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Money calculators that show their work.
Mortgage, paycheck, loans, savings, sales tax and more. Every result comes with the formula behind it and a plain-English explanation, so you understand the number — not just see it.
Example · $400,000 home, 20% down, 6.5%, 30 yrs
Estimated monthly payment
$2,547.62
- Principal & interest
- $2,022.62
- Property tax
- $400.00
- Home insurance
- $125.00
- Total interest over 30 yrs
- $408,142
Most used
Home
Mortgage Calculator
Free mortgage calculator. See your full monthly payment including principal, interest, property tax, insurance and HOA, plus total interest over the life of the loan.
Income
Paycheck Calculator
Free 2026 paycheck calculator. Enter your salary, filing status and pay frequency to see your take-home pay after federal income tax, Social Security and Medicare.
Savings
Compound Interest Calculator
Free compound interest calculator with monthly contributions and a year-by-year table. See how your savings or investments grow over time at any rate and compounding frequency.
Loans
Debt Payoff Calculator
Free debt payoff calculator. Enter all your debts, choose snowball or avalanche, and see your debt-free date, total interest, and how much an extra payment saves.
Why DollarCalcs
Most online calculators give you a number and an ad. We give you the number, the formula that produced it, worked examples with real figures, and answers to the questions people actually ask. Nothing is stored, nothing requires an account, and every tool runs entirely in your browser so results appear as you type.
The calculators are built and checked by people who do this math for a living — payroll, sales tax, loan amortization — and the tax tables are updated each January. If a result looks wrong, tell us; we fix mistakes fast.