Bond Calculator
Work out monthly home loan repayments, total interest, and amortisation.
Bond Calculator
Standard amortization with monthly compounding. Enter the annual interest rate as a percentage (e.g. 10 for 10%).
Your estimate
Monthly repayment
R 19 300
Total amount payable
240 monthly payments
R 4 632 104
Total interest paid
R 2 632 104
How this is calculated
Standard mortgage amortization formula:
Payment = P × [r(1 + r)ⁿ] / [(1 + r)ⁿ − 1]
- P — loan amount
- r — annual rate ÷ 100 ÷ 12
- n — loan term × 12 months
Example: R2 000 000 at 10% over 20 years → ≈ R19 300/month, ≈ R4.6m total.
Estimates only. Actual repayments may differ based on bank fees, insurance, and rate concessions.
Understanding home loan repayments
A home loan (bond) is repaid in monthly instalments over a set term, typically 20 or 30 years in South Africa. Each payment covers both interest and a portion of the capital.
Your interest rate has the biggest impact on total cost. Even a small difference in rate can add hundreds of thousands of rands over the life of the loan.
This calculator uses standard amortisation formulas to estimate your monthly repayment. Actual amounts may differ based on your bank's fees, insurance, and rate concessions.
Frequently asked questions
What interest rate should I use?+
Use the rate quoted by your bank or a prime-linked estimate. Most South African home loans are linked to the prime lending rate plus or minus a margin.
Does a longer loan term mean lower payments?+
Yes, a longer term reduces your monthly instalment but increases total interest paid over the life of the loan.
Can I pay extra on my bond?+
Most banks allow additional payments, which reduce outstanding capital and save interest. Check your loan agreement for any penalties or notice requirements.
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