Term Deposit Calculator NZ - Compare Interest Returns

Home / Calculators / Term Deposit Calculator

Estimate how much a term deposit could grow over time using your starting balance, annual interest rate, and a term in either months or years. The chart below focuses on cumulative interest earned so the growth is easy to see.

How This Works

Calculate term deposit interest with a cleaner layout that fits your site.

This calculator follows the simple structure in your reference image: an initial deposit, a fixed term in months or years, and an annual interest rate. Results update instantly so readers can compare maturity values without jumping between pages.

The estimate assumes monthly compounding so shorter terms still produce realistic partial-year growth.
The chart shows cumulative interest earned over the term, which makes small gains easier to read than plotting the full balance.
It does not factor in RWT, fees, or early-withdrawal penalties, so think of it as a pre-tax estimate.

Calculate Term Deposit Interest

Initial Deposit

Over A Period Of ?

Term Deposit Interest Rate ?

Annual rate used for monthly compounding. This is a pre-tax estimate.

Quick Examples

$20,100.17 Your total balance

Total interest earned = $100.17

Principal $20,000.00

Effective Return 0.50%

Compounding Monthly

Short-term comparison

Use the months toggle when you want to compare short-term specials like 3-month, 6-month, or 9-month term deposits.

Longer maturity planning

Switch to years when you want to see a cleaner view of longer terms without manually converting the length into months.

Before-tax estimate

This version shows gross interest earned. If you publish rate comparison content later, you can pair this with a separate RWT calculator.

Why Use a Term Deposit Calculator NZ?

Securing a competitive interest rate is just the first step. With a dedicated term deposit calculator NZ, you can precisely forecast how much interest you will earn over your chosen investment term. Whether you are banking with ANZ, ASB, BNZ, Westpac, or a local credit union, use our tool to compare returns and maximize your savings goals in New Zealand.