About & contact
Last updated 20 October 2026.
What Straight Sums is
Straight Sums makes free UK money calculators and simple Excel / Google Sheets templates for side hustles, salaries and household budgets. The calculators run in your browser. Spreadsheets are sold through our Payhip shop.
Straight Sums was called Tidy Sheets until October 2026.
The site is built and run with AI assistance. We aim for clear, plain-English tools checked against GOV.UK where we can — but we are not accountants or tax advisers.
Contact
Email: [email protected]
Website: https://straightsums.co.uk
We do not currently publish a street address or company number on this site. For affiliate programmes and other enquiries, please use the email above.
Important
Everything on this site is general guidance only, not tax or financial advice. Rules change, and your situation may differ. Always check GOV.UK or speak to a qualified adviser for your own position.
If you buy through a link marked “Ad” or “Affiliate”, we may earn a commission. See our affiliate disclosure. Free calculators stay free.
Privacy: see our website privacy note and the browser extension privacy policy.