Investment Labs

Free financial modeling tools. Monte Carlo simulation, portfolio backtesting, stock growth analysis, FIRE planning, and more. No signup required.

What-if scenarios for any stock, ETF, or index. Multi-ticker comparison, CSV upload, shareable results.

Backtest custom portfolios with allocations, rebalancing, contributions, and leverage simulation.

Percentile fan charts from 1000+ simulations. Parametric or historical bootstrap from real market data.

Compare leveraged lifecycle investing vs traditional strategies. Monte Carlo with 138 years of historical data.

Compound growth with contributions, inflation adjustment, compounding frequency, and step-up rates.

Financial independence number, timeline, savings rate, and return sensitivity analysis.

Coast number across return rates and retirement ages. Sensitivity matrix for planning.

Required monthly savings or time to goal. Inflation-adjusted targets with what-if scenarios.

Expense ratio and advisory fee drag over time. Side-by-side comparison of up to 3 fee tiers.

Nominal vs inflation-adjusted returns using the Fisher equation. Purchasing power over time.

Avalanche vs snowball strategy comparison. Interest savings and payoff timeline.

Doubling time estimation. Rule of 72 vs exact calculation across rates.