diff --git a/rpcs3/Crypto/unpkg.h b/rpcs3/Crypto/unpkg.h
index d253561509..0b7971c07e 100644
--- a/rpcs3/Crypto/unpkg.h
+++ b/rpcs3/Crypto/unpkg.h
@@ -347,6 +347,7 @@ public:
 	};
 
 	bool is_valid() const { return m_is_valid; }
+	const PKGHeader& get_header() const { return m_header; }
 	package_install_result check_target_app_version() const;
 	static package_install_result extract_data(std::deque<package_reader>& readers, std::deque<std::string>& bootable_paths);
 	const psf::registry& get_psf() const { return m_psf; }
diff --git a/rpcs3/Emu/system_utils.cpp b/rpcs3/Emu/system_utils.cpp
index e840887bac..3cf886d06d 100644
--- a/rpcs3/Emu/system_utils.cpp
+++ b/rpcs3/Emu/system_utils.cpp
@@ -184,6 +184,11 @@ namespace rpcs3::utils
 		return g_cfg_vfs.get(g_cfg_vfs.dev_bdvd, get_emu_dir());
 	}
 
+	std::string get_hdd0_game_dir()
+	{
+		return get_hdd0_dir() + "game/";
+	}
+
 	u64 get_cache_disk_usage()
 	{
 		if (const u64 data_size = fs::get_dir_size(rpcs3::utils::get_cache_dir(), 1); data_size != umax)
diff --git a/rpcs3/Emu/system_utils.hpp b/rpcs3/Emu/system_utils.hpp
index b4142dacb9..c2825abb24 100644
--- a/rpcs3/Emu/system_utils.hpp
+++ b/rpcs3/Emu/system_utils.hpp
@@ -34,6 +34,8 @@ namespace rpcs3::utils
 	std::string get_flash3_dir();
 	std::string get_bdvd_dir();
 
+	std::string get_hdd0_game_dir();
+
 	// Cache directories and disk usage
 	u64 get_cache_disk_usage();
 	std::string get_cache_dir();
diff --git a/rpcs3/rpcs3qt/game_compatibility.cpp b/rpcs3/rpcs3qt/game_compatibility.cpp
index 2d901b6642..2845659716 100644
--- a/rpcs3/rpcs3qt/game_compatibility.cpp
+++ b/rpcs3/rpcs3qt/game_compatibility.cpp
@@ -272,6 +272,10 @@ compat::package_info game_compatibility::GetPkgInfo(const QString& pkg_path, gam
 	info.category = QString::fromStdString(std::string(psf::get_string(psf, "CATEGORY")));
 	info.version  = QString::fromStdString(std::string(psf::get_string(psf, "APP_VER")));
 
+	// Technically, there is no specific package's header info providing its installation size on disk.
+	// We use "data_size" header as an approximation (a bit larger) for this purpose
+	info.data_size = reader.get_header().data_size.value();
+
 	if (!info.category.isEmpty())
 	{
 		const Localized localized;
diff --git a/rpcs3/rpcs3qt/game_compatibility.h b/rpcs3/rpcs3qt/game_compatibility.h
index f24ebfbe1f..664bafea34 100644
--- a/rpcs3/rpcs3qt/game_compatibility.h
+++ b/rpcs3/rpcs3qt/game_compatibility.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "util/types.hpp"
+
 #include <memory>
 
 #include <QJsonObject>
@@ -108,6 +110,7 @@ namespace compat
 		QString version;     // May be empty
 		QString category;    // HG, DG, GD etc.
 		QString local_cat;   // Localized category
+		u64 data_size = 0;   // Installation size
 
 		package_type type = package_type::other; // The type of package (Update, DLC or other)
 	};
diff --git a/rpcs3/rpcs3qt/main_window.cpp b/rpcs3/rpcs3qt/main_window.cpp
index 5509a6f69c..80d71a44c2 100644
--- a/rpcs3/rpcs3qt/main_window.cpp
+++ b/rpcs3/rpcs3qt/main_window.cpp
@@ -860,11 +860,28 @@ bool main_window::InstallPackages(QStringList file_paths, bool from_boot)
 				info.changelog = tr("Changelog:\n%0", "Block for Changelog").arg(info.changelog);
 			}
 
-			const QString info_string = QStringLiteral("%0\n\n%1%2%3%4").arg(file_info.fileName()).arg(info.title).arg(info.local_cat).arg(info.title_id).arg(info.version);
-			QString message = tr("Do you want to install this package?\n\n%0").arg(info_string);
+			u64 free_space = 0;
 
-			QMessageBox mb(QMessageBox::Icon::Question, tr("PKG Decrypter / Installer"), message, QMessageBox::Yes | QMessageBox::No, this);
+			// Retrieve disk space info on data path's drive
+			if (fs::device_stat stat{}; fs::statfs(rpcs3::utils::get_hdd0_dir(), stat))
+			{
+				free_space = stat.avail_free;
+			}
+
+			const QString installation_info =
+				tr("Installation path: %0\nAvailable disk space: %1%2\nRequired disk space: %3")
+				.arg(rpcs3::utils::get_hdd0_game_dir())
+				.arg(gui::utils::format_byte_size(free_space))
+				.arg(info.data_size <= free_space ? QString() : tr(" - <b>NOT ENOUGH SPACE</b>"))
+				.arg(gui::utils::format_byte_size(info.data_size));
+
+			const QString info_string = QStringLiteral("%0\n\n%1%2%3%4").arg(file_info.fileName()).arg(info.title).arg(info.local_cat).arg(info.title_id).arg(info.version);
+			QString message = tr("Do you want to install this package?\n\n%0\n\n%1").arg(info_string).arg(installation_info);
+
+			QMessageBox mb(QMessageBox::Icon::Question, tr("PKG Decrypter / Installer"), gui::utils::make_paragraph(message), QMessageBox::Yes | QMessageBox::No, this);
 			mb.setDefaultButton(QMessageBox::No);
+			mb.setTextFormat(Qt::RichText); // Support HTML tags
+			mb.button(QMessageBox::Yes)->setEnabled(info.data_size <= free_space);
 
 			if (!info.changelog.isEmpty())
 			{
diff --git a/rpcs3/rpcs3qt/pkg_install_dialog.cpp b/rpcs3/rpcs3qt/pkg_install_dialog.cpp
index 11431b2ad4..26fb7515c4 100644
--- a/rpcs3/rpcs3qt/pkg_install_dialog.cpp
+++ b/rpcs3/rpcs3qt/pkg_install_dialog.cpp
@@ -2,6 +2,10 @@
 #include "game_compatibility.h"
 #include "numbered_widget_item.h"
 #include "richtext_item_delegate.h"
+#include "qt_utils.h"
+
+#include "Emu/system_utils.hpp"
+#include "Utilities/File.h"
 
 #include <QDialogButtonBox>
 #include <QPushButton>
@@ -17,6 +21,7 @@ enum Roles
 	TitleRole       = Qt::UserRole + 2,
 	TitleIdRole     = Qt::UserRole + 3,
 	VersionRole     = Qt::UserRole + 4,
+	DataSizeRole    = Qt::UserRole + 5,
 };
 
 pkg_install_dialog::pkg_install_dialog(const QStringList& paths, game_compatibility* compat, QWidget* parent)
@@ -89,7 +94,8 @@ pkg_install_dialog::pkg_install_dialog(const QStringList& paths, game_compatibil
 		append_comma();
 		accumulated_info += file_info.fileName();
 
-		const QString text = tr("<b>%0</b> (%2)", "Package text").arg(info.title.simplified()).arg(accumulated_info);
+		const QString text = tr("<b>%0</b> (%1) - %2", "Package text").arg(info.title.simplified())
+			.arg(accumulated_info).arg(gui::utils::format_byte_size(info.data_size));
 
 		QListWidgetItem* item = new numbered_widget_item(text, m_dir_list);
 		item->setData(Roles::FullPathRole, info.path);
@@ -97,6 +103,7 @@ pkg_install_dialog::pkg_install_dialog(const QStringList& paths, game_compatibil
 		item->setData(Roles::TitleRole, info.title);
 		item->setData(Roles::TitleIdRole, info.title_id);
 		item->setData(Roles::VersionRole, info.version);
+		item->setData(Roles::DataSizeRole, static_cast<qulonglong>(info.data_size));
 		item->setToolTip(tooltip);
 		item->setFlags(item->flags() | Qt::ItemIsUserCheckable);
 		item->setCheckState(Qt::Checked);
@@ -106,6 +113,10 @@ pkg_install_dialog::pkg_install_dialog(const QStringList& paths, game_compatibil
 	m_dir_list->setCurrentRow(0);
 	m_dir_list->setMinimumWidth((m_dir_list->sizeHintForColumn(0) * 125) / 100);
 
+	// Create contextual label (updated in connect(m_dir_list, &QListWidget::itemChanged ...))
+	QLabel* installation_info = new QLabel();
+	installation_info->setTextFormat(Qt::RichText); // Support HTML tags
+
 	// Create buttons
 	QDialogButtonBox* buttons = new QDialogButtonBox(QDialogButtonBox::Cancel | QDialogButtonBox::Ok);
 	buttons->button(QDialogButtonBox::Ok)->setText(tr("Install"));
@@ -123,19 +134,9 @@ pkg_install_dialog::pkg_install_dialog(const QStringList& paths, game_compatibil
 		}
 	});
 
-	connect(m_dir_list, &QListWidget::itemChanged, this, [this, buttons](QListWidgetItem*)
+	connect(m_dir_list, &QListWidget::itemChanged, this, [this, installation_info, buttons](QListWidgetItem*)
 	{
-		bool any_checked = false;
-		for (int i = 0; i < m_dir_list->count(); i++)
-		{
-			if (m_dir_list->item(i)->checkState() == Qt::Checked)
-			{
-				any_checked = true;
-				break;
-			}
-		}
-
-		buttons->button(QDialogButtonBox::Ok)->setEnabled(any_checked);
+		UpdateInfo(installation_info, buttons);
 	});
 
 	QToolButton* move_up = new QToolButton;
@@ -159,11 +160,41 @@ pkg_install_dialog::pkg_install_dialog(const QStringList& paths, game_compatibil
 	vbox->addWidget(description);
 	vbox->addLayout(hbox);
 	vbox->addWidget(m_dir_list);
+	vbox->addWidget(installation_info);
 	vbox->addWidget(buttons);
 
 	setLayout(vbox);
 	setWindowTitle(tr("Batch PKG Installation"));
 	setObjectName("pkg_install_dialog");
+	UpdateInfo(installation_info, buttons); // Just to show and check available and required size
+}
+
+void pkg_install_dialog::UpdateInfo(QLabel* installation_info, QDialogButtonBox* buttons) const
+{
+	u64 data_size = 0;
+	u64 free_space = 0;
+
+	// Retrieve disk space info on data path's drive
+	if (fs::device_stat stat{}; fs::statfs(rpcs3::utils::get_hdd0_game_dir(), stat))
+	{
+		free_space = stat.avail_free;
+	}
+
+	for (int i = 0; i < m_dir_list->count(); i++)
+	{
+		if (m_dir_list->item(i)->checkState() == Qt::Checked)
+		{
+			data_size += m_dir_list->item(i)->data(Roles::DataSizeRole).toULongLong();
+		}
+	}
+
+	installation_info->setText(gui::utils::make_paragraph(
+		tr("Installation path: %0\nAvailable disk space: %1%2\nRequired disk space: %3")
+		.arg(rpcs3::utils::get_hdd0_game_dir())
+		.arg(gui::utils::format_byte_size(free_space))
+		.arg(data_size <= free_space ? QString() : tr(" - <b>NOT ENOUGH SPACE</b>"))
+		.arg(gui::utils::format_byte_size(data_size))));
+	buttons->button(QDialogButtonBox::Ok)->setEnabled(data_size && (data_size <= free_space));
 }
 
 void pkg_install_dialog::MoveItem(int offset) const
diff --git a/rpcs3/rpcs3qt/pkg_install_dialog.h b/rpcs3/rpcs3qt/pkg_install_dialog.h
index bb566b1b67..2122259a1d 100644
--- a/rpcs3/rpcs3qt/pkg_install_dialog.h
+++ b/rpcs3/rpcs3qt/pkg_install_dialog.h
@@ -2,6 +2,8 @@
 
 #include <QDialog>
 #include <QListWidget>
+#include <QLabel>
+#include <QDialogButtonBox>
 
 namespace compat
 {
@@ -19,6 +21,7 @@ public:
 	std::vector<compat::package_info> GetPathsToInstall() const;
 
 private:
+	void UpdateInfo(QLabel* installation_info, QDialogButtonBox* buttons) const;
 	void MoveItem(int offset) const;
 
 	QListWidget* m_dir_list;