Free quant finance calculators, backed by a real API.
Black-Scholes, Kelly, VaR, crypto liquidation, and more — calculated by the same deterministic engine that prices options for autonomous AI agents. No signup, no API key.
Calculators
10 live, 1 coming soon.
Black-Scholes Option Pricing Calculator
Price European calls and puts with full Greeks (delta, gamma, vega, theta, rho).
American Option Pricing Calculator (Binomial Tree)
Price American calls and puts with early exercise and dividend yield via a binomial tree.
Options Profit Calculator
Visualize the payoff diagram and break-even points for any option strategy.
Crypto Liquidation Price Calculator
Calculate the liquidation price for leveraged long and short positions.
Impermanent Loss Calculator
Estimate impermanent loss for liquidity-pool positions across price moves.
Position Size Calculator
Size positions consistently using account size, risk-per-trade, entry, and stop-loss.
Value at Risk (VaR) Calculator
Compute parametric VaR and CVaR for a return series at any confidence level.
Kelly Criterion Calculator
Find the optimal bet/position size given win rate and average win/loss.
Implied Volatility Calculator
Solve for the implied volatility of an option given its market price.
Sharpe Ratio Calculator
Compute the Sharpe ratio of a returns series with a configurable risk-free rate.
Hedge Calculator
Get ranked hedge structures (collar, protective put, partial put) for a position.
Why these calculators?
Every quant finance tool on the open web is either: (a) an ad-cluttered relic of 2007 with a form that takes 10 seconds to render, or (b) trapped behind a $99/mo paywall on a Bloomberg terminal. We built a fast, free alternative — and we mean fast: every calculator returns in under 70 ms because the math runs on the same 73-endpoint deterministic API we built for AI agents.
You don't need to know what x402 micropayments or A2A AgentCards are to use these calculators. They're free for humans, full stop. If you're a developer and want to embed any of this math in your own app, the API docs are a click away — first 1,000 calls/IP/day are free, no signup.