1. What is the DC to AC Power Conversion?

This calculator helps determine the AC input power required for a PC power supply based on its DC output rating. The 1.25 factor accounts for efficiency losses in the power conversion process.

2. How Does the Calculator Work?

The calculator uses the power conversion formula:

Where:

• AC Input — Required alternating current power input (watts)
• DC Output — Direct current power output rating (watts)
• 1.25 — Conversion factor accounting for efficiency losses

Explanation: Power supplies are not 100% efficient, so the AC input must be higher than the DC output to account for these losses.

3. Importance of Power Supply Calculation

Details: Proper power supply sizing is crucial for system stability and preventing overload. Undersized power supplies can cause system crashes and hardware damage.

4. Using the Calculator

Tips: Enter the DC output rating of your power supply in watts. The calculator will show the minimum AC input required for stable operation.

5. Frequently Asked Questions (FAQ)

Q1: Why use 1.25 as the conversion factor?
A: The 1.25 factor accounts for typical power supply efficiency of about 80%. Some high-efficiency units may use slightly lower factors.

Q2: What if my power supply has multiple voltage rails?
A: Use the total combined maximum DC output wattage rating of the power supply.

Q3: Should I add extra capacity?
A: Yes, it's recommended to have 20-30% additional capacity beyond your calculated needs for headroom and future upgrades.

Q4: How does this affect my electricity bill?
A: Your electricity usage is based on the actual AC input power drawn, not the DC output rating.

Q5: Are there more precise ways to calculate this?
A: For exact calculations, check your power supply's efficiency rating (80 Plus certification level) and use its specific efficiency curve.