About WorthCalc

2026-07-15

WorthCalc exists because most "is it worth it" questions get answered with gut feeling instead of arithmetic. Is that 0% installment plan actually free? Are your subscriptions quietly eating a month's rent every year? Would a Costco membership pay for itself at your spending level? These are math problems, not opinions — so we built calculators instead of writing another listicle.

Every tool on this site runs entirely in your browser. There is no backend that receives the numbers you type in — no account, no upload, no server round-trip. You can check the math, close the tab, and nothing you entered ever leaves your device (aside from anything you explicitly choose to save locally for next time).

We currently publish eight calculators covering everyday money decisions: true APR on installment and BNPL plans, subscription cost audits, Costco membership break-even, EV vs. gas total cost of ownership, rent vs. buy, commute cost comparison, the "latte factor" daily habit calculator, and cashback credit card break-even. Each one is free, ad-supported, and built to give you a plain verdict — not just a pile of numbers.

WorthCalc is independently run. We are not a bank, lender, brokerage, or financial advisor, and nothing on this site is investment or financial advice — see our disclaimer for details. If you spot a calculation that looks wrong or have a tool idea, reach us at the address on the contact page.

The calculators simplify real-world choices into estimates. They cannot know your full financial situation, local taxes, contract terms, credit profile, risk tolerance, or future price changes. For major decisions involving debt, housing, taxes, insurance, investments, or legal rights, please confirm the current terms and speak with a qualified professional.

How we build and review a calculator

Every calculator starts by separating the question into five parts: user inputs, formulas, editable assumptions, outputs, and limitations. Default numbers demonstrate the interface; they are not market averages or personal recommendations. Before making a decision, replace them with your own bill, contract, or current quote. Each tool page publishes its methodology, assumptions, worked example, limitations, and last-reviewed date so you can trace how the result was produced instead of accepting a verdict on faith.

Before publication, we test at least three kinds of cases: a normal input, a boundary close to zero or break-even, and an extreme input that could make the result invalid. We also check mobile controls, input labels, estimate language, and exported results. When a tool depends on interest rates, membership fees, taxes, reward rules, or product terms, the page must state that those external conditions can change and that the current official terms still need to be verified.

What the result cannot decide for you

A calculator compares only the factors you enter. It does not know your emergency savings, job stability, family obligations, health needs, credit profile, or risk tolerance. A result that looks favorable still needs a cash-flow, exit-cost, and worst-case check. An unfavorable result does not mean convenience, time, accessibility, or quality of life has no value. WorthCalc makes assumptions visible; the final decision remains yours.