The result should never be a black box.

Calculator inputs are processed in your browser. centy.cloud does not require an account and does not send salary, debt, savings, or home-price inputs to a centy.cloud database.

Standard hosting and security systems may still receive ordinary request information such as an IP address or browser details. Calculator values are not included in those page requests.

Each tool uses deterministic calculation functions. The same validated inputs produce the same result. Pages explain the major formula, what is included, and which real-world costs are outside the model.

Inputs are constrained to finite, reasonable ranges before calculation. This prevents invalid numbers from producing misleading infinities, negative timelines, or broken charts.

Calculations retain more precision internally than the interface displays. Currency results are generally rounded for readability, while schedules may reconcile the final payment to avoid showing a remaining balance caused only by display rounding.

A displayed estimate should not be treated as a quote. Lenders, tax agencies, payroll systems, and financial institutions may use additional rules, daily timing, or rounding conventions.

Tools that rely on a tax year or policy assumption identify that year on the calculator page. We update date-sensitive logic when source material changes and show the scope of taxes or fees that are not included.

Investment returns, inflation, property taxes, insurance, and similar inputs are scenarios supplied by the reader. They are not predictions or promises from centy.cloud.

Before a calculator change is published, we check known examples, zero and boundary values, unit conversions, payoff completion, and consistency between totals, tables, and charts.

Calculator explanations and related guides are reviewed alongside the logic so the interface does not promise more precision than the formula can support.