Financial calculators & tools
Free, fast, and built on the same verified math that powers our options analytics and SEC-filing research. No login required.
Options
Butterfly Spread Calculator
Three-strike tent payoff with a doubled middle leg.
Collar Strategy Calculator
Stock with a protective put and a covered call paying for it.
Options Break-Even Calculator
Break-even price, max profit, max loss, and required move for any option contract.
Options Profit Calculator
What an option is worth at any stock price on any date before expiration.
Options Pricing Calculator (Black-Scholes)
Theoretical option value and full Greeks with every input editable.
Options Chain Viewer
Full chains with bid/ask, volume, open interest, IV, and Greeks.
Covered Call Calculator
Premium yield and annualized return if called or expired.
Cash-Secured Put Calculator
Income yield and effective purchase price for selling puts.
Vertical Spread Calculator
Max profit, loss, and break-even for bull call, bear put, bull put, and bear call spreads.
Iron Condor Calculator
Net credit, both break-evens, and capped risk for a four-leg condor or butterfly.
Straddle and Strangle Calculator
Both break-evens and the move a stock must make for a long or short straddle to pay.
Expected Move Calculator
Implied move around earnings from straddle prices.
Stocks
Stock Return & CAGR Calculator
Total return and compound annual growth rate between two values.
Average Down Calculator
New cost basis after adding shares at a different price.
Position Size Calculator
Shares to buy from account size, risk %, and stop distance.
Dividend Income & DRIP Calculator
Income and growth from dividends, with and without reinvestment.
Fundamentals
WACC Calculator
Weighted average cost of capital, with cost of equity from CAPM.
Reverse DCF Calculator
The free cash flow growth rate today's share price already assumes.
Dividend Discount Model Calculator
Gordon Growth valuation for a steady dividend payer.
DuPont ROE Calculator
ROE split into margin, asset turnover, and leverage.
Margin of Safety Calculator
The buy price that leaves room for your valuation to be wrong.
EV/EBITDA Calculator
Enterprise value and the multiple that ignores capital structure.
Company Research & Financials
Full filing history from SEC EDGAR: revenue, EPS, margins, cash flow, dilution.
DCF Calculator
Discounted cash flow valuation with terminal value sensitivity.
Stock Screener
Filter companies on growth, margins, Rule of 40, ROE, leverage, and dilution from SEC filings.
Stock Comparison Tool
Head-to-head fundamentals for any two companies.
Graham Number Calculator
Ben Graham's intrinsic value estimate from EPS and book value.
Real Estate
Cap Rate Calculator
Capitalization rate and net operating income from rent, vacancy, and expenses.
Cash-on-Cash Return Calculator
Annual cash flow against cash invested, plus the DSCR lenders underwrite to.
Rental Property ROI Calculator
Cash flow, loan paydown, and appreciation combined into one annualized return.
BRRRR Calculator
How much capital a refinance returns, and how much stays trapped in the deal.
1031 Exchange Calculator
Capital gains and depreciation recapture a like-kind exchange defers.
Savings & Growth
Emergency Fund Calculator
Target from essential spending, current cover, and time to get there.
CD Ladder Calculator
Staggered maturities, blended yield, and how often cash returns.
APR to APY Calculator
Convert between the stated rate and the effective rate.
College Savings Calculator
Inflated cost of college and the contribution that closes the gap.
Compound Interest Calculator
Growth of a starting balance with regular contributions over time.
Dollar-Cost Averaging Calculator
What investing a fixed amount every month grows into.
Fund Fee Drag Calculator
What a fund's expense ratio really costs: two funds' ending balances on identical contributions.
Savings Goal Calculator
The monthly amount needed to reach a target by a date.
Rule of 72 Calculator
How long money takes to double at a given return.
Inflation Calculator
What a dollar amount is worth across years of inflation.
Loans & Debt
How Much House Can I Afford?
The price your income supports under the 28/36 rule, taxes included.
Rent vs Buy Calculator
Which costs less over your time horizon, with opportunity cost counted.
Debt-to-Income Ratio Calculator
Front-end and back-end DTI against conventional and FHA guidelines.
Extra Mortgage Payment Calculator
Interest and years saved by paying extra, and what biweekly really does.
Loan Payoff Calculator
Time and interest saved by paying extra on any loan.
Mortgage Calculator
Monthly payment with taxes, insurance, and PMI, plus amortization.
Credit Card Payoff Calculator
Payoff time and total interest at any monthly payment.
Refinance Break-Even Calculator
Months until refinancing closing costs pay for themselves.
Debt Snowball vs. Avalanche Planner
Compare payoff strategies across multiple debts.
Retirement
Roth vs Traditional Calculator
After-tax outcomes for both, with the traditional tax break invested.
RMD Calculator
Required minimum distribution from the IRS Uniform Lifetime Table.
Coast FIRE Calculator
The balance after which compounding alone reaches your target.
Retirement Savings Calculator
Project a nest egg from contributions, match, and growth.
401(k) Calculator with Employer Match
Balance at retirement including the full employer match.
FIRE Calculator
The savings level where work becomes optional, and when you reach it.
4% Rule / Safe Withdrawal Calculator
Sustainable annual spending from a portfolio.
Income & Salary
Self-Employment Tax Calculator
Social Security and Medicare on business profit, and the deductible half.
1099 vs W-2 Calculator
The contract rate that actually matches a salary offer after all costs.
Salary to Hourly Calculator
Convert annual salary to hourly, weekly, and monthly pay.
Take-Home Pay Estimator
Estimated paycheck after taxes and deductions.
RSU Value Calculator
Vesting schedule value and sell-to-cover estimates.
Bonds & Rates
Business & Finance
Margin vs Markup Calculator
Convert between margin and markup, and price to hit a target margin.
Profit Margin Calculator
Gross, operating, and net margin plus EBITDA from revenue and costs.
Burn Rate & Runway Calculator
Months of cash left, with revenue growth taken into account.
LTV to CAC Calculator
Acquisition cost, gross-margin lifetime value, ratio, and payback period.
Depreciation Calculator
Schedules by straight line, double declining balance, or sum of years.
Startup Dilution Calculator
Ownership after a priced round, including the pre-money option pool.
SAFE Note Calculator
What a SAFE converts into at a priced round, by cap or by discount.
ROI Calculator
Return on investment, total and annualized.
NPV & IRR Calculator
Net present value and internal rate of return for cash flows.
Break-Even Point Calculator
Units and revenue needed to cover fixed and variable costs.