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The money calculators worth bookmarking
Loan payments, mortgage costs, retirement withdrawal, debt payoff, take-home pay and compound growth — each with the formula shown, so you can check the answer yourself.
Most financial questions reduce to a handful of formulas. These calculators show the arithmetic on
the page — the formula, a worked example and the assumptions — so you can verify the result instead of
trusting a black box.
Borrowing
Loan and mortgage payments — monthly payment, total interest and an amortisation
schedule.
Refinance break-even — how many months before the lower rate pays off the closing
costs.
Debt payoff — how long a balance takes to clear and what extra payments save.
Earning and saving
Take-home pay — federal brackets, FICA and the standard deduction.
Self-employment tax — the 15.3% both-halves calculation for 1099 income.
Compound interest and savings goals — what a monthly contribution becomes.
Retirement
Retirement withdrawal (the 4% rule), 401(k) growth, dividend income and the nest egg needed for a
target income.
All 75 calculators are free, need no account and run entirely in the browser:
Tekify Calculators.