Frequently asked questions
Questions about the calculators, the reader data, how we check figures and what we do with information. If your question is not here, the contact page reaches us directly.
The three answers people need most. No, you do not need an account for anything. No, nothing you type into a calculator is ever transmitted or stored. Yes, everything on this site is free, and it stays free because of advertising.
Using the calculators
Do I need an account to use anything on this site?
Is everything really free?
Are the figures I type into a calculator sent anywhere?
Why does the result differ from another calculator I found?
Can I use these on my phone?
A calculator is giving me an answer that looks wrong. What should I do?
Accuracy and how we check things
How current are the tax figures?
Which grading scales do the academic tools support?
Do you update tools when rules change?
Can I rely on a result for an official purpose?
How do I report an error?
The reader data section
Where does the price data come from?
Is it anonymous?
How reliable is it?
Why show the median rather than the average?
How do I contribute?
Can I have something I submitted removed?
Privacy, advertising and content
What do you actually collect about me?
Do you use cookies?
Do you sell my data?
Do you accept payment to recommend things?
Can I republish your articles or calculators?
Are you affiliated with any university or government agency?
Suggestions and getting help
Can you build a calculator I need?
Can you help with my specific application or result?
How often do you publish new articles?
How do I find something quickly?
Still stuck?
Write to us through the contact page. We read everything and usually reply within two or three working days. Reported errors get looked at first.
Browse instead
The tools index lists all 38 calculators by category, and the data section shows what readers report paying across Nigeria.
The legal pages
Our privacy policy, terms and disclaimer are written to be read rather than skipped.