Run the numbers before you run the risk.
27 interactive calculators for real money decisions — investing, options, retirement, debt, and savings. No sign-up. No paywall.
Shareable results · Free forever
Investing
View Investing guide
Compound Growth Calculator
See what regular contributions plus time can actually do.
Stock Position Sizer
Turn a risk % rule into an exact share count.
Stock Return (CAGR) Calculator
Total return, CAGR, and price-vs-total-return with dividends.
Dollar-Cost Averaging Calculator
Model monthly investing vs a lump sum — and see what compounding really does.
Dividend Yield & YOC Calculator
Current yield, yield-on-cost, and what dividend growth does over 20 years.
Net Worth Calculator
Itemize every asset and liability — with an asset/liability breakdown bar.
Options
View Options guide
Options Income Calculator
Premium, ROC, annualized return and assignment scenarios for covered calls and CSPs.
Options P/L Calculator
Interactive payoff diagrams for long calls, long puts, covered calls, and CSPs.
Wheel Income Annualizer
Project monthly and annual income from running the wheel on a fixed capital base.
Retirement
View Retirement guide
Retirement Savings Calculator
Project your nest egg and your sustainable annual income at retirement.
401(k) Contribution Calculator
Employer match, contribution %, projected balance — and free money left on the table.
Roth vs Traditional Calculator
After-tax value both ways — which wins for your tax situation, and by how much.
Retirement Withdrawal Calculator
Year-by-year balance and depletion year for a given spend rate, return, and inflation.
Dividends
View Dividends guide
Debt & Loans
View Debt & Loans guide
Mortgage Payment Calculator
Monthly P&I, taxes, insurance, HOA — plus total interest and payoff date.
Debt Payoff Calculator
Avalanche vs snowball across all your debts — see the day each one dies.
Credit Card Payoff Calculator
Payoff time and total interest — and what paying more each month actually saves.
Auto Loan Calculator
Payment, total interest, and total cost after down payment, trade-in, and sales tax.
Student Loan Payoff Calculator
Payoff date and interest saved when you throw an extra payment at it.
Refinance Breakeven Calculator
Monthly savings, breakeven month, and lifetime cost of refinancing your mortgage.
Home Affordability Calculator
Max home price you can afford at a given DTI — with the payment breakdown behind it.
Savings & Budget
View Savings & Budget guide
Savings Goal Calculator
Required monthly deposit to hit a target — or the date you hit it.
Emergency Fund Calculator
3, 6, or 12 months of coverage — how far you are and how long to fill it.
Inflation Calculator
Purchasing power over time — both directions, past and future.
50/30/20 Budget Calculator
Split monthly income into needs, wants, and savings — with editable percentages.
CD Ladder Calculator
Maturity schedule and blended APY across any number of ladder rungs.
Rent vs Buy Calculator
Full-cost comparison over your time horizon — with the crossover year.