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What Utilia Is
Utilia is a set of calculators for the money decisions US households actually face: what a mortgage will cost, when to claim Social Security, how much a Roth conversion will add to this year's tax bill, whether to pay off the card with the highest rate or the smallest balance first. It also covers the material estimates behind common home projects, like concrete, paint, flooring and fencing.
Every calculator shows its work. Each one names the formula it uses and, where an official rule applies, links to it: IRS publications for tax brackets, RMDs and 72(t) distributions, Social Security Administration rules for claiming ages and spousal benefits, CFPB guidance for mortgages and closing costs. If you want to check a result, you can.
Who Builds It
Utilia is built and maintained by one person, Akshaya Panda, an engineer. There is no editorial team. Each calculator is tested against worked examples computed independently before it is published, and the page records the date it last changed.
That is also why the site cites its sources rather than asking for trust: the author is not a financial adviser, accountant or tax professional. The calculator methodology and editorial policy explain how tools are built, checked and corrected.
How to Use It
Search for a tool above or browse by topic. Calculations run in your browser; nothing you enter is sent to a server or stored. Below each calculator you'll find the formula, a worked example and answers to common questions. For the bigger picture, like how the 4% rule works or when refinancing pays off, the finance guides go into more depth and link to the matching calculator.
Important: These are educational estimates, not financial, tax or legal advice. For decisions involving large sums, like a mortgage, a retirement plan or a tax filing, check the result with a licensed professional.