Free Homelab & PC Build Calculators — TechFuel HQ

TechFuel HQ tools

Browser-based calculators and pickers for homelab and PC decisions. The calculations run locally in your browser and require no account. Like the rest of TechFuelHQ, these pages use site-level analytics so I can see whether a tool is useful; the values you enter stay in the page and are not sent as calculator inputs.

Every tool entry links back to the article that justifies its catalog choices. The methodology behind every component pick is in the colophon.

Have a tool you’d like to see built? Email hello@techfuelhq.com.

Last updated: 2026-08-07.

Build & hardware

PC Builder: Parts Picker with Compatibility Checks

Interactive PC build picker with socket, chipset, RAM, PSU, and case-clearance checks, plus current Amazon and Newegg searches. CC BY 4.0 parts dataset.

Homelab + PC Build Budget Builder

Sort GPUs, NAS, and networking gear by your budget and what you actually need. Real 2026 prices, real watt draw, honest verdicts.

PSU Calculator: Power Supply Wattage Calculator

Free PSU calculator sized from your actual parts: pick CPU and GPU to see peak draw, minimum wattage, and the efficiency sweet spot. Runs in-browser.

PC Bottleneck Calculator: CPU vs GPU by Resolution (2026)

Is your CPU or GPU the frame-rate limit at 1080p, 1440p, or 4K? An honest, resolution-aware estimate built on Tom's Hardware benchmarks.

GPU Comparison Tool: Compare Any Two Graphics Cards (2026)

Compare any two graphics cards at 1080p, 1440p, or 4K: the real raster gap and where VRAM flips the result, built on Tom's Hardware benchmarks.

CPU Comparison Tool: Compare Any Two Gaming Processors (2026)

Compare any two CPUs for gaming head-to-head via the Tom's Hardware 1080p hierarchy: the real gap and why it shrinks at higher resolutions.

SSD Endurance Calculator: How Long Will Your SSD Last?

Estimate your SSD or NVMe lifespan from TBW or DWPD, daily writes, and write amplification. Built for homelab, Proxmox/ZFS, and NVR write loads.

Homelab capacity & cost

Homelab Power & Cost Calculator

Calculate your homelab's annual electricity cost, 3-year TCO, and savings vs cloud. Enter each device's idle and load watts, hours per day, and your rate.

Proxmox VM Capacity Planner

Enter host RAM, CPU cores, and VM profile to see how many VMs or LXC containers your Proxmox server can run, with ZFS ARC overhead included.

Docker Homelab RAM Planner

Calculate total RAM for your self-hosted Docker stack. Pick apps like Jellyfin, Nextcloud, Immich, n8n, and Home Assistant to see idle vs peak use and sizing.

NAS & RAID Capacity Calculator

RAID capacity calculator: usable storage, parity overhead, and fault tolerance for RAID 0/1/5/6/10 and ZFS RAIDZ1/2/3, compared side by side.

UPS Runtime Calculator

Enter your system load and UPS rating to estimate runtime in minutes. See if your UPS can handle a graceful shutdown and which models fit your target.

Frigate NVR Storage Calculator

Estimate disk space for a Frigate NVR by cameras, resolution, codec, and retention — plus the /dev/shm size Frigate needs. Continuous vs motion compared.

Self-Hosting Break-Even Calculator

Add your SaaS subscriptions, hardware budget, and electricity rate to see exactly when self-hosting pays for itself, month by month, over a 5-year projection.

Networking

Network Transfer Time Calculator

Estimate how long moving your data takes: pick size, link (1/2.5/10GbE, USB, Thunderbolt), and drive speed to see transfer time and your real bottleneck.

Data Usage Calculator: Estimate Your Monthly Internet GB

Estimate your monthly internet data usage in GB from streaming, gaming, video calls, and downloads - and whether you'll pass a 1.2 TB cap. Free, in-browser.

Subnet & CIDR Calculator: IP Ranges, Masks, Hosts

Enter an IPv4 address and CIDR prefix to get the network, broadcast, usable host range, subnet mask, wildcard, and host count — plus split a block into subnets.

PoE Power Budget Calculator: Will Your Switch Power It All?

Size a PoE switch for your APs, cameras, and phones. Add devices, cable length, and headroom to get the budget to buy — plus an 802.3af/at/bt reference.

Displays & gaming

DisplayPort & HDMI Bandwidth Calculator (2026)

Does your resolution, refresh rate, and color depth fit HDMI 2.0/2.1 or DisplayPort 1.4/2.1, with or without DSC? Verified effective bandwidths.

Monitor Size Calculator: Screen Width, Height & Desk Fit

Calculate a monitor's width and height from diagonal and aspect ratio - inches and cm - plus screen area and desk fit. Free, runs in your browser.

PPI & Pixel Density Calculator: Monitor Sharpness (2026)

Free PPI calculator: pixel density of any monitor from resolution and screen size, plus pixel pitch, a sharpness verdict, and scaling advice. Runs in-browser.

Aspect Ratio Calculator: Resolutions, Ultrawide & 16:9 (2026)

Calculate any aspect ratio or resolution: the exact ratio of a screen, ratio-to-pixels scaling, and why '21:9' is really 64:27 or 43:18. In-browser.

FOV Calculator: Convert Field of View Between Aspect Ratios (2026)

Convert game FOV between aspect ratios and between horizontal and vertical, with verified Hor+ scaling math for ultrawide and 16:9. Runs in-browser.

Mouse Sensitivity Converter & eDPI Calculator (2026)

Convert mouse sensitivity between CS2, Valorant, Apex and Overwatch 2 keeping the same cm/360 feel - plus eDPI and 360 distance. Runs in your browser.

Local AI

LLM VRAM Calculator

Find which local AI models fit your GPU: pick card, model size, quantization, and context length to estimate VRAM (weights + KV cache) and which quant fits.

Local LLM Speed Calculator: Estimate Tokens per Second

Estimate local LLM generation speed (tokens/sec) from your GPU bandwidth, model size, and quantization — the memory-bandwidth math behind real inference.