About DotFixer

The problem this site is built around

Most PC problems are not really about knowing how to hold a screwdriver. They are about numbers you cannot see and answers scattered across ten different browser tabs. Your brand-new 1 TB drive shows up as roughly 931 GB and you wonder if you were shorted. A connection is rated “100 Mbps” but you have no feel for whether a download is two minutes or two hours. You are picking a power supply and every forum thread names a different wattage. You are staring at a subnet mask trying to work out which addresses are even usable. DotFixer exists to answer exactly those small, concrete questions — the ones that sit between you and a finished fix.

How the tools help

DotFixer is, first and foremost, a set of six free calculators that run right in your browser. Each one takes a real troubleshooting question and hands back a grounded number instead of a guess:

• The Data Storage Unit Converter moves between bits, bytes, KB, MB, GB, TB, and PB in both the decimal (SI, 1 KB = 1000 B) and binary (IEC, 1 KiB = 1024 B) systems — and shows you precisely why that “missing” drive capacity was never missing at all.
• The Download Time Calculator turns a file size and a connection speed into an honest time estimate, handling the megabit-versus-megabyte trap (100 Mbps ≈ 12.5 MB/s) and allowing for real-world overhead.
• The PC Power Supply (PSU) Wattage Calculator adds up the draw of your CPU, GPU, RAM, drives, and fans, then suggests a supply wattage with roughly 30% headroom, rounded to a common size for efficiency and future upgrades.
• The IP Subnet Calculator takes an IPv4 address plus a CIDR prefix or subnet mask and works out the network and broadcast addresses, netmask, wildcard mask, usable host range, and host counts.
• The Screen Resolution & PPI Calculator turns a resolution and a diagonal size into pixel density (PPI), aspect ratio, total megapixels, and the matching display standard so you can compare two screens honestly.
• The Password Strength Checker estimates entropy in bits and an offline crack time from a password’s length and character variety. It runs entirely in your browser and never sends or stores what you type.

Around the tools sit our written guides. The blog works through practical repair and maintenance questions in plain language, and the learnsection collects the background — storage, bandwidth, power, networking, and display basics — that makes the calculators make sense. If you want the longer view, the Museum of Computing & the PC traces the machines and ideas that built the personal computer, from ENIAC to the graphical desktop, with every entry, image, and fact drawn from Wikipedia and Wikimedia Commons.

What DotFixer is, and what it is not

DotFixer is an independent website, supported by advertising, that keeps every tool and article free to use. It is not a repair shop and not a help desk: we do not perform physical repairs, recover data, or log in to your machine. The calculators follow established computing and networking conventions, but their results are estimates based on the figures you enter — real outcomes depend on your specific hardware, drivers, firmware, and configuration. Treat everything here as general educational information, not professional IT, data-recovery, or security advice. DIY repair carries real risk, so back up your data first, take proper anti-static and electrical precautions, and consult a qualified technician for critical repairs or irreplaceable files. We are not affiliated with any hardware manufacturer, operating-system vendor, or standards body we reference; names like Windows, or specific display and networking standards, appear only to explain how the tools work.

Spotted a mistake, or want a tool that does not exist yet? That kind of note is genuinely useful — here is how to reach us.