diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index 597db68222..adf781c97d 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -205,7 +205,7 @@ OptionsDialog::OptionsDialog(QWidget* parent, bool enableWallet)
     CreateOptionUI(verticalLayout_Mempool, maxorphantx, tr("Keep at most %s unconnected transactions in memory"));
 
     maxmempool = new QSpinBox(tabMempool);
-    const int64_t nMempoolSizeMinMB = maxmempoolMinimumBytes(gArgs.GetIntArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT_KVB) * 1'000);
+    const int64_t nMempoolSizeMinMB = maxmempoolMinimumBytes(gArgs.GetIntArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT_KVB) * 1'000) / 1'000'000;
     maxmempool->setMinimum(nMempoolSizeMinMB);
     maxmempool->setMaximum(std::numeric_limits<int>::max());
     CreateOptionUI(verticalLayout_Mempool, maxmempool, tr("Keep the transaction memory pool below %s MB"));
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index e93b2b4634..1270f936d1 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -613,7 +613,7 @@ QVariant OptionsModel::getOption(OptionID option, const std::string& suffix) con
     case maxorphantx:
         return qlonglong(gArgs.GetIntArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS));
     case maxmempool:
-        return qlonglong(node().mempool().m_max_size_bytes);
+        return qlonglong(node().mempool().m_max_size_bytes / 1'000'000);
     default:
         return QVariant();
     }