Newegg Psu Calculator

Reviewed by: David Chen, Electrical Engineer & PC Hardware Specialist

Estimating your PC’s power requirements is crucial for system stability. Use our Newegg PSU Calculator to determine the ideal wattage for your custom build, ensuring you have enough headroom for peak performance and future upgrades.

Newegg PSU Calculator

Newegg PSU Calculator Formula

Total Wattage (W) = [ (CPU_TDP + GPU_TDP + MB + RAM + Storage + Fans) × 1.2 ]

Source: Intel Power Supply Guide | NVIDIA GPU Specs

Variables:

• CPU TDP: The Thermal Design Power of your processor.
• GPU TDP: The maximum power consumption of your Graphics Card.
• Motherboard (MB): Estimated at a constant 50W for standard boards.
• RAM/Storage/Fans: Minor components that contribute to the total draw.
• Safety Margin (1.2): A 20% buffer to handle transient spikes and efficiency curves.

What is Newegg PSU Calculator?

A Newegg PSU Calculator is a specialized tool used by PC builders to estimate the total electrical power (in Watts) required by all hardware components within a computer. Choosing the right Power Supply Unit (PSU) is critical because an underpowered unit can cause system crashes, data loss, or even hardware damage during intensive tasks like gaming or video rendering.

By aggregating the TDP of major components and applying a safety factor, this calculator ensures that your PSU operates within its “sweet spot” of efficiency (usually between 40% and 80% load), extending the lifespan of your components.

How to Calculate Newegg PSU Calculator (Example)

1. Identify your CPU TDP (e.g., Intel i7-13700K = 125W).
2. Identify your GPU TDP (e.g., RTX 3080 = 320W).
3. Add fixed components: Motherboard (50W), 2 RAM sticks (10W), 2 SSDs (10W), 3 Fans (15W).
4. Sum the values: 125 + 320 + 50 + 10 + 10 + 15 = 530W.
5. Multiply by 1.2 for safety: 530 × 1.2 = 636W. Recommendation: 650W or 750W PSU.

Related Calculators

• PC Build Budget Estimator
• CPU Bottleneck Calculator
• Electricity Cost Calculator
• UPS Backup Time Calculator

Frequently Asked Questions (FAQ)

Is 750W enough for an RTX 4080? Generally, yes, but it depends on your CPU. High-end CPUs like the i9 might require an 850W+ unit for safety.

What is 80 Plus Gold? It is an efficiency rating. A higher rating means less power is wasted as heat, lowering your electricity bill.

Why add a 20% margin? This accounts for “Transient Spikes” where GPUs briefly draw much more power than their rated TDP.

Does the calculator include RGB lighting? RGB draws very little power, but our 20% margin easily covers peripherals and lighting.