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Does your trading idea survive the charges?

Check the costs first. Then test your own written rules against historical data.

A REPRODUCIBLE EXAMPLE · NOT AN ACTUAL TRADE

A ₹65 gross gain. A ₹0.81 net loss.

Buy an option at ₹120, sell at ₹121, quantity 65. With the library’s NSE Zerodha rate model, estimated round-trip charges are ₹65.81.

Gross P&L: +₹65.00
Estimated charges: ₹65.81
Net P&L: −₹0.81

Model rates effective 1 April 2026. Excludes slippage and option exercise; quantity is illustrative. Your broker’s contract note is the final check.

Check your own trade Reproduce the calculation in Python

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Trading charges calculator

Explore a round trip and compare what remains after costs.

Options profit calculator

Breakeven, max profit and loss, and charges for a call or put.

Position size calculator

Shares to buy from your capital, risk and stop-loss.

Stock average calculator

Your average buy price, and what the next buy does to it.

India crypto tax calculator

Keep profitable transfers, losses and TDS credit separate.

Learn how to read the evidence

Backtesting Indian stocks

Three written-rule examples and a checklist for reading results.

Paper trading in India

Build a practice process with virtual money.

Watch the workflow

Follow the research process and inspect the assumptions.

Daily market wrap

Breadth, movers and sectors across NSE large caps after each close.

Watch the product video

Bring your own written rule.

Use AI-assisted research, historical testing and a virtual portfolio. Start with a 7-day trial.

Backtest an idea, 7 days free

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Have feedback on the research workflow? Join the existing public discussions on r/IndiaAlgoTrading or r/Indiantradingbets.