Free Day Trading Tools

Professional-grade calculators for position sizing, risk management, and trade analysis. All tools run locally in your browser — no data is sent to our servers.

Educational Tools Only. These calculators are for educational and informational purposes only and do not constitute financial or trading advice. Results are mathematical computations that do not account for fees, commissions, slippage, taxes, or real market conditions. Always consult a licensed financial advisor before making trading decisions. Day trading involves substantial risk of loss.

Position Size Calculator

Calculate the optimal number of shares based on your risk tolerance

Account Size ($)

Risk Per Trade (%)

Entry Price ($)

Stop Loss ($)

Risk/Reward Calculator

Evaluate if a trade setup is worth taking based on R:R ratio

Entry Price ($)

Stop Loss ($)

Take Profit ($)

Profit/Loss Calculator

Calculate P&L for any trade including long and short positions

Entry Price ($)

Exit Price ($)

Shares / Contracts

Direction

Margin Calculator

Calculate margin required for leveraged positions

Units / Shares

Price Per Unit ($)

Leverage (e.g. 4)

Compound Growth Calculator

See how daily returns compound over time (educational illustration)

Starting Capital ($)

Daily Return (%)

Trading Days

Day Trading Tax Estimator

Estimate federal taxes on short-term capital gains (educational only)

Trading Profit ($)

Other Income ($)

Filing Status

Want the MIT Triple Stack Working for You?

The Heater uses the same math that made MIT students millions — Expected Value, Kelly Criterion, and Monte Carlo simulation — applied to every bet you make.