About Casvia

Casvia makes simple, transparent financial calculators for people in the UK. Understand your money, plan with confidence.

What we do

Casvia is a small set of focused calculators covering savings, ISAs, tax, property and retirement. Every tool is designed around a few rules:

• Simple. One question at a time, plain-English results.
• Transparent. The formula and assumptions are shown on every page.
• UK-specific. Figures reference official GOV.UK and HMRC sources and state the tax year they apply to.
• Private by default. All calculations run in your browser. We have no accounts, no database and no tracking.
• Free. No sign-up, no paywall.

What we don't do

• We don't give personal financial, tax or investment advice.
• We don't recommend specific products, funds or providers.
• We don't collect or store anything you type into a calculator.

Why Casvia?

Too many finance sites bury the maths, nag you to sign up, or push products. Casvia goes the other way: open the page, type your numbers, see the answer and the formula behind it. If you want to understand how a number was reached, read the Methodology.

Casvia provides educational calculators and general information. It does not provide personal financial, tax or investment advice.