Get strike which is x% lower the Spot

Assuming Nifty Spot is 20567 , I need to get the strike price which is 1% lower than current spot and 1% higher that current spot. In this example 20567 - 0.01 * 20567 = 20361 which would be strike of 20400. How to build this rule ?

first do math operation and then use round keyword to get the strike of 20400.

Multiply the spot by 0.99 (or 1.01) with Math Operation, then snap it to a strike with Round.

Strike Fx

• 1% below spot: Round ( Math Operation ( LTP ( NIFTY 50 ), Number ( 0.99 ), '*' ), 100 )
• 1% above spot: the same with Number ( 1.01 ).

Picking the Round base

Round snaps to the nearest multiple of the base you give:

• Spot 20567 × 0.99 = 20361.3.
• Base 100 → 20400 (your example).
• Base 50 → 20350.

Use base 100 if you want only round-hundred strikes, or your index’s strike interval for the closest listed strike. Check the interval on the option chain.

Put the formula in the leg’s Strike Fx, pick the expiry and CE/PE as usual, and test in Live Offline to confirm the strike in the Notification Log. Keyword reference: Keyword Documentation — Tradetron

Answer written with AI from Tradetron docs (Oct 2026). Original replies are kept above. Spot something wrong? Reply below.