A number is only as useful as its assumptions
The calculators implement the methods described on their pages. They do not independently verify your inputs, retrieve current personal records or include rules that the page does not list. A correctly calculated scenario can still differ from a real bill, contract or financial account.
Financial examples
Interest rates and prices in examples are illustrative inputs. Growth scenarios are not forecasts or promised returns. A fixed-rate loan estimate excludes unlisted costs and does not approve a loan. Currency selectors label amounts; they do not convert exchange rates.
Dates and measurements
Date and age results use the Gregorian calendar and the counting conventions stated on the page. They do not establish a legal deadline or legal age. Unit conversion cannot improve the precision of the original measurement.
Check and report
Read the formula, worked example and limitations for the tool you use. If a result appears incorrect, send a reproducible report through Contact & corrections. No external professional certification or guarantee of fitness for a particular purpose is claimed.