1. What is a PSU Power Supply Calculator?

Definition: This calculator estimates the required power supply unit (PSU) wattage based on the power consumption of all computer 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 PSU wattage (watts)
• \( P_{component} \) — Power consumption of each component (watts)
• 1.2 — 20% overhead factor for efficiency and future upgrades

Explanation: The calculator sums all component power requirements and adds a 20% buffer to ensure stable operation and headroom for 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 the wattage for each component. Default values are provided for RAM (15W), storage (10W), and other components (30W). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is there a 20% overhead?
A: The overhead accounts for power spikes, efficiency losses, and provides headroom for future upgrades.

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

Q3: Should I round up the PSU wattage?
A: Yes, it's recommended to round up to the nearest standard PSU wattage (e.g., 550W, 650W).

Q4: Does this account for overclocking?
A: No, if you plan to overclock, consider adding 10-20% more wattage to your calculation.

Q5: What about power supply efficiency ratings?
A: This calculator gives the required wattage at the components. The PSU's efficiency rating (80 Plus) affects power draw from the wall, not the output to components.