Most financial calculators live inside bank websites, brokerage portals, or insurance company tools — all of which have an agenda. The ones that do not have an agenda often give you a number with no explanation of what it means or what you should do with it.
Does It Add Up? was built to give you the honest number, and enough context to know what to do with it. No upsells. No sign-up required. No account to create. Just the math, and a plain-English explanation of what it means for your specific situation.
Over 60 calculators across four categories:
Each calculator page includes an explanation of what the number means, how to interpret your result, practical next steps, and answers to the questions people actually have — not just the ones that are easy to answer.
The Does It Add Up? blog covers personal finance topics with the same approach: honest numbers, real context, no agenda. Articles connect directly to the calculators — so you can read about compound interest and immediately test your own numbers, or learn the debt avalanche vs. snowball debate and run your specific payoff plan.
Does It Add Up? is a product of Enthropic Data LLC, a software and data company. Our goal with this site is straightforward: give people tools that help them make better-informed financial decisions, without charging for the privilege or steering them toward a product.
Enthropic Data also builds AI-powered writing and planning tools — the "What next?" tools linked at the bottom of each calculator are those products. The first use is always free.
Every calculator on this site is built to give accurate estimates for planning purposes. They are not substitutes for personalized financial, medical, or legal advice. Tax calculations use current U.S. federal rates and representative state rates — your actual situation may differ. Health calculations (BMI, TDEE, body fat) use widely accepted formulas that work well for population averages but have known limitations at individual extremes.
If you find an error or a calculator giving unexpected results, let us know.