Before a premium can be set, the insurer must know how much risk is being transferred. Exposure is the extent to which an insured is subject to potential loss. It is measured in units appropriate to the line of business—payroll, sales, square footage, number of vehicles, or policy limits.

Underwriters evaluate both the quantity of exposure and its quality. A restaurant’s exposure differs from an office’s even at the same square footage. Changes in operations, new locations, or increased limits alter exposure and may require mid-term premium adjustment.

Accurate exposure data at inception and at audit are essential for equitable pricing. Understated exposure leads to inadequate premium; overstated exposure overcharges the insured. Exposure also drives reinsurance decisions and aggregate risk monitoring across a portfolio.

• Measure of the extent of risk transferred
• Expressed in units such as payroll or sales
• Quality as well as quantity matters
• Foundation for premium calculation