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Refinance Personal Loan Calculator

Calculate your monthly savings by refinancing your personal loan using our trusted tool
Updated 3 May 2026​
​How to Use Our Refinance Calculator
Refinancing a personal loan can lower your monthly payments, reduce your total interest cost, or both. Our calculator shows you exactly how much you would save in seconds.

To use the calculator:
  1. Enter your current loan details in the left panel, including the loan balance remaining (not the original amount you borrowed), the number of months left on your current loan, and the interest rate you're paying.
  2. Enter your refinanced loan details in the right panel, including the new loan amount (usually equal to your current balance), the new loan term in months, and the interest rate you have been offered or are considering.

The calculator will show three key results:
  • Monthly saving: the difference between your current monthly payment and the refinanced payment
  • Total interest saved: how much less interest you would pay over the life of the new loan, often the most important figure
  • Total amount saved: the combined cash impact of refinancing, including both the principal and interest differences
Current

Your existing loan

Monthly payment $0
Total interest remaining $0
Refinanced

Your new loan

Monthly payment $0
Total interest paid $0
Monthly saving $0
Total interest saved $0
Total amount saved $0

Adjust the inputs above to compare your existing loan with a refinanced version.

Compare Personal Loan Lenders
Disclaimer: This is a guide using standard assumptions to estimate your monthly personal loan repayment cost. It excludes late fees, early repayment fees, account management fees and penalty interest for late repayments. Before refinancing any loan, ask  the lender for the total cost of the borrowing and compare this to your existing loan agreement. This calculator assumes interest rates are fixed - some lenders offer floating interest rate personal loans.

Compare Debt Refinance Rates From New Zealand's Major Lenders

  • The calculator below shows what refinancing your debt would cost with each of New Zealand's major lenders.
  • Adjust the loan amount, term, and payment frequency to match your situation.
  • Lenders are listed in our editorial order.

Enter your loan details

Repayment frequency
Important: Calculations use the standard amortisation formula and reflect the interest rate only. Establishment fees, monthly account fees, and other lender charges are not included and may apply on top of these figures. Interest rates shown are advertised rates and may vary based on your credit profile, the loan amount and other factors. Always confirm current rates and fees directly with the lender before applying.

​Alert: Are you looking for cost-effective car finance? Simplify Slashes Rates - now from 6.85% p.a.
For borrowers with decent credit and affordability (we believe if you're reading and comparing on MoneyHub, there's a greater chance that's you), Simplify just dropped its rates to the lowest we've seen in some time:
Many readers checking multiple lenders and reading guides already have the credit profile these rates require - you can confirm this in 1-2 minutes using Simplify.
Christopher Walsh
MoneyHub Founder
Unlock the Best Personal Loan Rates with MoneyHub – Don't Overpay When Getting Personal Loan

Are you tired of overpaying with high interest rates and exorbitant fees? Our research shortlists three outstanding lenders known for their fair rates and reliable service:
Checking what interest rate you'll get is quick and easy - just a few minutes could save you thousands, given the range of interest rates. 

Remember, it's the interest rate you agree to now that makes a huge difference when you repay your loan week after week. We believe that signing up for finance with a car salesperson or via a bank is unlikely to be the cheapest option.

Advertising Disclosure: We may earn a commission from loans, but our top picks are always based on rigorous research and your best interest.
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