::Sender;
@@ -223,6 +223,28 @@ impl SqliteAddressbookStore {
         Ok((objects, deleted_objects, new_synctoken))
     }
 
+    async fn _list_objects<'e, E: Executor<'e, Database = Sqlite>>(
+        executor: E,
+        principal: &str,
+        addressbook_id: &str,
+    ) -> Result<Vec<(u64, bool)>, rustical_store::Error> {
+        struct ObjectEntry {
+            length: u64,
+            deleted: bool,
+        }
+        Ok(sqlx::query_as!(
+            ObjectEntry,
+            "SELECT length(vcf) AS 'length!: u64', deleted_at AS 'deleted!: bool' FROM addressobjects WHERE principal = ? AND addressbook_id = ?",
+            principal,
+            addressbook_id
+        )
+        .fetch_all(executor)
+        .await.map_err(crate::Error::from)?
+        .into_iter()
+        .map(|row| (row.length, row.deleted))
+        .collect())
+    }
+
     async fn _get_objects<'e, E: Executor<'e, Database = Sqlite>>(
         executor: E,
         principal: &str,
@@ -442,6 +464,29 @@ impl AddressbookStore for SqliteAddressbookStore {
         Self::_sync_changes(&self.db, principal, addressbook_id, synctoken).await
     }
 
+    #[instrument]
+    async fn addressbook_metadata(
+        &self,
+        principal: &str,
+        addressbook_id: &str,
+    ) -> Result<CollectionMetadata, rustical_store::Error> {
+        let mut sizes = vec![];
+        let mut deleted_sizes = vec![];
+        for (size, deleted) in Self::_list_objects(&self.db, principal, addressbook_id).await? {
+            if deleted {
+                deleted_sizes.push(size)
+            } else {
+                sizes.push(size)
+            }
+        }
+        Ok(CollectionMetadata {
+            len: sizes.len(),
+            deleted_len: deleted_sizes.len(),
+            size: sizes.iter().sum(),
+            deleted_size: deleted_sizes.iter().sum(),
+        })
+    }
+
     #[instrument]
     async fn get_objects(
         &self,
diff --git a/crates/store_sqlite/src/calendar_store.rs b/crates/store_sqlite/src/calendar_store.rs
index 218919f..5b02786 100644
--- a/crates/store_sqlite/src/calendar_store.rs
+++ b/crates/store_sqlite/src/calendar_store.rs
@@ -5,7 +5,7 @@ use derive_more::derive::Constructor;
 use rustical_ical::{CalDateTime, CalendarObject, CalendarObjectType};
 use rustical_store::calendar_store::CalendarQuery;
 use rustical_store::synctoken::format_synctoken;
-use rustical_store::{Calendar, CalendarStore, Error};
+use rustical_store::{Calendar, CalendarStore, CollectionMetadata, Error};
 use rustical_store::{CollectionOperation, CollectionOperationInfo};
 use sqlx::types::chrono::NaiveDateTime;
 use sqlx::{Acquire, Executor, Sqlite, SqlitePool, Transaction};
@@ -242,6 +242,28 @@ impl SqliteCalendarStore {
         Ok(())
     }
 
+    async fn _list_objects<'e, E: Executor<'e, Database = Sqlite>>(
+        executor: E,
+        principal: &str,
+        cal_id: &str,
+    ) -> Result<Vec<(u64, bool)>, rustical_store::Error> {
+        struct ObjectEntry {
+            length: u64,
+            deleted: bool,
+        }
+        Ok(sqlx::query_as!(
+            ObjectEntry,
+            "SELECT length(ics) AS 'length!: u64', deleted_at AS 'deleted!: bool' FROM calendarobjects WHERE principal = ? AND cal_id = ?",
+            principal,
+            cal_id
+        )
+        .fetch_all(executor)
+        .await.map_err(crate::Error::from)?
+        .into_iter()
+        .map(|row| (row.length, row.deleted))
+        .collect())
+    }
+
     async fn _get_objects<'e, E: Executor<'e, Database = Sqlite>>(
         executor: E,
         principal: &str,
@@ -552,6 +574,28 @@ impl CalendarStore for SqliteCalendarStore {
         Self::_calendar_query(&self.db, principal, cal_id, query).await
     }
 
+    async fn calendar_metadata(
+        &self,
+        principal: &str,
+        cal_id: &str,
+    ) -> Result<CollectionMetadata, Error> {
+        let mut sizes = vec![];
+        let mut deleted_sizes = vec![];
+        for (size, deleted) in Self::_list_objects(&self.db, principal, cal_id).await? {
+            if deleted {
+                deleted_sizes.push(size)
+            } else {
+                sizes.push(size)
+            }
+        }
+        Ok(CollectionMetadata {
+            len: sizes.len(),
+            deleted_len: deleted_sizes.len(),
+            size: sizes.iter().sum(),
+            deleted_size: deleted_sizes.iter().sum(),
+        })
+    }
+
     #[instrument]
     async fn get_objects(
         &self,