1. What is a Computer Power Supply Calculator?

Definition: This calculator estimates the minimum power supply wattage needed for a computer build with a 20% safety margin.

Purpose: It helps PC builders select an appropriately sized power supply unit (PSU) for their components.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{supply} \) — Recommended power supply wattage
• \( P_{component} \) — Wattage of each component
• 1.2 — 20% safety margin factor

Explanation: The calculator sums all component power requirements and adds a 20% buffer for efficiency, peak loads, and future upgrades.

3. Importance of Proper PSU Sizing

Details: An adequately sized PSU ensures system stability, prevents crashes, improves efficiency, and allows for future upgrades.

4. Using the Calculator

Tips: Enter wattage for each component. Default values are provided for RAM (15W), storage (10W), and other components (30W).

5. Frequently Asked Questions (FAQ)

Q1: Why the 20% safety margin?
A: The margin accounts for power spikes, efficiency losses, capacitor aging, and future upgrades.

Q2: Where do I find component wattage?
A: Check manufacturer specifications or use online databases like PCPartPicker.

Q3: Should I round up the PSU wattage?
A: Yes, always round up to the nearest available PSU wattage (e.g., 543W → 550W or 600W).

Q4: Does this include overclocking?
A: No, add 15-30% more wattage if you plan significant overclocking.

Q5: What about PSU efficiency ratings?
A: This calculator gives total wattage needed. Choose an 80+ Gold or better PSU for efficiency.