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Finance Calculators

Mortgage, tax, retirement, savings, loans — every formula shown and explained.

19 calculators — all free, formula included
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Auto Loan Calculator
Monthly car payment, total interest, and total cost from price, down payment and rate.
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Personal Loan Calculator
Monthly payment and total repayment cost for any personal loan — 1 to 7 year terms.
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Loan Calculator
Standard loan amortization — PƗ[r(1+r)^n]/[(1+r)^n-1] formula shown.
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Compound Interest Calculator
Daily, monthly, or annual compounding with optional regular contributions.
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Simple Interest Calculator
I = P Ɨ r Ɨ t — straightforward interest for loans and short-term savings.
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Savings Calculator
Project savings growth with regular contributions. Includes goal tracker.
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Tax Calculator 2024
Federal income tax, state tax, and FICA using 2024 IRS brackets. Shows effective rate.
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Paycheck Calculator
Net take-home pay per paycheck after all deductions — 2024 tax brackets.
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401k Calculator
Project 401k balance at retirement with employer match and compound growth.
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Retirement Calculator
FIRE number and retirement readiness across multiple countries.
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FIRE Calculator
Financial Independence number — 6 countries, 4% safe withdrawal rate.
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Credit Card Payoff Calculator
How long to pay off your balance and total interest paid at any monthly payment.
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Credit Card Interest Calculator
Daily, monthly, and annual interest cost on any credit card balance.
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Amortization Calculator
Full payment-by-payment amortization schedule for any loan or mortgage.
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Net Worth Calculator
Total assets minus liabilities — know exactly where you stand financially.
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Student Loan Calculator
Monthly payments, total interest, payoff timeline with term comparison
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Budget Calculator (50/30/20)
Monthly budget planner — needs, wants, savings with real-time tracking
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Rent Calculator
How much rent can you afford? 30% rule with full monthly budget breakdown
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15 vs 30 Year Mortgage
Side-by-side comparison — monthly payment, total interest saved
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