Convert Units Online — Length, Weight, Temp, Speed, Data
GhostTool's free online unit converter lets you switch between metric and imperial units for length, weight, temperature, area, speed, and data — instantly and entirely in your browser. No sign-up, no tracking, no round-trips to a server. It's a fast web utility you can bookmark and use offline.
Why this tool is useful
- Convert between metric and imperial without remembering formulas.
- Great for cooking, travel, engineering, and schoolwork.
- Works offline once loaded — perfect on slow or metered connections.
How it works (client-side)
- Pick a category (length, weight, etc.) and a source + target unit.
- Type your value — the result updates live as you type.
- All math runs locally in your browser; nothing is uploaded.
Frequently asked questions
Is the unit converter free?
Yes — completely free, with no ads, no sign-up, and no usage limits.
Does it work offline?
Once the page is loaded, every calculation runs client-side, so it keeps working without a network connection.
Which units are supported?
Length, weight, temperature, area, speed, and data storage, with metric and imperial options throughout.