F&O Calculator
Calculate closed-trade profit and loss after brokerage and statutory charges.
Calculation methodology reviewed 20 September 2026. Estimates depend on the stated scope and your inputs.
Measure a derivatives trade after its trading costs
A price gain is not the same as a net profit. This F&O calculator models one closed futures or options position, including both entry and exit turnover. Long positions buy first; short positions sell first. Options use the traded premium rather than the underlying index value. Margin is a user-entered capital assumption, not an exchange margin quote.
Worked example
Buying one 75-unit option lot at Rs 100 and selling at Rs 125 gives Rs 1,875.00 gross profit. At Rs 20 brokerage for each of 2 orders and the displayed default April 2026 charge assumptions, total estimated charges are Rs 68.58 and net profit is Rs 1,806.42. Changing the lot size changes both turnover and profit.
Formula and calculation method
Quantity = lot size x lots; gross P&L = sell turnover - buy turnover; net P&L = gross P&L - trading chargesBrokerage is entered per executed order. Exchange and SEBI fees use both-side turnover, stamp duty uses buy turnover, and STT uses sell turnover. GST applies to brokerage, exchange and SEBI fees. From April 2026, the modeled sell-side STT is 0.05% for futures and 0.15% for option premiums; the earlier period uses 0.02% and 0.10%. The current NSE presets use 0.00183% for equity futures and 0.03553% on equity-option premium turnover. The break-even solver includes the way charges vary with exit price.
Interpretation and limitations
This is a closed-trade estimator, not an options pricing model or strategy payoff builder. It does not simulate the underlying asset, Greeks or expiry exercise. Physically settled contracts, exercise STT, broker-specific minimum fees and contract-note rounding can change actual costs. Defaults are editable NSE fee assumptions; use your broker contract note. Negative net P&L and losses beyond margin are possible.
Reference: NSE: securities transaction tax and effective dates.
F&O Calculator: Frequently Asked Questions
Is the displayed F&O turnover the turnover used for tax audit?
No. Here, turnover means transaction value used to calculate trading charges. Tax-audit turnover for derivatives follows separate rules and must not be inferred by adding this calculator's buy and sell turnover.
What does this futures and options calculator estimate?
It calculates gross and net profit for one opened and closed equity-derivatives position from traded prices, lot size, number of lots and charges. It does not value a multi-leg options strategy or quote live exchange margin.
How is F&O profit calculated from lots?
Quantity is lot size multiplied by the number of lots. Gross profit is sell turnover minus buy turnover, and net profit subtracts modeled charges. For a short position, the opening transaction is the sale.
Should I enter the option premium or the index level?
For an options trade, enter the traded premium per unit at entry and exit, not the underlying index level or strike price. The calculator does not derive an option premium from the underlying price.
Why is net profit less than the price difference multiplied by quantity?
The price-difference calculation is gross profit. Brokerage, exchange charges, STT, stamp duty, SEBI fees and applicable GST reduce the net result. Even a trade closed at the entry price can lose money after costs.
More questions (7)
Does this calculate option expiry payoff or Greeks?
No. It estimates a closed trade using the entered premium or futures price. Expiry exercise, physical settlement, implied volatility, delta and other Greeks require separate models and charge treatment.
Is F&O margin the same as the maximum possible loss?
No. Entered margin or capital is only used as a comparison base for the modeled return. It is not a loss limit. Futures and short-option losses can exceed the margin provided.
Does this include income tax on trading profits?
No. The charge estimate is separate from income tax, loss adjustments and return-filing requirements. Tax treatment depends on the individual's circumstances and applicable law, not only the profit from one trade.
Can this calculate a short option trade?
Yes. Choose sell first / short, enter the opening premium and closing premium, and supply the margin or capital used. The model reverses the buy and sell turnover correctly.
Why must I enter the lot size?
Lot sizes vary by contract and can change over time. A manually entered size avoids presenting an outdated symbol preset as a current contract specification.
Does the scenario chart show expiry payoff?
No. It varies the closing futures price or option premium. An option premium before expiry depends on more than the underlying price; this tool does not infer that premium.
Can I use it for a trade spanning the STT change?
The selected rates apply to both executions. Trades across the effective-date boundary, especially shorts, require separately dated charge calculations and are outside this model.