Loss Ratio Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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The fastest way to make a finance estimate useful is to know exactly what went into it. Loss Ratio Calculator puts the relevant inputs beside the result so you can test the calculation instead of treating the number as a black box. On this page, it measures claims plus loss-adjustment expense relative to earned premium.

What this calculator does

Loss Ratio Calculator measures claims plus loss-adjustment expense relative to earned premium. Its visible inputs are Total premiums earned, Insurance claims paid, Loss adjustment 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 Total premiums earned, Insurance claims paid, Loss adjustment 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

Loss ratio = (claims paid + loss-adjustment expense) ÷ premiums earned × 100.

Example

Using the page’s demonstration values (Total premiums earned = 150,000; Insurance claims paid = 100,000; Loss adjustment expense = 10,000) and leaving the remaining defaults unchanged, the calculator returns 73.333% for loss 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. A higher loss ratio means a larger share of earned premium is being consumed by claims and loss-adjustment expense.

Limitations and notes

Loss ratio alone does not include underwriting expenses or investment income; use combined ratio when you need a broader underwriting-cost view. 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.