Nerdy Tools

Specs are useful. Calculations are better. Nerdy Tools turns the numbers behind gaming PCs, monitors and graphics settings into something you can actually use. These calculators are free, run in your browser and are designed to show the trade-offs instead of declaring one setup “best” for everyone.

Choose a tool below. Each one includes an explanation of what the result means, what inputs matter most, and where a simple calculation stops being the whole story.

Display & image quality tools

Monitor Size & Resolution Calculator

Compare PPI, pixel pitch, pixels per degree, field of view, frame interval and total pixel load. It is most useful when you are deciding between sizes and resolutions such as 24-inch 1080p, 27-inch 1440p and 32-inch 4K.

Best inputs: your actual viewing distance, native resolution, screen size and refresh rate. PPI alone cannot tell you how sharp a monitor will look from where you sit.

DLSS Render Resolution Calculator

See the approximate internal resolution behind DLSS Quality, Balanced, Performance and Ultra Performance. This makes it much easier to understand why the same DLSS mode can look different at 1080p, 1440p and 4K.

Read the result as a reference: individual games can round dimensions differently, use dynamic resolution or expose custom scaling.

Refresh Rate & Frame Time Calculator

Convert Hz and FPS into milliseconds, compare two refresh targets and see whether your game frame rate is above or below your display’s refresh rate.

What it does not measure: total input latency. CPU/GPU render queues, synchronization, display processing and pixel response time still matter.

Power, cost & efficiency tools

GPU Efficiency Calculator

Estimate GPU electricity cost and calculate FPS per watt, purchase cost per FPS and ownership cost per FPS. It is built for comparing graphics cards under equivalent benchmark conditions rather than simply comparing their advertised wattage.

For fair comparisons: use the same games, resolution, settings and measurement method for every GPU.

PC Electricity Cost Calculator

Estimate daily, monthly and yearly electricity use from gaming and idle/light-use power, then compare an efficiency target to see what a frame cap, undervolt or lower idle draw could save.

For the best estimate: use whole-system power measured at the wall and your real electricity tariff.

PSU & Power Headroom Calculator

Cross-check component power, desired headroom and the GPU manufacturer’s recommended system PSU, then compare the result with your current power supply.

This is a sizing cross-check, not a safety certificate: connector requirements, transient loads, PSU age, quality and the hardware maker’s recommendations still take priority.

How to use Nerdy Tools well

  • Use measured data when you can. Real wall power or review measurements are usually more useful than a maximum specification.
  • Keep comparisons consistent. A calculation is only fair when the underlying test conditions match.
  • Treat outputs as decision aids. A monitor, GPU or PSU cannot be judged by one metric.
  • Follow the explanation below each tool. We show the assumptions and limitations because a neat number can still be misleading.

Start with the question you are trying to answer

  • Will this monitor look sharp from my desk? Use the Monitor Size & Resolution Calculator.
  • What resolution is DLSS actually rendering? Use the DLSS Render Resolution Calculator.
  • How much does 240Hz really improve frame time? Use the Refresh Rate & Frame Time Calculator.
  • Which GPU gives me more performance per watt? Use the GPU Efficiency Calculator.
  • What is my gaming PC likely to cost in electricity? Use the PC Electricity Cost Calculator.
  • Is my PSU capacity sensible for an upgrade? Use the PSU & Power Headroom Calculator.

New hardware deep dives

If you want the explanation behind the numbers, start with these newer guides:

We’ll keep adding tools when a calculation genuinely helps answer a hardware question better than another paragraph of advice.

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