ProRataWise

Calculate earned and unearned insurance premium using exact policy dates.

This is a straight-line estimate. Your policy may apply fees, minimum earned premium, short-rate rules, taxes, or a different day-count method.

The policy end date is the last covered day , and the policy start date is the first covered day . Both are included in the total day count.

By default, the cancellation date is treated as the first day without coverage , so it is not counted as earned. If your policy treats it as the last covered day, switch the option in the calculator.

Days are real calendar days, so a term that crosses February 29 in a leap year counts 366 days for a full year.

Enter the policy-term premium — the actual amount for this specific term — not an annual figure you then prorate by hand.

All three use the default rule (cancellation date = first day not covered). Click a chip above to load any of them into the calculator.

Annual policy. Premium $1,200 , term 2026-01-01 to 2026-12-31, cancelled 2026-04-01.

365 total days · 90 earned · 275 unearned → earned premium $295.89 , estimated return $904.11 .

Leap year. Premium $2,400 , term 2028-01-01 to 2028-12-31, cancelled 2028-07-01.

366 total days · 182 earned · 184 unearned → earned premium $1,193.44 , estimated return $1,206.56 .

Six-month term. Premium $600 , term 2026-07-01 to 2026-12-31, cancelled 2026-10-01.