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Loan Calculator

Quick calculator for monthly payments, total interest, and amortization schedules.

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Advanced Loan Calculator

Track existing loans, add extra payments, compare payoff strategies, and see how much you can save.

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PV Calculator

Find the present value of a future sum based on a discount rate.

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NPV & IRR Calculator

Analyze investments with net present value, internal rate of return, sensitivity analysis, and side-by-side comparison.

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Investment Projections

Project portfolio growth across multiple scenarios with S&P 500 benchmarking and milestone tracking.

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Options Strategy Lab

Visualize payoff diagrams, calculate Black-Scholes pricing, explore the Greeks, and learn 40+ options strategies.

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Stock Evaluator

Multi-method fundamental analysis using DCF, Graham Number, liquidation value, market multiples, enterprise value, and more.

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10-K Analyzer

Pull SEC filings and get consolidated financial summaries with automated health scoring and red flag detection.

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FIRE Dashboard

Calculate your Financial Independence number, track progress, and find your Coast FIRE target.

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Contribution Margin Analysis

Analyze contribution margin vs gross profit, breakeven analysis, multi-product mix, capacity constraints, and operating leverage.

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Cost Structure & Allocation

Compare fixed vs variable cost structures, allocate overhead (death spiral demo), classify costs, and avoid the unit cost trap.

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Supply & Demand

Define linear supply and demand curves by equation or two points, solve for market equilibrium with step-by-step algebra, and explore curve shifts interactively.

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Consumer Theory

Price elasticity, cross-price effects, expected utility, and risk premium — interactive tools for economics.