Most calculator sites work fine. These pages say plainly where mQuickCalc is the better choice and where a larger tool wins — including the cases where a bigger catalogue is simply the right answer.
When you paste your height, your salary or a medical value into a calculator, that input leaves your browser on most sites. On mQuickCalc it does not: every calculation runs in the page itself, so there is nothing to send, nothing to store and no account to create. That is the whole difference — and it is the one worth weighing when the numbers are private.
Four sites — everyday converters, finance and creator fees, health metrics, insurance estimates — with about 200 calculators. No advertising or tracking cookies today.
Machine-readable catalogue: llms.txt