diff --git a/app/src/main/java/org/koitharu/kotatsu/bookmarks/data/BookmarkEntity.kt b/app/src/main/java/org/koitharu/kotatsu/bookmarks/data/BookmarkEntity.kt
index 0959b3362..1f348899b 100644
--- a/app/src/main/java/org/koitharu/kotatsu/bookmarks/data/BookmarkEntity.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/bookmarks/data/BookmarkEntity.kt
@@ -25,4 +25,5 @@ class BookmarkEntity(
 	@ColumnInfo(name = "scroll") val scroll: Int,
 	@ColumnInfo(name = "image") val imageUrl: String,
 	@ColumnInfo(name = "created_at") val createdAt: Long,
+	@ColumnInfo(name = "percent") val percent: Float,
 )
\ No newline at end of file
diff --git a/app/src/main/java/org/koitharu/kotatsu/bookmarks/data/EntityMapping.kt b/app/src/main/java/org/koitharu/kotatsu/bookmarks/data/EntityMapping.kt
index 981aa05ea..0ab69dd18 100644
--- a/app/src/main/java/org/koitharu/kotatsu/bookmarks/data/EntityMapping.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/bookmarks/data/EntityMapping.kt
@@ -18,6 +18,7 @@ fun BookmarkEntity.toBookmark(manga: Manga) = Bookmark(
 	scroll = scroll,
 	imageUrl = imageUrl,
 	createdAt = Date(createdAt),
+	percent = percent,
 )
 
 fun Bookmark.toEntity() = BookmarkEntity(
@@ -28,4 +29,5 @@ fun Bookmark.toEntity() = BookmarkEntity(
 	scroll = scroll,
 	imageUrl = imageUrl,
 	createdAt = createdAt.time,
+	percent = percent,
 )
\ No newline at end of file
diff --git a/app/src/main/java/org/koitharu/kotatsu/bookmarks/domain/Bookmark.kt b/app/src/main/java/org/koitharu/kotatsu/bookmarks/domain/Bookmark.kt
index 0b76c6537..5b6ff3bf0 100644
--- a/app/src/main/java/org/koitharu/kotatsu/bookmarks/domain/Bookmark.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/bookmarks/domain/Bookmark.kt
@@ -11,6 +11,7 @@ class Bookmark(
 	val scroll: Int,
 	val imageUrl: String,
 	val createdAt: Date,
+	val percent: Float,
 ) {
 
 	override fun equals(other: Any?): Boolean {
@@ -26,6 +27,7 @@ class Bookmark(
 		if (scroll != other.scroll) return false
 		if (imageUrl != other.imageUrl) return false
 		if (createdAt != other.createdAt) return false
+		if (percent != other.percent) return false
 
 		return true
 	}
@@ -38,6 +40,7 @@ class Bookmark(
 		result = 31 * result + scroll
 		result = 31 * result + imageUrl.hashCode()
 		result = 31 * result + createdAt.hashCode()
+		result = 31 * result + percent.hashCode()
 		return result
 	}
 }
\ No newline at end of file
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/backup/BackupRepository.kt b/app/src/main/java/org/koitharu/kotatsu/core/backup/BackupRepository.kt
index 4b42b4c60..7212b8569 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/backup/BackupRepository.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/backup/BackupRepository.kt
@@ -111,6 +111,7 @@ class BackupRepository(private val db: MangaDatabase) {
 		jo.put("chapter_id", chapterId)
 		jo.put("page", page)
 		jo.put("scroll", scroll)
+		jo.put("percent", percent)
 		return jo
 	}
 
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/backup/RestoreRepository.kt b/app/src/main/java/org/koitharu/kotatsu/core/backup/RestoreRepository.kt
index 57fd4d6ee..4e20b955f 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/backup/RestoreRepository.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/backup/RestoreRepository.kt
@@ -9,10 +9,7 @@ import org.koitharu.kotatsu.favourites.data.FavouriteCategoryEntity
 import org.koitharu.kotatsu.favourites.data.FavouriteEntity
 import org.koitharu.kotatsu.history.data.HistoryEntity
 import org.koitharu.kotatsu.parsers.model.SortOrder
-import org.koitharu.kotatsu.parsers.util.json.JSONIterator
-import org.koitharu.kotatsu.parsers.util.json.getBooleanOrDefault
-import org.koitharu.kotatsu.parsers.util.json.getStringOrNull
-import org.koitharu.kotatsu.parsers.util.json.mapJSON
+import org.koitharu.kotatsu.parsers.util.json.*
 
 class RestoreRepository(private val db: MangaDatabase) {
 
@@ -95,7 +92,8 @@ class RestoreRepository(private val db: MangaDatabase) {
 		updatedAt = json.getLong("updated_at"),
 		chapterId = json.getLong("chapter_id"),
 		page = json.getInt("page"),
-		scroll = json.getDouble("scroll").toFloat()
+		scroll = json.getDouble("scroll").toFloat(),
+		percent = json.getFloatOrDefault("percent", -1f),
 	)
 
 	private fun parseCategory(json: JSONObject) = FavouriteCategoryEntity(
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/db/MangaDatabase.kt b/app/src/main/java/org/koitharu/kotatsu/core/db/MangaDatabase.kt
index 2c74455f8..fbea719f5 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/db/MangaDatabase.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/db/MangaDatabase.kt
@@ -6,8 +6,14 @@ import androidx.room.Room
 import androidx.room.RoomDatabase
 import org.koitharu.kotatsu.bookmarks.data.BookmarkEntity
 import org.koitharu.kotatsu.bookmarks.data.BookmarksDao
-import org.koitharu.kotatsu.core.db.dao.*
-import org.koitharu.kotatsu.core.db.entity.*
+import org.koitharu.kotatsu.core.db.dao.MangaDao
+import org.koitharu.kotatsu.core.db.dao.PreferencesDao
+import org.koitharu.kotatsu.core.db.dao.TagsDao
+import org.koitharu.kotatsu.core.db.dao.TrackLogsDao
+import org.koitharu.kotatsu.core.db.entity.MangaEntity
+import org.koitharu.kotatsu.core.db.entity.MangaPrefsEntity
+import org.koitharu.kotatsu.core.db.entity.MangaTagsEntity
+import org.koitharu.kotatsu.core.db.entity.TagEntity
 import org.koitharu.kotatsu.core.db.migrations.*
 import org.koitharu.kotatsu.favourites.data.FavouriteCategoriesDao
 import org.koitharu.kotatsu.favourites.data.FavouriteCategoryEntity
@@ -27,7 +33,7 @@ import org.koitharu.kotatsu.tracker.data.TracksDao
 		FavouriteCategoryEntity::class, FavouriteEntity::class, MangaPrefsEntity::class,
 		TrackEntity::class, TrackLogEntity::class, SuggestionEntity::class, BookmarkEntity::class,
 	],
-	version = 11,
+	version = 12,
 )
 abstract class MangaDatabase : RoomDatabase() {
 
@@ -67,6 +73,7 @@ fun MangaDatabase(context: Context): MangaDatabase = Room.databaseBuilder(
 	Migration8To9(),
 	Migration9To10(),
 	Migration10To11(),
+	Migration11To12(),
 ).addCallback(
 	DatabasePrePopulateCallback(context.resources)
 ).build()
\ No newline at end of file
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/db/migrations/Migration11To12.kt b/app/src/main/java/org/koitharu/kotatsu/core/db/migrations/Migration11To12.kt
new file mode 100644
index 000000000..923c1b401
--- /dev/null
+++ b/app/src/main/java/org/koitharu/kotatsu/core/db/migrations/Migration11To12.kt
@@ -0,0 +1,12 @@
+package org.koitharu.kotatsu.core.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+class Migration11To12 : Migration(11, 12) {
+
+	override fun migrate(database: SupportSQLiteDatabase) {
+		database.execSQL("ALTER TABLE history ADD COLUMN `percent` REAL NOT NULL DEFAULT -1")
+		database.execSQL("ALTER TABLE bookmarks ADD COLUMN `percent` REAL NOT NULL DEFAULT -1")
+	}
+}
\ No newline at end of file
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/model/MangaHistory.kt b/app/src/main/java/org/koitharu/kotatsu/core/model/MangaHistory.kt
index 95f736f2b..9ac085183 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/model/MangaHistory.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/model/MangaHistory.kt
@@ -11,4 +11,5 @@ data class MangaHistory(
 	val chapterId: Long,
 	val page: Int,
 	val scroll: Int,
+	val percent: Float,
 ) : Parcelable
\ No newline at end of file
diff --git a/app/src/main/java/org/koitharu/kotatsu/history/data/EntityMapping.kt b/app/src/main/java/org/koitharu/kotatsu/history/data/EntityMapping.kt
index c03300b99..0e5624559 100644
--- a/app/src/main/java/org/koitharu/kotatsu/history/data/EntityMapping.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/history/data/EntityMapping.kt
@@ -1,12 +1,13 @@
 package org.koitharu.kotatsu.history.data
 
-import java.util.*
 import org.koitharu.kotatsu.core.model.MangaHistory
+import java.util.*
 
 fun HistoryEntity.toMangaHistory() = MangaHistory(
 	createdAt = Date(createdAt),
 	updatedAt = Date(updatedAt),
 	chapterId = chapterId,
 	page = page,
-	scroll = scroll.toInt()
+	scroll = scroll.toInt(),
+	percent = percent,
 )
\ No newline at end of file
diff --git a/app/src/main/java/org/koitharu/kotatsu/history/data/HistoryEntity.kt b/app/src/main/java/org/koitharu/kotatsu/history/data/HistoryEntity.kt
index 24a487c60..181499fa4 100644
--- a/app/src/main/java/org/koitharu/kotatsu/history/data/HistoryEntity.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/history/data/HistoryEntity.kt
@@ -13,16 +13,17 @@ import org.koitharu.kotatsu.core.db.entity.MangaEntity
 			entity = MangaEntity::class,
 			parentColumns = ["manga_id"],
 			childColumns = ["manga_id"],
-			onDelete = ForeignKey.CASCADE
+			onDelete = ForeignKey.CASCADE,
 		)
 	]
 )
 class HistoryEntity(
 	@PrimaryKey(autoGenerate = false)
 	@ColumnInfo(name = "manga_id") val mangaId: Long,
-	@ColumnInfo(name = "created_at") val createdAt: Long = System.currentTimeMillis(),
+	@ColumnInfo(name = "created_at") val createdAt: Long,
 	@ColumnInfo(name = "updated_at") val updatedAt: Long,
 	@ColumnInfo(name = "chapter_id") val chapterId: Long,
 	@ColumnInfo(name = "page") val page: Int,
 	@ColumnInfo(name = "scroll") val scroll: Float,
+	@ColumnInfo(name = "percent") val percent: Float,
 )
\ No newline at end of file
diff --git a/app/src/main/java/org/koitharu/kotatsu/history/domain/HistoryRepository.kt b/app/src/main/java/org/koitharu/kotatsu/history/domain/HistoryRepository.kt
index 4519b60e4..fa043ad14 100644
--- a/app/src/main/java/org/koitharu/kotatsu/history/domain/HistoryRepository.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/history/domain/HistoryRepository.kt
@@ -59,7 +59,7 @@ class HistoryRepository(
 			.distinctUntilChanged()
 	}
 
-	suspend fun addOrUpdate(manga: Manga, chapterId: Long, page: Int, scroll: Int) {
+	suspend fun addOrUpdate(manga: Manga, chapterId: Long, page: Int, scroll: Int, percent: Float) {
 		if (manga.isNsfw && settings.isHistoryExcludeNsfw) {
 			return
 		}
@@ -75,6 +75,7 @@ class HistoryRepository(
 					chapterId = chapterId,
 					page = page,
 					scroll = scroll.toFloat(), // we migrate to int, but decide to not update database
+					percent = percent,
 				)
 			)
 			trackingRepository.syncWithHistory(manga, chapterId)
diff --git a/app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt b/app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt
index 931461de0..39ec6946a 100644
--- a/app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt
@@ -6,7 +6,6 @@ import androidx.activity.result.ActivityResultLauncher
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.viewModelScope
-import java.util.*
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.*
 import org.koitharu.kotatsu.R
@@ -32,6 +31,7 @@ import org.koitharu.kotatsu.utils.SingleLiveEvent
 import org.koitharu.kotatsu.utils.ext.asLiveDataDistinct
 import org.koitharu.kotatsu.utils.ext.printStackTraceDebug
 import org.koitharu.kotatsu.utils.ext.processLifecycleScope
+import java.util.*
 
 private const val BOUNDS_PAGE_OFFSET = 2
 private const val PAGES_TRIM_THRESHOLD = 120
@@ -135,13 +135,16 @@ class ReaderViewModel(
 		}
 	}
 
+	// TODO check performance
 	fun saveCurrentState(state: ReaderState? = null) {
 		if (state != null) {
 			currentState.value = state
 		}
+		val readerState = state ?: currentState.value ?: return
 		historyRepository.saveStateAsync(
-			mangaData.value ?: return,
-			state ?: currentState.value ?: return
+			manga = mangaData.value ?: return,
+			state = readerState,
+			percent = computePercent(readerState.chapterId, readerState.page)
 		)
 	}
 
@@ -223,7 +226,7 @@ class ReaderViewModel(
 		if (bookmarkJob?.isActive == true) {
 			return
 		}
-		bookmarkJob = launchJob {
+		bookmarkJob = launchJob(Dispatchers.Default) {
 			loadingJob?.join()
 			val state = checkNotNull(currentState.value)
 			val page = checkNotNull(getCurrentPage()) { "Page not found" }
@@ -235,9 +238,10 @@ class ReaderViewModel(
 				scroll = state.scroll,
 				imageUrl = page.preview ?: pageLoader.getPageUrl(page),
 				createdAt = Date(),
+				percent = computePercent(state.chapterId, state.page),
 			)
 			bookmarksRepository.addBookmark(bookmark)
-			onShowToast.call(R.string.bookmark_added)
+			onShowToast.postCall(R.string.bookmark_added)
 		}
 	}
 
@@ -279,7 +283,8 @@ class ReaderViewModel(
 			val pages = loadChapter(requireNotNull(currentState.value).chapterId)
 			// save state
 			currentState.value?.let {
-				historyRepository.addOrUpdate(manga, it.chapterId, it.page, it.scroll)
+				val percent = computePercent(it.chapterId, it.page)
+				historyRepository.addOrUpdate(manga, it.chapterId, it.page, it.scroll, percent)
 				shortcutsRepository.updateShortcuts()
 			}
 
@@ -364,20 +369,32 @@ class ReaderViewModel(
 			it.printStackTraceDebug()
 		}.getOrDefault(defaultMode)
 	}
+
+	private fun computePercent(chapterId: Long, pageIndex: Int): Float {
+		val chapters = manga?.chapters ?: return -1f
+		val chaptersCount = chapters.size
+		val chapterIndex = chapters.indexOfFirst { x -> x.id == chapterId }
+		val pages = content.value?.pages ?: return -1f
+		val pagesCount = pages.count { x -> x.chapterId == chapterId }
+		val chapterPercent = (chapterIndex + 1) / chaptersCount.toFloat()
+		val pagePercent = (pageIndex + 1) / pagesCount.toFloat()
+		return pagePercent * chapterPercent // FIXME
+	}
 }
 
 /**
  * This function is not a member of the ReaderViewModel
  * because it should work independently of the ViewModel's lifecycle.
  */
-private fun HistoryRepository.saveStateAsync(manga: Manga, state: ReaderState): Job {
+private fun HistoryRepository.saveStateAsync(manga: Manga, state: ReaderState, percent: Float): Job {
 	return processLifecycleScope.launch(Dispatchers.Default) {
 		runCatching {
 			addOrUpdate(
 				manga = manga,
 				chapterId = state.chapterId,
 				page = state.page,
-				scroll = state.scroll
+				scroll = state.scroll,
+				percent = percent,
 			)
 		}.onFailure {
 			it.printStackTraceDebug()