diff --git a/src/modules/memory.cpp b/src/modules/memory.cpp
index b29e3c58..17df1507 100644
--- a/src/modules/memory.cpp
+++ b/src/modules/memory.cpp
@@ -16,11 +16,11 @@ auto waybar::modules::Memory::update() -> void
 {
   struct sysinfo info;
   if (!sysinfo(&info)) {
-    int available = 100 - ((double)info.freeram / (double)info.totalram) * 100;
+    int used_ram_percentage = 100 * (info.totalram - info.freeram) / info.totalram;
     auto format = _config["format"] ? _config["format"].asString() : "{}%";
-    _label.set_text(fmt::format(format, available));
-    auto used = (info.totalram - info.freeram) / std::pow(1024, 3);
-    _label.set_tooltip_text(fmt::format("{:.{}f}Gb used", used, 1));
+    _label.set_text(fmt::format(format, used_ram_percentage));
+    auto used_ram_gigabytes = (info.totalram - info.freeram) / std::pow(1024, 3);
+    _label.set_tooltip_text(fmt::format("{:.{}f}Gb used", used_ram_gigabytes, 1));
   }
 }