Understand your money one decision at a time
Build a personal financial model instead of guessing.
Use 1093 calculators and research tools for financial decisions, then follow them from monthly cash flow to a retirement model.
Formula, assumptions and interpretation
Personal finance calculators
1093 tools
Company research and investment scenarios
1 toolBudgeting and financial resilience
6 toolsMonthly budget
Compare monthly take-home income with spending and calculate the amount left to save or repay debt.
Open calculator Runs locallySavings rate
Measure the share of take-home income retained as savings during a month.
Open calculator Runs locally50/30/20 budget
Split monthly take-home income into illustrative needs, wants and savings or debt-payment amounts.
Open calculator Runs locallyEmergency fund target
Estimate an emergency reserve from essential monthly expenses and a selected number of months.
Open calculator Runs locallyEmergency fund coverage
Calculate how many months current emergency savings could cover essential spending.
Open calculator Runs locallyNet worth
Subtract total liabilities from total assets to calculate a current personal net-worth snapshot.
Open calculatorDebt and repayment
8 toolsDebt-to-income ratio
Compare required monthly debt payments with gross monthly income.
Open calculator Runs locallyLoan payoff time
Estimate the time and total interest required to repay a fixed-rate balance with fixed monthly payments.
Open calculator Runs locallyExtra debt payment
Compare a normal repayment schedule with the same debt after adding a fixed extra monthly payment.
Open calculator Runs locallyLoan payment
Calculate a fixed monthly loan payment, total repayment and total interest from principal, rate and term.
Open calculator Runs locallyLoan amortization
Break a fixed-payment loan into first-payment interest, principal reduction and remaining balance.
Open calculator Runs locallyAuto loan
Estimate vehicle financing after a down payment or trade-in and calculate the monthly payment.
Open calculator Runs locallyLoan APR
Estimate annual percentage rate from cash received, upfront fees, payment amount and term.
Open calculator Runs locallyCredit card payoff
Estimate payoff time and interest when making a fixed monthly credit-card payment.
Open calculatorSaving and investing
5 toolsCompound savings growth
Project how a lump-sum saving could grow through annual compound returns.
Open calculator Runs locallyMonthly savings growth
Project an initial balance plus equal end-of-month contributions at a constant annual return.
Open calculator Runs locallyInvestment fee impact
Compare projected compound growth before and after an annual percentage fee.
Open calculator Runs locallyInvestment CAGR
Calculate the constant annual growth rate connecting a starting investment to an ending value.
Open calculator Runs locallySavings goal time
Estimate how long current savings and monthly contributions take to reach a target.
Open calculatorHousing and retirement
7 toolsMortgage payment
Estimate monthly principal and interest for a fixed-rate repayment mortgage.
Open calculator Runs locallyHome down payment
Convert a home price and down-payment percentage into cash required and mortgage principal.
Open calculator Runs locallyHome affordability by payment
Estimate a mortgage principal from gross income, a selected housing ratio, rate and term.
Open calculator Runs locallyRetirement savings target
Estimate a portfolio target from annual retirement spending and a selected withdrawal rate.
Open calculator Runs locallyRequired retirement contribution
Estimate the equal monthly contribution required to reach a target after allowing current savings to grow.
Open calculator Runs locallyRetirement withdrawal income
Translate a portfolio balance and selected annual withdrawal rate into annual and monthly income.
Open calculator Runs locallyRent versus buy
Compare projected rent with mortgage payments and estimated home equity over a selected period.
Open calculatorClear answers
About the personal finance tools
Where should a personal-finance beginner start?
Start with monthly cash flow, then build an emergency reserve before studying debt, compound growth, housing and retirement. The Personal Finance from Zero path puts all 1092 lessons in that order.
Are my financial figures uploaded?
No. Calculations run locally in your browser. Values are not transmitted or stored unless you explicitly choose an account feature that saves work.
Is this financial or investment advice?
No. These are transparent educational models. Returns, inflation, fees, tax, law and personal circumstances can change real outcomes, so verify important decisions with qualified guidance.