1. What is a PC Power Supply Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{supply} \) — Recommended power supply wattage
• \( P_{component} \) — Power draw of each component
• 1.2 — 20% safety margin for efficiency and headroom

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

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 typical RAM (15W), storage (20W), and other components (50W).

5. Frequently Asked Questions (FAQ)

Q1: Why the 20% safety margin?
A: The margin accounts for power spikes, aging components, and ensures the PSU operates in its most efficient range.

Q2: Where do I find component wattage?
A: Check manufacturer specifications for CPU and GPU. RAM and storage typically use 15-20W each.

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

Q4: Does this include overclocking?
A: No, add 10-20% more wattage if you plan to overclock your CPU or GPU.

Q5: What about power supply efficiency ratings?
A: This calculation is for total wattage needed. Look for 80+ Bronze/Silver/Gold/Platinum rated PSUs for better efficiency.