Calculators
Loan Calculator
Quick calculator for monthly payments, total interest, and amortization schedules.
Advanced Loan Calculator
Track existing loans, add extra payments, compare payoff strategies, and see how much you can save.
PV Calculator
Find the present value of a future sum based on a discount rate.
NPV & IRR Calculator
Analyze investments with net present value, internal rate of return, sensitivity analysis, and side-by-side comparison.
Investment Projections
Project portfolio growth across multiple scenarios with S&P 500 benchmarking and milestone tracking.
Trading Tools
Research Tools
Retirement Planning
Managerial Accounting
Contribution Margin Analysis
Analyze contribution margin vs gross profit, breakeven analysis, multi-product mix, capacity constraints, and operating leverage.
Cost Structure & Allocation
Compare fixed vs variable cost structures, allocate overhead (death spiral demo), classify costs, and avoid the unit cost trap.
Economics
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.
Consumer Theory
Price elasticity, cross-price effects, expected utility, and risk premium — interactive tools for economics.