Premium to Surplus Ratio is the ratio that measures the ability of the insurer to absorb above-average losses and the insurer's financial strength. The ratio is computed by dividing net premiums written by surplus. An insurance company's surplus is the amount by which assets exceed liabilities. The ratio is computed by dividing net premiums written by surplus. For example, a company with $2 in net premiums written for every $1 of surplus has a 2-to-1 premium to surplus ratio. The lower the ratio, the greater the company's financial strength. State regulators have established a premium-to-surplus ratio of no higher than 3-to-1 as a guideline.