diff --git a/src/lib/server/calc.ts b/src/lib/server/calc.ts
new file mode 100644
index 0000000..27a1150
--- /dev/null
+++ b/src/lib/server/calc.ts
@@ -0,0 +1,17 @@
+import { ContainerStats } from "dockerode";
+
+export function CPUusage(stats: ContainerStats) {
+  const cpuDelta =
+    stats.cpu_stats.cpu_usage.total_usage -
+    stats.precpu_stats.cpu_usage.total_usage;
+  const systemDelta =
+    stats.cpu_stats.system_cpu_usage - stats.precpu_stats.system_cpu_usage;
+  const onlineCPUs =
+    stats.cpu_stats.online_cpus ||
+    stats.cpu_stats.cpu_usage.percpu_usage.length;
+
+  if (systemDelta > 0 && cpuDelta > 0) {
+    return (cpuDelta / systemDelta) * onlineCPUs * 100.0;
+  }
+  return 0.0;
+}