Credit Card Repayment Calculator
Model how a fixed monthly payment reduces a rand credit-card balance at a user-entered annual interest rate. The schedule stops if the payment cannot cover the first month’s interest.
Compare payment and interest
Use the contractual annual rate from the latest statement. The result is a cash-flow estimate, not a settlement quote from a credit provider.
How to Use This Calculator
Enter your current credit card balance, annual interest rate (APR), and the amount you plan to pay each month. The calculator will show you how long it will take to clear your balance and how much interest you’ll pay in total.
- Your balance is the total amount you currently owe on your credit card
- APR (Annual Percentage Rate) appears on your credit card statement
- Monthly payment should be at least your minimum payment amount
- Try different payment amounts to see how you can reduce interest costs
How Credit Card Interest Works in South Africa
Credit card providers calculate interest using the Daily Periodic Rate (DPR), which is your APR divided by 365 days. This interest is applied to your outstanding balance each day.
Calculation Method
Interest is calculated daily and compounded monthly. The formula works as follows:
- Daily Periodic Rate = APR ÷ 365
- Daily Interest = Balance × Daily Periodic Rate
- Monthly Interest = Sum of all daily interest charges
Example Calculation
If you have a R1,000 balance with a 20% APR:
- Daily Periodic Rate = 20% ÷ 365 = 0.0548% per day
- Daily Interest = R1,000 × 0.000548 = R0.55 per day
- Monthly Interest (30 days) = approximately R16.44
Minimum Payments Explained
Most South African credit card providers calculate minimum payments as either a percentage of your balance (typically 1-3%) plus interest, or a fixed minimum amount (usually R5-R10), whichever is higher.
Why Minimum Payments Cost More
Paying only the minimum amount each month means:
- Most of your payment goes towards interest, not reducing your balance
- It takes significantly longer to clear your debt
- You pay substantially more in total interest charges
- You risk falling into persistent debt
Repayment Strategies
1. Pay More Than the Minimum
Even adding R10-R20 to your minimum payment can reduce your repayment time by years and save hundreds in interest.
2. Avalanche Method
If you have multiple cards, focus extra payments on the card with the highest APR whilst maintaining minimum payments on others. This minimises total interest paid.
3. Snowball Method
Pay off the smallest balance first whilst maintaining minimums on larger debts. This provides psychological wins and momentum.
4. Balance Transfer
Consider transferring your balance to a 0% interest card. This allows your entire payment to reduce the principal, though transfer fees typically apply.
5. Fixed Payment Plan
Set up a standing order for a fixed amount above your minimum. This creates consistency and prevents you from reducing payments as your balance decreases.
Common Repayment Scenarios
| Balance | APR | Monthly Payment | Time to Clear | Total Interest |
|---|---|---|---|---|
| R2,000 | 21.5% | R50 (min) | 6 years 3 months | R1,762 |
| R2,000 | 21.5% | R100 | 2 years 1 month | R521 |
| R2,000 | 21.5% | R150 | 1 year 3 months | R298 |
| R5,000 | 21.5% | R100 (min) | 10 years 8 months | R7,854 |
| R5,000 | 21.5% | R200 | 3 years | R2,183 |
| R5,000 | 21.5% | R300 | 1 year 10 months | R1,148 |
These examples demonstrate how increasing your monthly payment dramatically reduces both repayment time and total interest paid.
Frequently Asked Questions
Making Extra Payments Work for You
Small additional payments can create substantial savings over time. Consider these practical approaches:
Round Up Your Payments
If your minimum payment is R47, round it up to R50 or even R75. These small increases accumulate significant savings over the life of your debt.
Use Windfalls Wisely
Apply tax refunds, bonuses, or monetary gifts directly to your credit card balance. This immediately reduces your principal and future interest charges.
Cut One Expense
Identify one monthly subscription or habit you can eliminate temporarily. Redirect that amount to your credit card payment. A R15 monthly saving applied to your balance can reduce your repayment time by months or years.
Weekly Payments
Instead of one monthly payment, make weekly payments of one-quarter of your monthly amount. This reduces your average daily balance and the interest charged, as you’re paying down the principal more frequently.
Source notes from the base engine
Questions that affect this result
Why does the calculator reject a payment that equals the interest?
A payment equal to monthly interest leaves the principal unchanged. A smaller payment allows the balance to grow, so there is no finite payoff date under the entered assumptions.
Are credit-card service fees included?
No. Entered balance and interest are modelled, but monthly fees, insurance, penalties, cash-advance rates and new purchases are excluded. Add known fees to a separate cash-flow plan.
Does paying before the due date change the estimate?
Many cards calculate interest from daily balances, so an earlier payment can reduce interest. This monthly model cannot reproduce a specific issuer’s daily statement method.
What should I compare before moving a balance?
Compare the promotional period, transfer fee, post-promotion rate, required minimum payment and whether new purchases receive the same rate. A low headline rate alone is not the full cost.