1. What is a PC Power Supply Calculator?

Definition: This calculator estimates the wattage needed for a PC power supply unit (PSU) based on component power requirements with a 20% safety margin.

Purpose: It helps PC builders select an appropriately sized power supply to ensure system stability and allow for future upgrades.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Proper PSU Sizing

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

4. Using the Calculator

Tips: Enter each component's maximum power consumption (TDP for CPU/GPU). Default values are provided for typical RAM, storage, and other components.

5. Frequently Asked Questions (FAQ)

Q1: Why the 20% safety margin?
A: It accounts for power spikes, PSU aging, efficiency losses, and provides headroom for future upgrades.

Q2: Where do I find component wattage?
A: Check manufacturer specifications (TDP for CPUs/GPUs). Most modern CPUs range 65-125W, GPUs 150-350W.

Q3: Should I round up the result?
A: Yes, choose the next available standard PSU wattage (e.g., 550W → get a 600W or 650W PSU).

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

Q5: Are there other factors to consider?
A: Yes, also consider PSU efficiency rating (80+ Bronze/Silver/Gold) and quality of components.