Combined Ratio Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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A finance formula can look precise even when the assumptions behind it are doing most of the work. Combined Ratio Calculator keeps those assumptions visible and turns the fields on this page into one focused result. On this page, it combines insurer loss, loss-adjustment, and underwriting expenses relative to premiums.

What this calculator does

Combined Ratio Calculator combines insurer loss, loss-adjustment, and underwriting expenses relative to premiums. Its visible inputs are Claim loss, Loss adjustments, Premiums, Underwriting expense. The article follows those fields and the calculation that is actually available on this page; it does not silently add live market feeds, tax tables, legal eligibility tests, or other variables that are not present in the tool.

How to use it

Enter Claim loss, Loss adjustments, Premiums, Underwriting expense. Use the units and percentage scale shown beside each field, and keep values on the same time basis when the formula compares income, rates, prices, balances, or work hours.

How the calculation works

Combined ratio = (claim losses + loss-adjustment expenses + underwriting expenses) ÷ premiums × 100. The page also separates the loss and expense components.

Example

Using the page’s demonstration values (Claim loss = 100,000; Loss adjustments = 10,000; Premiums = 150,000; Underwriting expense = 25,000) and leaving the remaining defaults unchanged, the calculator returns 90% for combined ratio. Replace the sample inputs with values from the same period and definition before interpreting your own result.

How to interpret the result

Interpret the output according to the metric being calculated: a ratio, score, exchange relationship, chart level, safety incidence rate, or cost comparison. It is best for consistent measurement and scenario comparison, not for turning one metric into a complete business or investment decision. In the usual insurance interpretation, below 100% means underwriting premiums exceed the included claims and expenses, while above 100% means an underwriting loss before investment income.

Limitations and notes

Insurers can define earned premium, incurred losses, LAE, and underwriting expense under specific accounting/statutory conventions. A ratio below 100% indicates underwriting profit before investment income, not total company profitability. This tool uses the data you enter and does not independently validate the underlying source, legal classification, market quote, accounting treatment, or workplace recordability decision. A clean calculation can still be wrong if the source data or definition is wrong.