node, qt: use `1_MiB` for dbcache conversions

diff --git a/src/init.cpp b/src/init.cpp
index f22302ff..44f06079 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -530,7 +530,7 @@ void SetupServerArgs(ArgsManager& argsman, bool can_listen_ipc)
     argsman.AddArg("-conf=<file>", strprintf("Specify path to read-only configuration file. Relative paths will be prefixed by datadir location (only useable from command line, not configuration file) (default: %s)", BITCOIN_CONF_FILENAME), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
     argsman.AddArg("-datadir=<dir>", "Specify data directory", ArgsManager::ALLOW_ANY | ArgsManager::DISALLOW_NEGATION, OptionsCategory::OPTIONS);
     argsman.AddArg("-dbbatchsize", strprintf("Maximum database write batch size in bytes (default: %u)", DEFAULT_DB_CACHE_BATCH), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::OPTIONS);
-    argsman.AddArg("-dbcache=<n>", strprintf("Maximum database cache size <n> MiB (minimum %d, default: %d). Make sure you have enough RAM. In addition, unused memory allocated to the mempool is shared with this cache (see -maxmempool).", MIN_DB_CACHE >> 20, node::GetDefaultDBCache() >> 20), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
+    argsman.AddArg("-dbcache=<n>", strprintf("Maximum database cache size <n> MiB (minimum %d, default: %d). Make sure you have enough RAM. In addition, unused memory allocated to the mempool is shared with this cache (see -maxmempool).", MIN_DB_CACHE / 1_MiB, node::GetDefaultDBCache() / 1_MiB), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
     argsman.AddArg("-includeconf=<file>", "Specify additional configuration file, relative to the -datadir path (only useable from configuration file, not command line)", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
     argsman.AddArg("-allowignoredconf", strprintf("For backwards compatibility, treat an unused %s file in the datadir as a warning, not an error.", BITCOIN_CONF_FILENAME), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
     argsman.AddArg("-loadblock=<file>", "Imports blocks from an external file on startup. Obfuscated blocks are not supported.", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
diff --git a/src/node/caches.cpp b/src/node/caches.cpp
index 7b0223e3..fc13b8a2 100644
--- a/src/node/caches.cpp
+++ b/src/node/caches.cpp
@@ -92,7 +92,7 @@ void LogOversizedDbCache(const ArgsManager& args) noexcept
         const uint64_t db_cache{CalculateDbCacheBytes(args)};
         if (ShouldWarnOversizedDbCache(db_cache, *total_ram)) {
             InitWarning(bilingual_str{tfm::format(_("A %zu MiB dbcache may be too large for a system memory of only %zu MiB."),
-                        db_cache >> 20, *total_ram >> 20)});
+                        db_cache / 1_MiB, *total_ram / 1_MiB)});
         }
     }
 }
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index f68e5825..a68829c2 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -95,7 +95,7 @@ OptionsDialog::OptionsDialog(QWidget* parent, bool enableWallet)
     ui->verticalLayout->setStretchFactor(ui->tabWidget, 1);
 
     /* Main elements init */
-    ui->databaseCache->setRange(MIN_DB_CACHE >> 20, std::numeric_limits<int>::max());
+    ui->databaseCache->setRange(MIN_DB_CACHE / 1_MiB, std::numeric_limits<int>::max());
     ui->threadsScriptVerif->setMinimum(-GetNumCores());
     ui->threadsScriptVerif->setMaximum(MAX_SCRIPTCHECK_THREADS);
     ui->pruneWarning->setVisible(false);
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index d52c65d6..49e3c4b8 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -469,7 +469,7 @@ QVariant OptionsModel::getOption(OptionID option, const std::string& suffix) con
                suffix.empty()          ? getOption(option, "-prev") :
                                          DEFAULT_PRUNE_TARGET_GB;
     case DatabaseCache:
-        return qlonglong(SettingTo<int64_t>(setting(), node::GetDefaultDBCache() >> 20));
+        return qlonglong(SettingTo<int64_t>(setting(), node::GetDefaultDBCache() / 1_MiB));
     case ThreadsScriptVerif:
         return qlonglong(SettingTo<int64_t>(setting(), DEFAULT_SCRIPTCHECK_THREADS));
     case Listen:
@@ -732,7 +732,7 @@ void OptionsModel::checkAndMigrate()
         // see https://github.com/bitcoin/bitcoin/pull/8273
         // force people to upgrade to the new value if they are using 100MB
         if (settingsVersion < 130000 && settings.contains("nDatabaseCache") && settings.value("nDatabaseCache").toLongLong() == 100)
-            settings.setValue("nDatabaseCache", (qint64)(DEFAULT_DB_CACHE >> 20));
+            settings.setValue("nDatabaseCache", qint64(DEFAULT_DB_CACHE / 1_MiB));
 
         settings.setValue(strSettingsVersionKey, CLIENT_VERSION);
     }