Late Penalty Calculator

Five percentage points and five percent of score are not equivalent

For a 90% assignment two days late, a five-percentage-point deduction per day yields 90 − 5 × 2 = 80%. A penalty of five percent of the original score per day instead yields 90 × (1 − 0.05 × 2) = 81%. The difference comes from what the course policy means by percent.

This example assumes a linear deduction over two late days. Some institutions count calendar versus business days differently, round partial days, cap deductions or refuse submissions after a deadline. Read the exact syllabus rule and enter its method before interpreting a projected grade.

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Formula

points method: final = score − penalty points × days; score-percent method: final = score × (1 − penalty rate × days)

Five percentage points is different from five percent of the score

1. For a 90% mark submitted two days late, a 5-percentage-point daily deduction leaves 80%.
2. A linear deduction of 5% of the original score per day instead removes 90 × 0.05 × 2 = 9 points, leaving 81%.

What the result tells you

The difference comes from the penalty base. Similar-looking percentage wording can describe different calculations.

Before you use the result

Compounding, grace periods, calendar-day cutoffs, maximum deductions and automatic-zero rules are separate policies. Check the wording before selecting a method.

Useful for

• Late assignment scenarios
• Syllabus policy checks
• Grade planning

Supporting guides

• How to Calculate a Late Assignment Penalty