Free trading tools
Built because we needed them to be correct internally. No account, no email, no upsell in the way of the answer.
NSE F&O Lot Size — Current and Full Revision History
Lot size for any NIFTY, BANKNIFTY, FINNIFTY, MIDCPNIFTY or SENSEX contract — keyed on expiry, not on the date you look it up.
Options Position Size Calculator
Lots from your risk budget and stop distance — ATR-aware, delta-adjusted, and capped at the premium an option buyer can actually lose.
Option Premium Calculator (Black-Scholes)
Theoretical premium, delta and per-day theta for any NSE strike — the same Black-Scholes implementation the engine prices chains with.
Looking for a definition instead?
The glossary covers 36 terms — order blocks, BOS vs CHoCH, IV rank, max pain, theta and the rest — with what each means and where traders usually get it wrong.
Educational and analytical content only. OptionLab Pro is not a SEBI-registered investment adviser or research analyst and does not give buy or sell recommendations. Derivatives trading carries a high risk of loss.