Combined Ratio Calculator - Insurance Profitability

The Combined Ratio Calculator is built for people who need a defensible insurance combined ratio estimate without opening a spreadsheet from scratch. It uses the same inputs analysts normally collect for the calculation: incurred losses, underwriting expenses, and earned premiums. Because the input labels map directly to the formula, the result is easy to audit when you are checking a model, explaining an assignment, or comparing two scenarios in a meeting. The goal is not to hide the math behind a black box; it is to make the assumptions visible so the output can be challenged and improved. The calculation mechanism is straightforward: The loss ratio divides incurred losses by earned premiums, the expense ratio divides underwriting expenses by earned premiums, and the combined ratio adds the two percentages. The result panel keeps the main answer beside the supporting values so you can see whether one input is driving the conclusion. That is important for insurance combined ratio work because a single stale assumption can make a reasonable-looking answer misleading. A good review process is to calculate a base case, change one input at a time, and document which assumptions came from statements, quotes, contracts, tax rules, or operating data. Interpreting the answer requires context. A combined ratio below 100% indicates underwriting profit before investment income, while a ratio above 100% indicates an underwriting loss. Investment returns can still affect total profitability. The number should be compared with prior periods, peers, policy targets, or the decision threshold that matters for the situation. For planning work, it is often more useful to run a conservative case and an optimistic case than to debate one false-precision estimate. The worked examples on this page show the arithmetic with real numbers so you can sanity-check both the formula and the direction of the result. There are also caveats. Use earned premiums, not written premiums, when matching losses and expenses to the coverage period. Catastrophe losses, reserve releases, and reinsurance can make one period look unusually strong or weak. The calculator does not replace professional accounting, tax, legal, lending, investment, or operational advice when those rules control the decision. It is best used as a transparent first-pass estimate for insurance carrier analysis, underwriting reviews, agency education, investor comparisons, and line-of-business performance checks. If the result will support a contract, tax return, loan application, board package, or customer-facing claim, keep a copy of the source inputs and reconcile the estimate to the official document before relying on it.