Loss Ratio Calculator

Loss & LAE Ratio = ((Incurred Losses + Loss Adjustment Expenses) / Earned Premiums) x 100 — this bundles claims-handling expenses (LAE) together with the losses themselves, following the NAIC/A.M. Best convention. The NAIC's own Glossary of Insurance Terms defines Loss Ratio as "the percentage of incurred losses to earned premiums"; this calculator's Loss & LAE Ratio extends that base definition by folding LAE into the numerator, one of two conventions seen in practice. It measures what percentage of every premium dollar collected is being paid back out in claims and the cost of settling them, before underwriting expenses.

Combined Ratio is Loss & LAE Ratio plus Expense Ratio. A combined ratio above 100% means the insurer's claims payouts, claims-handling costs, and operating expenses together exceeded the premium it collected — an underwriting loss before accounting for investment income. Operating Ratio goes one step further, subtracting Investment Income Ratio (Net Investment Income divided by Earned Premiums) from Combined Ratio — the standard NAIC/A.M. Best adjustment. An insurer can run a combined ratio slightly above 100% and still be overall profitable once investment income earned on held premium is factored in, which is exactly what a lower Operating Ratio reflects.

Incurred Losses includes both claims already paid out and claims reserved for future payment (known but not yet settled). Paid Losses reflects only the cash that has actually left the insurer's hands so far. This calculator's headline Loss & LAE Ratio uses Incurred Losses, matching the standard actuarial definition — Paid Losses is tracked as its own separate output, Paid Loss Ratio, rather than feeding into the headline ratio.

Underwriting Profit = Earned Premiums minus Incurred Losses minus Underwriting Expenses minus Loss Adjustment Expenses. It's the dollar amount left over from premium after every claims and expense cost is subtracted — a positive figure means the insurer made money on underwriting alone, before any investment income on the premiums it holds.

Loss & LAE Ratio is (Incurred Losses + LAE) divided by Earned Premiums, so with the numerator held constant, a larger premium base in the denominator produces a smaller ratio — the same dollar amount of claims and claims-handling cost represents a smaller share of a bigger premium pool. This is why insurers watching their loss ratio pay close attention to premium growth, not just claims trends, when judging whether pricing is adequate.