Nifty Lot Size Explained: Nifty, Bank Nifty, FINNIFTY & Midcap Nifty Lot Sizes
The current Nifty lot size is 65 units (effective from the January 2026 expiry series). Every Nifty futures and options contract represents 65 units of the index.
Since NSE revises lot sizes periodically, it's important to use the latest value before placing a trade or backtesting a strategy.
In this guide, you'll find the latest Nifty, Bank Nifty, FINNIFTY, and Midcap Nifty lot sizes, learn why NSE changes them, and understand how they affect margin, risk, and contract value
What Is Nifty Lot Size?
Nifty lot size is the fixed number of units in one Nifty futures or options contract.
Unlike stocks, index derivatives can't be traded one unit at a time. Instead, NSE defines a fixed lot size for every contract. The current Nifty lot size is 65 units, so every futures or options trade must be placed in multiples of 65.
Latest NSE Lot Sizes (2026)
Here's where things stand right now, based on NSE's most recent revision:
The current Nifty lot size is 65, while Bank Nifty, FINNIFTY, and Midcap Nifty have different lot sizes based on their contract values.
NSE reviews these numbers periodically, roughly every six months, under a SEBI-mandated framework. Don't treat these as permanent.
Always confirm the lot size on your trading terminal before placing an order. A mental note from even a year ago can already be outdated.
Related: Nifty Expiry Day Explained
Why Does NSE Change Lot Sizes?
NSE revises lot sizes to keep the value of index derivatives within SEBI's prescribed contract value range. As index prices rise or fall, lot sizes are adjusted so contracts don't become too expensive or too small.
That's why Nifty, Bank Nifty, FINNIFTY, and Midcap Nifty all have different lot sizes.
How Lot Size Affects Your Trading
Your lot size affects much more than just the number of units you trade. It directly impacts:
Margin requirement: A larger lot size usually requires more margin to open a position.
Profit and loss: Every point the option premium moves is multiplied by the lot size.
Position sizing: A change in lot size changes your overall market exposure, even if you trade just one lot.
Capital required: If you trade with a fixed budget, a lot size revision can increase or reduce the capital needed for a single trade.
When comparing indices, don't look at the lot size alone. A 120-unit Midcap Nifty lot and a 30-unit Bank Nifty lot represent very different contract values because the underlying indices trade at different price levels.
Example
Suppose you sell 1 lot of Bank Nifty options at a premium of ₹150. Since the current Bank Nifty lot size is 30 units, the premium you receive is:
₹150 × 30 = ₹4,500
Now, if the option premium increases by ₹50, your loss becomes:
₹50 × 30 = ₹1,500
This is one of the most common mistakes new traders make. They calculate profit or loss based on the premium per unit and forget that every point is multiplied by the entire lot size.
How to Calculate Nifty Contract Value
The formula is simple:
Contract Value = Index Price × Lot Size
For example, if Nifty 50 is trading at 24,500 and the lot size is 65, the contract value is:
24,500 × 65 = ₹15,92,500
This is the notional value of one contract, not the amount you pay upfront.
Options buyers pay only the option premium for 65 units.
Futures traders and options sellers need to maintain margin, which is typically 10–15% of the contract value, depending on market volatility and your broker.
For a contract worth around ₹16 lakh, the required margin could range from ₹1.6 lakh to ₹2.4 lakh. Instead of estimating, you can use the AlgoTest Margin Calculator to check the latest margin requirements before placing a trade.
Nifty Futures vs Nifty Options Lot Size
Nifty futures and Nifty options have the same lot size. If the current Nifty lot size is 65, every futures and options contract represents 65 units of the index.
The difference isn't the lot size—it's the capital required to trade.
Options buyers pay only the option premium.
Futures traders and options sellers need to maintain margin, which is significantly higher.
Although both contracts have the same lot size, futures and short options generally require much more capital than buying an option.
Nifty Lot Size History
Lot sizes aren't fixed forever. Here's how they've moved for the major indices over the last two years:
The pattern is clear: lot sizes aren't a one-way street. They go up when an index price falls or a regulatory floor is introduced.
They come down when the index price climbs and NSE wants to keep contract values from getting too large. Expect this cycle to continue roughly twice a year.
Related: Nifty Midcap 150: Complete Stocks List, Weightage, and Trading Guide (2026)
Common Mistakes Traders Make
When trading Nifty futures or options, avoid these common mistakes:
Confusing 1 lot with 1 unit, leading to incorrect risk and capital calculations.
Ignoring the contract value and focusing only on the option premium.
Calculating profit or loss per unit instead of multiplying by the lot size.
Using outdated lot sizes, as NSE revises them periodically.
Assuming all indices have the same lot size, even though Nifty, Bank Nifty, FINNIFTY, and Midcap Nifty each have their own contract specifications.
Why Lot Size Matters When Backtesting Strategies
Accurate backtesting depends on using the correct lot size. If your platform uses outdated contract specifications, your margin requirements, position sizing, and profit or loss calculations can be inaccurate.
A strategy that looks profitable with an old lot size may require much more capital when traded in the live market.
Platforms like AlgoTestautomatically use updated contract specifications for Nifty, Bank Nifty, FINNIFTY, and Midcap Nifty. This helps ensure your backtests, margin estimates, and position sizing reflect current market conditions before you deploy a strategy live.
Trade With the Right Numbers, Every Time
The Nifty lot size affects every futures and options trade you place, from margin and position sizing to profit and loss. Since NSE revises lot sizes periodically, it's a good habit to verify the latest values before entering a trade or running a backtest.
If you're testing or building options strategies, make sure you're using updated contract specifications. AlgoTest helps you backtest, paper trade, and simulate strategies using the latest lot sizes so your results stay as close to real market conditions as possible.
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