Finance Calculators
Calculators for the big money decisions. Each page shows the method behind its numbers, so you can check the math yourself.
For a home, Mortgage Affordability Calculator applies the 28/36 rule lenders use, Mortgage Payment Calculator gives the monthly payment and total interest, Amortization Schedule Calculator lays out every month’s principal and interest, and Refinance Break-Even Calculator shows how long closing costs take to pay for themselves. For saving, Compound Interest Calculator, 401(k) Calculator, and Retirement Calculator project growth over time. Auto Loan Calculator and Credit Card Payoff Calculator show what borrowing really costs, and Zakat Calculator applies the 2.5% rate to all of your net zakatable wealth once it reaches the nisab. The results are estimates, not financial advice.
All finance calculators
Mortgage Payment Calculator
Estimate your monthly mortgage payment, total interest, and total cost from loan amount, rate, and term — with the exact formula shown.
Mortgage Affordability Calculator
See how much house you can afford with the 28/36 rule lenders use — from income, debts, down payment, rate, and term.
Refinance Break-Even Calculator
Find how many months until refinance closing costs pay for themselves in monthly savings — or whether they never do.
HELOC Calculator
Estimate your home equity line from value, mortgage balance, and CLTV limit — then see the jump from interest-only to repayment payments.
Amortization Schedule Calculator
Full month-by-month amortization schedule with the interest/principal split, running balance, and one-click CSV export.
Extra Mortgage Payment Calculator
See how much sooner an existing mortgage ends and how much interest you save with extra monthly, yearly, or one-time principal payments.
401(k) Calculator
Project your 401(k) balance at retirement — see what you contribute, what your employer match adds, and what compounding growth delivers.
Retirement Calculator
Find your FI number (25× expenses) and how many years of saving it takes to reach financial independence, with a 5-year projection table.
Compound Interest Calculator
See how monthly compounding grows a starting amount plus monthly contributions — future value, total interest, and a year-by-year growth table.
Zakat Calculator
Calculate zakat on cash, gold, silver, investments, and business assets — nisab from today’s metal prices, 2.5% on net wealth, any currency.
Auto Loan Calculator
Estimate your monthly car payment with sales tax and trade-in included — plus total interest and the true total cost of the loan.
Credit Card Payoff Calculator
See how many months a fixed payment takes to clear your card balance, the total interest, and what doubling the payment saves.
Loan & EMI Calculator
Work out the monthly payment (EMI) on any fixed-rate loan — total interest, payoff date, APR with fees, and a year-by-year balance table.
Rent vs Buy Calculator
Compare the full cost of renting vs buying over your stay — mortgage, taxes, upkeep, rent increases, sale proceeds, lost returns — and the break-even year.
Rental Property Calculator
Run the numbers on a rental: NOI, cap rate, cash flow, cash-on-cash return, DSCR, gross rent multiplier, and gross yield, with every formula shown.