Understand F&O lot sizes and contract specs — Hinglish notes

6.7.3 · Stock-Market › Indian Market Specifics

Core Intuition

Fundamental economic reason: Standardization liquidity create karta hai. Jab sabhi identical contracts trade karte hain, buyers aur sellers turant match ho jaate hain. Custom contracts market ko hazaron micro-markets mein tod denge jahan koi liquidity nahi hogi.

Lot Sizes aur Contract Specifications Kya Hain?

Ye Specs Kyun Exist Karti Hain (First Principles)

Lot size logic ki scratch se derivation:

Contract value target se shuru karo: SEBI chahta hai ki har contract ₹5-10 lakhs notional value represent kare (retail ke liye manageable, institutions ke liye meaningful)
Underlying ki price vary karti hai: Reliance ₹2,500/share pe trade karta hai; Infy ₹1,400/share pe
Lot size solve karo: $Lot Size = \frac{Target Contract Value}{Current Price}$ Reliance ke liye: $\frac{₹7 , 50 , 000}{₹2 , 500} = 300 shares/lot$ Infy ke liye: $\frac{₹7 , 50 , 000}{₹1 , 400} \approx 536 shares/lot$
Clean numbers pe round karo: NSE convenience ke liye 250, 500, 1000, etc. pe round karta hai

Ye step kyun? → Agar lot sizes random hoti (37 shares, 423 shares), toh mental math aur order sizing ek nightmare ban jaati. Round numbers se quick position calculations enable hote hain.

Indian F&O Mein Key Contract Specifications

Real NSE Specifications (as of 2026)

| Underlying | Lot Size | Tick Size | Expiry | Settlement | |----------|----------|--------|------------| | Nifty 50 Index | 25 units | 0.05 points | Last Thursday | Cash | | Bank Nifty | 15 units | 0.05 points | Last Wednesday | Cash | | Reliance | 250 shares | ₹0.05 | Last Thursday | Cash | | TCS | 125 shares | ₹0.05 | Last Thursday | Cash |

Indices ke liye alag expiry days kyun? → Liquidity ko week mein spread karta hai. Prevent karta hai ki saare contracts same day expire karein (settlement chaos).

Step-by-Step Logic ke Saath Worked Examples

Worked example Example 1: Nifty Futures Kharidna

Setup: Nifty 22,450 pe trade kar raha hai. Tumhe 200-point rise ki expect hai. 3 lots kharido.

Step 1: Har lot ki contract value calculate karo $Value/lot = 25 \times 22, 450 = ₹5, 61, 250$ Ye step kyun? → Capital commit karne se pehle apna exposure jaano.

Step 2: Total position value $Total = 3 \times 25 \times 22, 450 = ₹16, 83, 750$ Ye step kyun? → Yahi tumhara notional exposure hai. Agar Nifty 1% move kare, tum iska 1% gain/lose karte ho.

Step 3: Margin required (15% assume karo) $Margin = 0.15 \times 16, 83, 750 = ₹2, 52, 563$ Ye step kyun? → Yahi cash hai jo tumhare account mein actually chahiye.

Step 4: P&L calculation Agar Nifty 200 points rise karke 22,650 ho jaaye: $P&L = 3 lots \times 25 units/lot \times 200 points = ₹15, 000$ Per-point P&L = 3 × 25 = 75 (tum har Nifty point pe ₹75 banate/ganvaate ho)

Common Mistakes aur Steel-manning

Visual Reference

Figure — Understand F&O lot sizes and contract specs

The Feynman Test

Recall Ek 12-saal ke bachche ko samjhao

Socho tum aaj apples kharidne ki jagah "agle mahine apples milne ka vaada" kharidna chahte ho. Lekin market kehti hai tum sirf 1 apple ke liye vaada nahi khareed sakte—bahut chota hai! Tumhe vaade bundles mein kharidne padte hain.

Nifty ke liye (50 badi company shares ki basket), ek bundle = 25 "Nifty points." Reliance shares ke liye, ek bundle = 250 shares. Yahi lot size hai—sabse chota bundle jo tum trade kar sakte ho.

Bundles kyun? Taaki sabhi same-sized boxes mein trade karein. Agar main ek "Reliance vaada" bechun aur tum use kharido, hum dono exactly same cheez ke baare mein baat kar rahe hain (250 shares), na ki tum 17 shares chahte ho aur main 19 bech raha hun. Ye LEGO bricks ki tarah hai—wo isliye click karte hain kyunki standardized hain!

Contract specs instruction manual hain: bundle size, vaade kab expire hote hain, inhe hold karne mein kitna kharch aata hai. Manual follow karo, aur trading smooth ho jaati hai.

Memory Aid

Visual mnemonic: Ek cargo ship (futures contract) ko containers (lot sizes) load karte imagine karo—tum 0.3 containers load nahi kar sakte!

Connections

6.7.01-Futures-vs-Options-basics → Lot sizes dono futures aur options pe apply hote hain
6.7.02-Margin-requirements-and-leverage → Lot size required margin determine karta hai
6.7.05-Rolling-over-futures-positions → Poore lots roll karne padte hain, fractional nahi
6.8.01-NSE-trading-hours-and-settlement → Contract specs mein expiry timing bhi include hai
3.2.04-Position-sizing-and-risk-per-trade → Position size whole lots mein calculate karo

Practical Checklist

Koi bhi F&O trade karne se pehle:

✅ NSE website pe current lot size check karo (quarterly badlata hai)
✅ Contract value calculate karo = lot size × current price
✅ Margin requirement verify karo (SPAN calculator)
✅ Expiry date confirm karo (monthly series = last Thursday)
✅ Limit order pricing ke liye tick size note karo

#flashcards/stock-market

F&O trading mein lot size kya hota hai? :: Underlying units (shares/index points) ki minimum standardized number jo ek derivative contract mein hoti hai. Tum lot ka fraction trade nahi kar sakte.

Derivatives markets mein lot sizes kyun exist karte hain?

Contracts ko standardize karne aur liquidity create karne ke liye. Agar har contract custom hoti, market hazaron illiquid micro-markets mein fragment ho jaati.

Regulators lot size kaise determine karte hain?

Target contract value (₹5-10 lakhs) ÷ underlying ki current price, clean numbers (250, 500, 1000) pe round ki jaati hai.

Nifty lot size 25 hai. Agar Nifty 22,000 pe hai, toh ek contract ki value kya hai?

25 × 22,000 = ₹5,50,000

Agar tum 3 lots Bank Nifty futures (lot size 15) 48,500 pe kharidо, tumhara total notional exposure kya hoga?

3 × 15 × 48,500 = ₹21,82,500

Tick size kya hota hai?

Minimum price increment jis pe ek contract trade ho sakta hai (jaise ₹0.05 most equity F&O ke liye).

Nifty futures kab expire hote hain?

Contract month ke last Thursday ko.

Reliance lot size 250 hai. Tum ₹2,500/share pe ₹10L exposure chahte ho. Kitne lots?

Contract value = 250 × 2,500 = ₹6,25,000 per lot. Chahiye 10,00,000 ÷ 6,25,000 = 1.6 lots → 2 lots pe round karo (0.6 lot trade nahi kar sakte).

Agar lot size 500 se 250 shares ho jaaye, toh same number of shares ke liye tumhari margin requirement ka kya hoga?

Same share quantity ke liye double number of lots trade karne padenge, lekin total margin similar rahega (kyunki total exposure same hai).

Index futures ke liye "cash settlement" ka kya matlab hai?

Expiry pe, tumhare entry price aur settlement price ke beech ka difference cash mein credit/debit hota hai—index ki physical delivery nahi hoti.