diff --git a/all/build.gradle.kts b/all/build.gradle.kts
index f2dbc758..ad001da0 100644
--- a/all/build.gradle.kts
+++ b/all/build.gradle.kts
@@ -27,6 +27,8 @@ tasks.shadowJar {
     archiveFileName.set("openrs2.jar")
 
     minimize {
+        // currently only invoked with reflection in Thymeleaf templates
+        exclude(dependency("com.jakewharton.byteunits:byteunits"))
         exclude(dependency("org.jetbrains.kotlin:kotlin-reflect"))
     }
 }
diff --git a/archive/build.gradle.kts b/archive/build.gradle.kts
index f560b467..f213f7bc 100644
--- a/archive/build.gradle.kts
+++ b/archive/build.gradle.kts
@@ -23,6 +23,7 @@ dependencies {
     implementation(project(":util"))
     implementation(project(":yaml"))
     implementation("com.google.guava:guava:${Versions.guava}")
+    implementation("com.jakewharton.byteunits:byteunits:${Versions.byteUnits}")
     implementation("com.zaxxer:HikariCP:${Versions.hikaricp}")
     implementation("io.ktor:ktor-jackson:${Versions.ktor}")
     implementation("io.ktor:ktor-server-netty:${Versions.ktor}")
diff --git a/archive/src/main/kotlin/org/openrs2/archive/cache/CacheExporter.kt b/archive/src/main/kotlin/org/openrs2/archive/cache/CacheExporter.kt
index 83027c8f..51c4133a 100644
--- a/archive/src/main/kotlin/org/openrs2/archive/cache/CacheExporter.kt
+++ b/archive/src/main/kotlin/org/openrs2/archive/cache/CacheExporter.kt
@@ -25,7 +25,8 @@ public class CacheExporter @Inject constructor(
         val validGroups: Long,
         val groups: Long,
         val validKeys: Long,
-        val keys: Long
+        val keys: Long,
+        val size: Long
     ) {
         public val allIndexesValid: Boolean = indexes == validIndexes && indexes != 0L
         public val validIndexesFraction: Double = if (indexes == 0L) {
@@ -87,12 +88,14 @@ public class CacheExporter @Inject constructor(
                     ms.valid_groups,
                     ms.groups,
                     ms.valid_keys,
-                    ms.keys
+                    ms.keys,
+                    ms.size
                 FROM master_indexes m
                 JOIN sources s ON s.master_index_id = m.id
                 JOIN games g ON g.id = s.game_id
                 LEFT JOIN master_index_stats ms ON ms.master_index_id = m.id
-                GROUP BY m.id, g.name, ms.valid_indexes, ms.indexes, ms.valid_groups, ms.groups, ms.valid_keys, ms.keys
+                GROUP BY m.id, g.name, ms.valid_indexes, ms.indexes, ms.valid_groups, ms.groups, ms.valid_keys, ms.keys,
+                    ms.size
                 ORDER BY g.name ASC, MIN(s.build) ASC, MIN(s.timestamp) ASC
             """.trimIndent()
             ).use { stmt ->
@@ -113,7 +116,8 @@ public class CacheExporter @Inject constructor(
                             val groups = rows.getLong(9)
                             val validKeys = rows.getLong(10)
                             val keys = rows.getLong(11)
-                            Stats(validIndexes, indexes, validGroups, groups, validKeys, keys)
+                            val size = rows.getLong(12)
+                            Stats(validIndexes, indexes, validGroups, groups, validKeys, keys, size)
                         } else {
                             null
                         }
@@ -152,13 +156,14 @@ public class CacheExporter @Inject constructor(
                     ms.valid_groups,
                     ms.groups,
                     ms.valid_keys,
-                    ms.keys
+                    ms.keys,
+                    ms.size
                 FROM master_indexes m
                 JOIN sources s ON s.master_index_id = m.id
                 JOIN games g ON g.id = s.game_id
                 LEFT JOIN master_index_stats ms ON ms.master_index_id = m.id
                 WHERE m.id = ?
-                GROUP BY m.id, ms.valid_indexes, ms.indexes, ms.valid_groups, ms.groups, ms.valid_keys, ms.keys
+                GROUP BY m.id, ms.valid_indexes, ms.indexes, ms.valid_groups, ms.groups, ms.valid_keys, ms.keys, ms.size
             """.trimIndent()
             ).use { stmt ->
                 stmt.setInt(1, id)
@@ -182,7 +187,8 @@ public class CacheExporter @Inject constructor(
                         val groups = rows.getLong(10)
                         val validKeys = rows.getLong(11)
                         val keys = rows.getLong(12)
-                        Stats(validIndexes, indexes, validGroups, groups, validKeys, keys)
+                        val size = rows.getLong(13)
+                        Stats(validIndexes, indexes, validGroups, groups, validKeys, keys, size)
                     } else {
                         null
                     }
diff --git a/archive/src/main/resources/org/openrs2/archive/templates/caches/index.html b/archive/src/main/resources/org/openrs2/archive/templates/caches/index.html
index 55b92885..8e0b628e 100644
--- a/archive/src/main/resources/org/openrs2/archive/templates/caches/index.html
+++ b/archive/src/main/resources/org/openrs2/archive/templates/caches/index.html
@@ -22,6 +22,7 @@
 							<th>Indexes</th>
 							<th>Groups</th>
 							<th>Keys<sup><a href="#empty-locs">1</a></sup></th>
+							<th>Size<sup><a href="#size">2</a></sup></th>
 							<th>Links</th>
 						</tr>
 					</thead>
@@ -65,6 +66,9 @@
 								<span
 									th:text="${cache.stats}? '(' + ${#numbers.formatPercent(cache.stats.validKeysFraction, 1, 2)} + ')'"></span>
 							</td>
+							<td th:text="${cache.stats}? ${@com.jakewharton.byteunits.BinaryByteUnit@format(cache.stats.size)} : 'Calculating...'"
+							    class="text-right">Calculating...
+							</td>
 							<td>
 								<div class="btn-group">
 									<div class="btn-group">
@@ -107,6 +111,13 @@
 				be used to replace the empty encrypted loc groups with
 				unencrypted replacements.
 			</p>
+			<p>
+				<sup id="size">2</sup> Estimated based on the total compressed
+				length of all groups in the cache. The native
+				<code>.dat2</code>/<code>.idx</code> format has some overhead
+				above this, but the <code>.zip</code> file generated by the
+				archiving service will reduce the overhead.
+			</p>
 		</main>
 	</body>
 </html>
diff --git a/archive/src/main/resources/org/openrs2/archive/templates/caches/show.html b/archive/src/main/resources/org/openrs2/archive/templates/caches/show.html
index 269889d4..e7aa05fa 100644
--- a/archive/src/main/resources/org/openrs2/archive/templates/caches/show.html
+++ b/archive/src/main/resources/org/openrs2/archive/templates/caches/show.html
@@ -65,6 +65,12 @@
 						Calculating...
 					</td>
 				</tr>
+				<tr class="thead-dark">
+					<th>Size<sup><a href="/caches#size">2</a></sup></th>
+					<td th:text="${cache.stats}? ${@com.jakewharton.byteunits.BinaryByteUnit@format(cache.stats.size)} : 'Calculating...'">
+						Calculating...
+					</td>
+				</tr>
 				<tr class="thead-dark">
 					<th>Download</th>
 					<td>
diff --git a/buildSrc/src/main/kotlin/Versions.kt b/buildSrc/src/main/kotlin/Versions.kt
index 1d85ba73..4390269a 100644
--- a/buildSrc/src/main/kotlin/Versions.kt
+++ b/buildSrc/src/main/kotlin/Versions.kt
@@ -3,6 +3,7 @@ object Versions {
     const val bootstrap = "4.6.0-1"
     const val bouncyCastlePkix = "1.68"
     const val bouncyCastleProvider = "1.68"
+    const val byteUnits = "0.9.1"
     const val clikt = "3.1.0"
     const val commonsCompress = "1.20"
     const val dependencyLicenseReport = "1.16"