§ Tool · tier 1 · independent
Interest-Free Period Calculator.
Understand and maximize your credit card's interest-free period
CalculatorFree, no signupOn-deviceupd May 2026
Inputs
Your numbers
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Move the sliders or type in the form on the left — the math updates live as you go. Click Get AI verdict when you want a written analysis.
Credit cards offer up to 55 interest-free days - but only if you pay in full. This calculator shows your actual interest-free period based on when you make purchases.
§ Worked examples
Real-world scenarios
Maximizing Interest-Free Days
Statement closes on 15th. Due date 21 days later (6th). $1,000 purchase made on 16th vs 14th.
Inputs
statement:15dueDays:21purchase1:16purchase2:14
Purchase on 16th: 51 days interest-free (appears on next statement). Purchase on 14th: only 22 days! For $1,000 at 20%, that 29 days difference saves $15.89.
§ FAQ
Questions Australians ask
§ GlossaryInterest-Free Period Time between purchase and due date when no interest is charged if paid in full. Statement Closing Date When your monthly statement is generated - purchases after this go on next statement. Due Date Deadline to pay your statement balance to avoid interest and late fees.