Free online tools for everyday decisions
Room sizes, material quantities, loan figures and unit conversions — worked out on the page, with the method shown. No sign-up, no app, nothing to pay.
Try: room area EMI GST feet to metre paint
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All categories →Popular tools
All tools →6 tools are available now; 11 more are being built. Entries marked Planned are not live yet.
Common questions
Do I need an account to use these tools?
No. Every calculator runs from the page you are on. There is no sign-up, no app to install and nothing to pay.
Are the results saved anywhere?
No. The values you enter are used to produce the result and appear in the page address so you can share or bookmark it. They are not stored against you.
How accurate are the calculations?
Each tool states the formula it uses and the assumptions it makes. They are good estimates for planning; check anything you are going to spend money on against a supplier quote or a professional.
Can I use the tools on a phone?
Yes. Every page is built to work at phone width, and the calculators work the same way there as on a desktop.
Missing a calculator you need?
Tell us what you were trying to work out and we will look at building it.