Crude Oil options on MCX behave differently from equity options because the underlying is a commodity future and the lot size is fixed at 100 barrels. To understand why an option premium moves, you need to know the Option Greeks. These are the sensitivity measures that explain how an option will react to price, time and volatility changes.
Here I will explain Delta, Gamma, Theta, Vega and Rho using practical examples based on Crude Oil options.
Delta
Delta shows how much the option premium is expected to change if Crude Oil futures move by 1 rupee per barrel.
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Call options have positive delta
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Put options have negative delta
Example:
You buy a Crude Oil call option with a delta of 0.40.
If the futures price increases by 10 rupees per barrel, the option premium may increase by 4 rupees per barrel.
Since the lot size is 100 barrels, the total change in premium is 4 × 100 = 400 rupees.
Delta also loosely reflects the probability of the option expiring in the money. A delta of 0.50 suggests roughly a fifty percent chance of finishing ITM.
Gamma
Gamma tells you how quickly delta will change when the underlying price moves.
ATM options have the highest gamma.
Deep ITM and far OTM options have lower gamma.
Example:
Your Crude Oil call option has a gamma of 0.02.
If the underlying rises by 5 rupees, delta may increase by 0.10.
If delta was earlier 0.40, it becomes 0.50 after the move.
This means the option becomes more sensitive to further price moves.
For option sellers, high gamma is risky because delta can change quickly during sharp movements in crude.
Theta
Theta shows how much value an option loses every day due to the passage of time.
Long options have negative theta.
Short options have positive theta.
Example:
A Crude Oil call option has a theta of minus 0.15 per barrel per day.
This means the option loses 0.15 rupees per barrel per day purely as time decay.
For 100 barrels, that is a loss of 15 rupees per day from time decay alone.
Time decay speeds up as expiry approaches.
Vega
Vega shows how much the option price changes if implied volatility moves by 1 percent.
Example:
A Crude Oil call option has a vega of 0.10 per barrel.
If IV increases by 1 percent, premium increases by 0.10 rupees per barrel.
For 100 barrels, the total gain is 10 rupees.
Commodity options like Crude Oil are heavily impacted by news events, inventory data and global supply signals, which can cause volatility spikes.
Rho
Rho measures the sensitivity of the option price to interest rate changes.
It is usually small for short-dated Crude Oil options, so traders often ignore it.
Combined Example
Underlying: Crude Oil futures at 7,500 rupees per barrel
Option selected: Crude Oil 7,600 CE
Lot size: 100 barrels
Expiry: 10 days
Premium: 70 rupees per barrel (total 7,000 rupees)
Greeks of this option:
Delta 0.45
Gamma 0.015
Theta minus 0.12
Vega 0.08
One day later, assume the following happens:
Crude futures rise by 20 rupees
IV increases by 1 percent
One day of time passes
Impact on premium:
Delta impact: 20 × 0.45 = 9 rupees
Vega impact: 0.08 rupees
Theta decay: minus 0.12 rupees
Approx change per barrel: 9 + 0.08 − 0.12 = 8.96 rupees
Total change for 1 lot: 8.96 × 100 = 896 rupees
Premium increases from 7,000 to around 7,896 rupees.
This example shows how multiple Greeks combine to influence the daily change in premium.
Practical Tips for Crude Oil Option Traders
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Monitor delta and gamma when scalping. These determine responsiveness to price moves.
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Manage theta if you hold long options overnight.
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Track implied volatility during events like weekly inventory data.
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Avoid illiquid strikes in commodity options.
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Always consider lot size. A small change in price per barrel becomes large in rupee terms.
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For option sellers, be cautious around high gamma zones near expiry.
Conclusion
Understanding Greeks gives you clarity on why Crude Oil option premiums behave the way they do. With a fixed lot size of 100 barrels, even small moves in delta or volatility create meaningful changes in PnL. Whether you trade manually or through algos, Greeks help in decision-making, risk control and choosing the right strike.