Personal-finance maths, without the email wall

Four calculators that show their working. Everything runs in your browser — nothing you type is sent anywhere.

Debt payoff calculatorSnowball vs avalanche on your actual debts — payoff date and total interest. How much house can I afford?Lender cap and comfort cap, side by side. Pay off debt or invest?Compare both, side by side, in pounds and years. Coast FIRE calculatorHow much you need invested today to stop contributing. Emergency fund sizeMonths of runway based on your actual risk, not a rule of thumb. Real hourly wageWhat your job actually pays after commute, tax and job costs.

Why another calculator site?

Most personal-finance calculators either hide the assumptions or bury the answer under an email wall. These do neither: every input is visible, the maths runs locally in your browser, and the answer appears immediately. No signup, no ads, no data collection.