Contact
Email hello@numwise.co.uk. Steven Stewart reads every message.
Report a mistake
Tell us the page and what looks wrong. We check it against the source, usually within a few days, and record any fix on the changes page. Every calculator also has a "Spotted a mistake?" link at the bottom.
Suggest a calculator
If there's a sum you wish someone would do for you, tell us. Most new calculators start as suggestions.
Using our calculators on your site
Many calculators can be embedded on your own website for free. Look for "Use this calculator on your site" near the bottom of the page.
What we can't help with
We can't give personal financial, tax, legal, medical or veterinary advice, or answer questions about your own bill or account. For those, contact your supplier or a qualified professional.