Plain Finance
Straightforward calculators for real money decisions.
Every calculator here runs entirely in your browser — nothing you type is sent anywhere — and each one shows the assumptions behind its answer so you can check the working.
Mortgage & home
- Mortgage Payoff Calculator See how extra payments shorten your loan and cut total interest.
- Mortgage Calculator Your real monthly payment: principal, interest, tax, insurance and PMI.
- Refinance Calculator Break-even, lifetime cost, and whether a lower payment really saves.
- Amortization Schedule Calculator Every payment on any loan, split into principal and interest.