1. What is a PC Power Supply Calculator?

Definition: This calculator estimates the wattage needed for a PC power supply based on the power requirements of individual components.

Purpose: It helps PC builders select an appropriately sized power supply for their system configuration.

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 for efficiency and headroom

Explanation: The calculator sums all component power requirements and adds a 20% buffer to ensure stable operation and account for power spikes.

3. Importance of Proper Power Supply Sizing

Details: An adequately sized power supply ensures system stability, prevents crashes, and allows for future upgrades while operating efficiently.

4. Using the Calculator

Tips: Enter the wattage for each component. Default values are provided for typical 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, and provides headroom for future upgrades.

Q2: Where can I find component wattage?
A: Check manufacturer specifications or use online databases like PCPartPicker for common components.

Q3: Should I round up to available PSU sizes?
A: Yes, choose the next available standard wattage (e.g., 550W, 650W, 750W) above your calculated value.

Q4: Does this account for overclocking?
A: No, add 10-20% more wattage if you plan significant overclocking of CPU or GPU.

Q5: What about power supply efficiency ratings?
A: This calculator gives total wattage needed. For actual power draw from the wall, consider 80 Plus ratings (Gold, Platinum, etc.).