To calculate a business's break-even point, one needs the gross margin percentage, total overhead costs, and total balance sheet payments. The break-even point is the amount of sales needed to generate a profit of zero and is calculated by taking the sum of overhead expenses and balance sheet payments and dividing it by the gross margin percentage. For a business with an 89% gross margin, $25,000 in overhead costs, and $7,000 in balance sheet payments, its break-even point would be $35,955 in sales.