Free online tools

Straightforward calculators for options, bonds, and mortgages

Price vanilla and exotic options, check bond duration and YTM, estimate Value at Risk, or work out a monthly mortgage payment. No account required.

Mortgage calculator Option pricing

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Most used calculators

Mortgage

Monthly payment, total cost, and interest from principal, rate, and term — with the amortization formula, examples, and a payment FAQ.

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Vanilla / binary options

Black-Scholes prices and Greeks for European calls and puts.

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Bond pricing

Dirty and clean price, YTM, Macaulay and modified duration.

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Value at Risk

Estimate theoretical maximum loss at a chosen confidence level.

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Option pricing

Models and Monte-Carlo tools

Vanilla / binary

European calls and puts, including cash-or-nothing binaries and Greeks.

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FX options

Garman-Kohlhagen pricing for FX calls and puts with sensitivities.

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Implied volatility

Back out Black-Scholes implied vol from an observed option price.

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Asian options

Monte-Carlo pricing for fixed- and floating-strike Asian options.

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Lookback options

Monte-Carlo lookback pricing with in-the-money statistics.

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Option strategies

Payoff charts and what-if P&L

Long call / put

Limited downside, charted payoff at expiry, and live P&L sliders.

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Short call / put

Short option payoff with implied-vol and spot simulations.

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Call / put spread

Bull and bear spreads with defined risk on both sides.

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Straddle

Long or short straddle payoff around a single strike.

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Strangle

Two-strike volatility strategy with charted expiry payoff.

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Butterfly

Three-strike butterfly P&L with range and vol controls.

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Iron condor

Four-leg condor payoff and pre-expiry P&L simulation.

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Bonds and risk

Rates, duration, and volatility

Standard bonds

Coupon bonds with accrued interest, YTM, and duration.

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Zero-coupon bonds

Discounted price, YTM, and duration for zeros.

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Value at Risk

Normal-distribution VaR from position size and volatility.

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Volatility converter

Translate daily, weekly, monthly, or annual volatility figures.

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Figures are theoretical and for education only. They do not constitute investment advice.