Free tools
Trading calculators, free and honest
Every tool runs in your browser, states its assumptions on the page, and links the source of every rate it uses. Brokerage calculators cover all seven brokers INDfolio AI deploys to; the maths tools are the ones systematic traders actually reach for.
These calculators are free, run entirely in your browser, and store nothing. They produce estimates for NSE trades based on published rates and standard formulas — not investment advice, and not a substitute for your broker’s contract note. INDfolio AI builds algo trading software; the honest connection is that our backtests apply this same cost arithmetic to every simulated trade.
Brokerage & charges
Brokerage calculator — the real cost of a trade on NSE
The full cost of an NSE trade — brokerage, STT, exchange charges, GST, stamp duty and DP — across Zerodha, Fyers, Dhan, Angel One, Upstox and more. Free.
Updated September 2026 Open calculator →Zerodha brokerage calculator — full charges on an NSE trade
Zerodha charges on NSE trades, itemised: ₹0 delivery brokerage, ₹20-capped intraday and F&O orders, plus STT, exchange charges, GST, stamp duty and DP.
Updated September 2026 Open calculator →Fyers brokerage calculator — full charges on an NSE trade
Calculate Fyers charges on NSE trades: ₹20-capped orders across segments, plus STT, exchange transaction charges, GST, stamp duty and DP charges. Free tool.
Updated September 2026 Open calculator →Dhan brokerage calculator — full charges on an NSE trade
Dhan charges on NSE trades, itemised: ₹0 delivery brokerage, ₹20-capped intraday, flat ₹20 F&O orders, plus STT, exchange charges, GST, stamp duty and DP.
Updated September 2026 Open calculator →Angel One brokerage calculator — full charges on an NSE trade
Angel One charges on NSE trades, itemised: 0.1%/₹20-capped equity orders (min ₹5), flat ₹20 F&O, plus STT, exchange charges, GST, stamp duty and DP.
Updated September 2026 Open calculator →Upstox brokerage calculator — full charges on an NSE trade
Upstox charges on NSE trades, itemised: ₹20 delivery orders, 0.1%/₹20 intraday, 0.05%/₹20 futures, flat ₹20 options, plus STT, exchange charges and GST.
Updated September 2026 Open calculator →Alice Blue brokerage calculator — full charges on an NSE trade
Alice Blue charges on NSE trades, itemised: ₹20-capped orders with 0.05% F&O rates, plus STT, exchange transaction charges, GST, stamp duty and DP.
Updated September 2026 Open calculator →Shoonya brokerage calculator — full charges on an NSE trade
Shoonya (Finvasia) charges on NSE trades: ₹0 delivery, ₹5-capped intraday and F&O orders, plus STT, exchange charges, GST, stamp duty and DP charges.
Updated September 2026 Open calculator →Options tools
Black-Scholes calculator — option fair value and Greeks
Price NIFTY, Bank NIFTY and stock options with the Black-Scholes model: fair value, Delta, Gamma, Theta, Vega and Rho from spot, strike, expiry and IV. Free.
Updated September 2026 Open calculator →Option payoff calculator — chart any strategy’s profit and loss
Build option strategies leg by leg — straddles, strangles, spreads, iron condors — and see the expiry payoff chart, max profit, max loss and breakevens. Free.
Updated September 2026 Open calculator →Trading & risk
Position size calculator — how much to trade, from risk backwards
Size trades by risk, not feel: enter capital, risk %, entry and stop-loss to get the exact quantity to trade. The discipline behind accounts that last.
Updated September 2026 Open calculator →Risk-reward ratio calculator — and the win rate your setup demands
Enter entry, stop-loss and target to get your risk-reward ratio and the minimum win rate a setup needs to be profitable. Free, instant, no signup.
Updated September 2026 Open calculator →CAGR calculator — the annualised truth about a return
Calculate compound annual growth rate from starting value, ending value and years. Compare trading strategies, stocks and funds on the one honest yardstick.
Updated September 2026 Open calculator →Compounding calculator — what a return rate turns capital into
Project how trading capital grows at a given annual return, with optional monthly additions — and what the projection can’t promise. Free, no signup.
Updated September 2026 Open calculator →Kelly criterion calculator — the mathematically optimal bet size
Compute the Kelly fraction from win rate and win/loss sizes — the bet size that maximises long-run growth — and why traders should use half of it or less.
Updated September 2026 Open calculator →Sharpe ratio calculator — return per unit of risk
Compute the Sharpe ratio from annual return, risk-free rate and volatility — the standard measure of return per unit of risk for strategies and portfolios.
Updated September 2026 Open calculator →Drawdown recovery calculator — what it takes to get back to even
See the gain required to recover any loss: −10% needs +11.1%, −50% needs +100%. The asymmetry that makes capital protection the first rule of trading.
Updated September 2026 Open calculator →Why these tools are free
INDfolio AI’s product is an algo trading platform whose backtests deduct the full Indian cost stack — the same brokerage, STT, exchange charges, GST and stamp duty these calculators itemise — from every simulated trade. Publishing the arithmetic openly is the cheapest honesty we know: if the numbers here surprise you, your backtests elsewhere have been lying to you.
From one calculation to a tested strategy.
Describe your trading idea in plain English — INDfolio AI builds it, backtests it on NSE data with these exact costs, and paper trades it free.