Free · no sign-up · formulas explained
Financial calculators
Calculators for investors, traders, borrowers and business owners. Every tool shows its formula, a worked example and a chart, and every formula is tested against known answers before it goes live.
- 6calculators live
- 6groups
- 400tools planned
- 100%free
- Stock Market & Equity
Profit, return, CAGR, volatility, beta and drawdowns for the stocks you hold or plan to buy.
1 calculator - Stock Valuation & Fundamentals
P/E, PEG, DCF, the Graham Number and the ratios analysts use to judge what a share is worth.
1 calculator - Dividends & Income
Yield, income, payout safety, reinvestment and the snowball toward living on dividends.
Coming soon - Trading & Risk Management
Position size, stops, risk-reward, expectancy, Kelly and the maths of surviving losing streaks.
Coming soon - Forex Trading
Pip value, lot size, margin, swaps and session times for currency traders.
1 calculator - Portfolio Management & Performance
Sharpe, Sortino, drawdown, correlation, rebalancing and portfolio optimization.
1 calculator - Options, Futures & Derivatives
Black-Scholes, Greeks, implied volatility and payoff diagrams for common option strategies.
Coming soon - Crypto & Digital Assets
Profit, DCA, liquidation price, funding, staking, mining and impermanent loss.
Coming soon - Bonds & Fixed Income
Yield to maturity, bond prices, duration, convexity, T-bills and bond ladders.
Coming soon - Savings & Compound Interest
Compound interest, APY, savings goals, CDs and how long money lasts.
1 calculator - Budgeting, Salary & Household
Budgets, net worth, debt-to-income, take-home pay and hourly rates.
Coming soon - Loans, Mortgages & Debt
Mortgage and loan payments, amortization, refinancing and debt payoff plans.
1 calculator - Real Estate Investing
Rental cash flow, cap rate, rental yield, IRR, rent vs buy and flipping.
Coming soon - Retirement & FIRE
Retirement savings, withdrawals, FIRE numbers, 401(k), IRA and Monte Carlo odds.
Coming soon - Business Profitability & Operations
Margins, break-even, EBITDA, pricing, working capital and runway.
Coming soon - Corporate Finance & Capital Investment
NPV, IRR, WACC, CAPM, terminal value, startup valuation and dilution.
Coming soon - SaaS, E-commerce & Marketing
CAC, LTV, churn, MRR, ROAS and the unit economics of online businesses.
Coming soon - Taxes, Inflation & Currency
Capital gains, income and sales tax, inflation, real returns and currency conversion.
Coming soon - Quant & Algorithmic Trading
Monte Carlo, deflated Sharpe, overfitting, walk-forward, capacity and execution costs.
Coming soon - Advanced Risk & Institutional
VaR attribution, hedging, market-neutral books, pairs trading and factor exposure.
Coming soon
No calculator matches that search yet.
Stock Market & Equity
See the group →Stock Valuation & Fundamentals
See the group →Forex Trading
See the group →Portfolio Management & Performance
See the group →Savings & Compound Interest
See the group →Loans, Mortgages & Debt
See the group →How these calculators work
Each calculator runs entirely in your browser: nothing you type is sent to a server or stored. The page loads with a worked example already filled in, so you can see what every result means before entering your own numbers, and the Copy link button saves your inputs in a link you can bookmark or share.
Every formula is written once and used three ways: to calculate the results you see, to produce the worked example in the article below each calculator, and to run an automatic test against known answers each time the site is published. If a test fails, the update is not published.
The tools are grouped by topic, from compound interest and mortgages to options pricing and backtest overfitting. Each page explains the formula, how to read the result and, just as important, what the number does not tell you. Results are estimates based on your inputs and are not financial, tax or legal advice.