Calculators

Free financial calculators.

Built for pay that comes in pieces — salary, bonus, RSUs. Every formula is written on the page, and the numbers are tested against textbook values. No sign-up.

Pay and taxes

After-Tax Income CalculatorYour real take-home after federal, state, and FICA taxes. Handles bonuses and signing bonuses correctly. RSU Tax CalculatorFederal and state taxes on RSU vests. Compare grants across Google, Amazon, Meta, and more. Comp ComparisonCompare up to 4 offers side by side with RSU vesting schedules and 4-year projections. Sales Comp CalculatorActual monthly cash flow with commissions, accelerators, and real tax withholding.

Retirement

Mega Backdoor Roth CalculatorYour maximum after-tax 401(k) contribution under the 2026 IRS limits. Mega Backdoor vs. Traditional 401(k)After-tax retirement value of mega backdoor Roth vs. traditional or Roth 401(k) over time. FatFIRE Withdrawal CalculatorTax-aware retirement drawdown with inflation-adjusted spending and portfolio survival.

Growth and time

Compound Interest CalculatorProject investment growth with multi-scenario modeling, contribution changes, and lump-sum additions. Time Value of Money CalculatorSee how inflation, investing, and timing affect your money over a lifetime — present value, future value and the cost of waiting.

Everyday money

50/30/20 Budget CalculatorSplit your income into needs, wants, and savings with customizable categories. Debt Payoff CalculatorAvalanche vs. snowball, and your debt-free date. Rent vs. Buy CalculatorThe true cost of buying a home vs. renting and investing the difference.