Free PC Tools and Calculators
Built by IT pros for PC builders and gamers. Get instant, accurate results with our FPS calculator, PC airflow calculator, PSU wattage calculator, CPU bottleneck checker, RAM optimizer.
Most Used Calculators
Quick access to our most popular PC hardware tools and calculators.
PSU Wattage Calculator
Calculate the right power supply wattage for your PC build based on your components.
CPU Bottleneck Calculator
Find out if your CPU is limiting your GPU performance and by how much.
PC Upgrade Path Planner
Get personalized recommendations for upgrading your PC based on your goals.
Storage Speed Comparison
Compare read and write speeds across different storage drive types.
RAM Configuration Optimizer
Find the optimal RAM setup for your motherboard and usage requirements.
PC Airflow Calculator
Analyze your case fan setup and optimize airflow for better cooling.
FPS Calculator
Estimate your frame rates for games based on your hardware specs.
Internet Speed Calculator
Calculate the internet speed you need based on your household usage.
Learn About PC Hardware
Clear guides for understanding how computers work.
Computer Fundamentals
Master the basics and how PCs work.
PC Gaming
Everything you need for an optimal experience.
Computer Hardware
Deep dive into PC components.
Computer Networking
Stay connected with confidence.
Computer Peripherals
Enhance your experience with the right accessories.
Computer Software
Master operating systems, programs, and applications.
Built for Real PC Users
Every calculator here was built to solve a real problem — the kind that comes up when you're mid-build, troubleshooting performance, or planning an upgrade. No sign-up required. No paywalls.
What our free PC tools cover
- Power supply sizing — Get accurate PSU wattage requirements before you buy, based on your actual components.
- CPU and GPU bottleneck detection — Find out whether your processor or graphics card is limiting your frame rates.
- Airflow and cooling optimization — Analyze your case fan configuration and fix airflow imbalances before they cause thermal throttling.
- FPS estimation — Predict your gaming frame rates across different titles and resolutions based on your hardware specs.
- RAM configuration — Determine the optimal memory setup for your motherboard, including channel configuration and frequency.
- PC upgrade planning — Get a prioritized upgrade roadmap based on your current system and performance goals.
- Storage speed comparison — Compare HDD, SATA SSD, and NVMe drives to understand the real-world impact of each upgrade.
- Internet speed requirements — Calculate the bandwidth your household actually needs based on simultaneous usage.
Who these tools are for
- PC builders planning their first or fifth build and want accurate hardware compatibility and power estimates before spending money.
- Gamers experiencing performance issues and trying to diagnose whether their CPU, GPU, or RAM is the limiting factor.
- Upgraders who want to know which component swap will deliver the biggest improvement without wasting budget on diminishing returns.
- IT professionals who need quick, reliable reference tools without logging into bloated software platforms.
- Students and enthusiasts learning how PC hardware works and wanting hands-on calculators to reinforce the concepts.
All tools run entirely in your browser. No data is sent to any server and no account is needed.
Whether you are fine-tuning a high-end gaming rig, stretching a tight budget across the most impactful upgrades, or simply trying to understand why your PC feels sluggish, these free PC tools give you the numbers you need to make confident decisions without guesswork.
Frequently Asked Questions
Are all the PC tools and calculators really free?
Yes. Every tool on this site is completely free to use with no sign-up, no subscription, and no hidden fees. They are funded by advertising and built to remain free for the PC community.
How accurate are the results from these calculators?
The calculators use component-level data and industry-standard formulas. Results are estimates based on typical usage patterns — real-world figures can vary depending on overclocking, ambient temperature, software load, and other factors. The PSU calculator, for example, includes a 20% headroom buffer by default, which is the standard recommendation for system stability.
Do I need to install anything to use these tools?
No installation required. All tools run directly in your web browser on any device — desktop, laptop, or mobile. No downloads, no plugins, no software to install.
Who builds and maintains these tools?
The tools are built and maintained by Marlo Strydom, an IT professional based in Tauranga, New Zealand, with hands-on experience in PC hardware, networking, and technical support. Each tool is reviewed and updated regularly to keep component data current.
Which tool should I use first if I'm building a new PC?
Start with the PSU Wattage Calculator to size your power supply correctly. Then use the CPU Bottleneck Calculator to check your CPU and GPU pairing. If you're gaming, the FPS Calculator gives you a realistic performance estimate before you commit to a build.
Can I use these tools on my phone or tablet?
Yes, all tools are fully responsive and work on any screen size. Whether you are checking PSU requirements on your phone mid-shopping or running a bottleneck check on a tablet, the calculators adapt to your display without any loss of functionality.
How often is the component data updated?
Component databases are reviewed and updated regularly as new CPUs, GPUs, and storage drives are released. If you notice a component missing from a calculator, use the contact form to flag it and it will be added in the next update cycle.
Are these tools useful for diagnosing an existing PC, not just new builds?
Absolutely. Most users come here to troubleshoot an existing system rather than plan a new one. The CPU bottleneck calculator is particularly useful for diagnosing performance issues, the airflow calculator helps identify cooling problems in aging builds, and the RAM configuration optimizer can reveal whether your current memory setup is running below its potential.
Professional IT Services Available
Need hands-on help? We also offer IT consulting, setup, and troubleshooting services for businesses in the Tauranga area.