diff --git a/src/tools/energy-computer/energy-computer.service.test.ts b/src/tools/energy-computer/energy-computer.service.test.ts
new file mode 100644
index 00000000..a010df05
--- /dev/null
+++ b/src/tools/energy-computer/energy-computer.service.test.ts
@@ -0,0 +1,53 @@
+import { describe, expect, it } from 'vitest';
+
+import { computeCost } from './energy-computer.service'; // Adjust the import path as needed
+
+describe('computeCost', () => {
+  it('should calculate the correct cost for valid inputs', () => {
+    const wattage = 1000; // 1000 watts = 1 kW
+    const duration = 5; // 5 hours
+    const kWhCost = 0.12; // $0.12 per kWh
+    const result = computeCost(wattage, duration, kWhCost);
+    expect(result).toBeCloseTo(0.60); // 1 kW * 5h * 0.12 = 0.60
+  });
+
+  it('should return 0 when the duration is 0', () => {
+    const wattage = 1000;
+    const duration = 0;
+    const kWhCost = 0.12;
+    const result = computeCost(wattage, duration, kWhCost);
+    expect(result).toBe(0);
+  });
+
+  it('should return 0 when the wattage is 0', () => {
+    const wattage = 0;
+    const duration = 5;
+    const kWhCost = 0.12;
+    const result = computeCost(wattage, duration, kWhCost);
+    expect(result).toBe(0);
+  });
+
+  it('should return 0 when the cost per kWh is 0', () => {
+    const wattage = 1000;
+    const duration = 5;
+    const kWhCost = 0;
+    const result = computeCost(wattage, duration, kWhCost);
+    expect(result).toBe(0);
+  });
+
+  it('should handle fractional wattage and duration correctly', () => {
+    const wattage = 750; // 0.75 kW
+    const duration = 2.5; // 2.5 hours
+    const kWhCost = 0.10; // $0.10 per kWh
+    const result = computeCost(wattage, duration, kWhCost);
+    expect(result).toBeCloseTo(0.1875); // 0.75 kW * 2.5h * 0.10 = 0.1875
+  });
+
+  it('should handle large numbers correctly', () => {
+    const wattage = 1000000; // 1 MW
+    const duration = 24; // 24 hours
+    const kWhCost = 0.15; // $0.15 per kWh
+    const result = computeCost(wattage, duration, kWhCost);
+    expect(result).toBe(3600); // 1000 kW * 24h * 0.15 = 3600
+  });
+});
diff --git a/src/tools/energy-computer/energy-computer.service.ts b/src/tools/energy-computer/energy-computer.service.ts
new file mode 100644
index 00000000..8702f5ab
--- /dev/null
+++ b/src/tools/energy-computer/energy-computer.service.ts
@@ -0,0 +1,6 @@
+export function computeCost(wattage: number, durationHours: number, costPerKWh: number): number {
+  const kilowatts = wattage / 1000;
+  const energyConsumed = kilowatts * durationHours;
+  const totalCost = energyConsumed * costPerKWh;
+  return totalCost;
+}
diff --git a/src/tools/energy-computer/energy-computer.vue b/src/tools/energy-computer/energy-computer.vue
new file mode 100644
index 00000000..74789183
--- /dev/null
+++ b/src/tools/energy-computer/energy-computer.vue
@@ -0,0 +1,26 @@
+<script setup lang="ts">
+import { computeCost } from './energy-computer.service';
+
+const wattage = ref(100);
+const durationHours = ref(2);
+const kWhCost = ref(0.1);
+const totalCost = computed(() => computeCost(wattage.value, durationHours.value, kWhCost.value));
+</script>
+
+<template>
+  <div>
+    <n-form-item label="Device Wattage" mb-1>
+      <n-input-number v-model:value="wattage" :min="0" />
+    </n-form-item>
+    <n-form-item label="Usage Duration (hours)" mb-1>
+      <n-input-number v-model:value="durationHours" :min="0" />
+    </n-form-item>
+    <n-form-item label="kWh Cost" mb-1>
+      <n-input-number v-model:value="kWhCost" :min="0" />
+    </n-form-item>
+
+    <n-divider />
+
+    <input-copyable label="Total Cost" :value="totalCost" />
+  </div>
+</template>
diff --git a/src/tools/energy-computer/index.ts b/src/tools/energy-computer/index.ts
new file mode 100644
index 00000000..25d0cc1b
--- /dev/null
+++ b/src/tools/energy-computer/index.ts
@@ -0,0 +1,12 @@
+import { Engine } from '@vicons/tabler';
+import { defineTool } from '../tool';
+
+export const tool = defineTool({
+  name: 'Energy Consumption and Expense Computer',
+  path: '/energy-computer',
+  description: 'Compute energy consumption and expense',
+  keywords: ['energy', 'expense', 'watt', 'kwh', 'computer'],
+  component: () => import('./energy-computer.vue'),
+  icon: Engine,
+  createdAt: new Date('2024-08-15'),
+});
diff --git a/src/tools/index.ts b/src/tools/index.ts
index 388cfaf4..345c29ae 100644
--- a/src/tools/index.ts
+++ b/src/tools/index.ts
@@ -2,6 +2,7 @@ import { tool as base64FileConverter } from './base64-file-converter';
 import { tool as base64StringConverter } from './base64-string-converter';
 import { tool as basicAuthGenerator } from './basic-auth-generator';
 import { tool as emailNormalizer } from './email-normalizer';
+import { tool as energyComputer } from './energy-computer';
 
 import { tool as asciiTextDrawer } from './ascii-text-drawer';
 
@@ -172,7 +173,12 @@ export const toolsByCategory: ToolCategory[] = [
   },
   {
     name: 'Measurement',
-    components: [chronometer, temperatureConverter, benchmarkBuilder],
+    components: [
+      chronometer,
+      temperatureConverter,
+      benchmarkBuilder,
+      energyComputer,
+    ],
   },
   {
     name: 'Text',