When trading commodities we calculate their price moves in a measurement called ticks. A tick is therefore the smallest possible price change for any commodity-based instrument and the size of a tick will be unique to each instrument in question.

For example, if an ounce of gold is trading at $1,700.00 and moves to $1,700.01, we say the market moved one tick. If a barrel of crude oil is trading at $90.05 and moves to $90.06, again we say it moved one tick. Therefore for these markets a one tick movement simply refers to a one cent movement in price.

However, other instruments do not move in 1c movements. For example, soft commodities such as wheat, corn and soybeans all move in 25c increments. So let’s say wheat moved from $690.50 per (100) bushel to $690.75 we say it has moved 1 tick.
Read more...https://www.commodity-port.com/blog/index.php/2018/09/10/how-to-calculate-price-moves-when-trading-commodities/