All Calculators

Eight tools, one standard: every calculator answers live as you type, charts the result, publishes its formula, and includes a worked example you can verify by hand.

  • Compound Interest Calculator

    The flagship. Project savings or investment growth with monthly contributions — live chart, year-by-year table, doubling time, and the crossover point where interest out-earns your deposits.

    Best for: Long-term savers and first-time investors

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  • Retirement Calculator

    Your nest egg at any retirement age, its value in today's dollars, and the monthly income the 4% rule says it could support.

    Best for: Anyone wondering “am I on track?”

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  • Loan Calculator

    Monthly payment, total interest, amortization table, and the exact savings from extra payments on any fixed-rate loan.

    Best for: Auto, personal, and student loans

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  • Mortgage Calculator

    The full monthly house payment — principal, interest, taxes, insurance — plus PMI awareness and the income the 28% rule implies.

    Best for: House hunters comparing price points

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  • Debt Payoff Calculator

    Up to four debts, avalanche vs. snowball side by side: payoff date, total interest, and your exact payoff order under each.

    Best for: Anyone juggling multiple balances

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  • Savings Goal Calculator

    The exact monthly amount to hit any goal by any date, with your APY doing part of the work — plus weekly and daily equivalents.

    Best for: Down payments, cars, weddings, trips

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  • Emergency Fund Calculator

    A personal safety-net target from essential expenses and income stability, with staged milestones and a funding timeline.

    Best for: Building your first safety net

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  • 50/30/20 Budget Calculator

    Split any paycheck into needs, wants, and savings with city-adjusted presets — and see what your savings share compounds into.

    Best for: Getting started with budgeting

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Not sure where to start?

Follow the money order most planners recommend: split your paycheck with the 50/30/20 calculator to find your monthly savings number → build a starter cushion with the emergency fund calculator → clear expensive debt with the debt payoff calculator → then point what's left at the compound interest and retirement calculators and let time do the heavy lifting.