We built ReturnMechanics to solve a single problem: human brains are wired for linear stories, but financial markets operate on stochastic probabilities.
Instead of compounding wealth at a flat 7% a year—which never happens in reality—our engine uses normal distributions to map out thousands of parallel universes. By applying localized volatility to each time step, we reveal the "cone of uncertainty" so you can prepare for the 10th percentile bear markets, not just the median.
In our Portfolio Lab, we don't just add asset returns together. We use institutional quant formulas to calculate the covariance matrix between asset classes, plotting exactly how diversification shifts your risk-adjusted efficient frontier.
Our Decumulation engine models the deadliest risk in retirement: market crashes occurring simultaneously with capital withdrawals. It calculates your exact probability of outliving your wealth under extreme market stress.
Test your intuition. Make a prediction and see how it holds up against 200 parallel market simulations.
Build a multi-asset portfolio and visualize the blended volatility and efficient frontier.
Track your psychological calibration over time. Are you consistently overconfident?
Subject your portfolio to the 2008 Financial Crisis or the 2000 Dot-Com crash.
A gamified flight simulator. Can you hold your nerve during a month-by-month market crash?
Test your retirement withdrawal rate against sequence of return risk.
The financial industry has a transparency problem. Retail investors are handed simple calculators that draw straight lines going up, while institutions use supercomputers to map risk.
ReturnMechanics was built to bridge that gap. I wanted to create a platform that doesn't just give you a number, but actually trains your financial intuition. It acts as a flight simulator for your wealth—letting you experience the emotional weight of market crashes and the mathematical reality of compound interest before you ever risk a real dollar.
RM combines institutional-grade quantitative mathematics with behavioral psychology to help you answer one question: Are your expectations aligned with reality?
Welcome to the lab. Go break some models.