There are so many online Economic Order Quantity (EOQ) calculators you can use to calculate EOQ for your company. They include Zoho Inventory EOQ Calculator, QuickBooks EOQ Calculator, and Omni Calculator. Omni Calculator is the best EOQ formula calculator. The EOQ formula calculator allows you to input your yearly demand, order cost, and yearly cost of holding which it uses to determine your Economic Order Quantity (EOQ).  In situations where the EOQ is not a whole number, it predicts the number of units you should order to minimize your holding and order costs.