How does this repayment frequency calculator work?

It builds a standard monthly P&I from your balance, rate, and remaining term, then shows equivalent fortnightly (monthly × 12 ÷ 26) and weekly (monthly × 12 ÷ 52) amounts so the annual total matches 12 monthly payments. It also sketches payoff time and interest if you pay more often, plus an optional accelerated view (half monthly fortnightly, or quarter monthly weekly). Educational only. Not a lender quote.

Is fortnightly always monthly times 12 divided by 26?

That is a common NZ teaching conversion for the same annual dollars. Some lenders instead quote a true fortnightly or weekly P&I. Always check what your bank will debit. We document the assumption clearly in the tool.

Why does paying fortnightly sometimes save interest?

Two different ideas get mixed up. Equivalent fortnightly keeps the same annual dollars but clears principal a bit sooner within the year. Accelerated fortnightly (half the monthly amount, 26 times) usually puts about one extra monthly equivalent in each year, so it often cuts more interest and time. Confirm which method your lender uses.

Can I use this instead of talking to a broker?

No. Use it to frame questions. Product rules, fixed-rate limits, and offsets need a real check. Online Home Loans is a referral service. We do not give mortgage advice or arrange lending.

Will my bank let me switch to weekly or fortnightly?

Often yes, but rules vary by product and fixed-term conditions. Extra repayment limits and fees can apply. Ask your lender or a licensed adviser before you plan around a switch.

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Repayment frequency calculator

Wondering whether weekly or fortnightly repayments beat monthly? Plug in your balance, rate, and remaining term for equivalent payment amounts and a rough interest and time sketch. Online Home Loans is referral only. We do not give mortgage advice. Outputs are estimates, not quotes.

Repayment frequency estimate

Compare equivalent weekly, fortnightly, and monthly home loan payments, then see a rough interest and time sketch if you pay more often. Educational only. Not a lender quote.

Loan balance (NZD)Approximate principal still owing.Interest rate (% p.a.)Remaining term (years)Used to set a standard monthly P&I, then derive equivalent weekly and fortnightly amounts.Current repayment frequencyUsed as the baseline when we sketch savings from paying more often at the equivalent annual total.

Results (estimates only)

Base monthly P&I (est.): $2,761. Annual from that monthly figure: $33,128.

Equivalent monthly: $2,761 /mo; Standard monthly P&I
Equivalent fortnightly: $1,274 /fn; monthly × 12 ÷ 26
Equivalent weekly: $637 /wk; monthly × 12 ÷ 52

Rough payoff at equivalent payments

Same annual dollars, paid more often. Interest accrues per period in a simple teaching model. Small time and interest differences are normal.

Monthly (current): 25 years; Interest ~ $378,212
Fortnightly: 25 years; Interest ~ $377,196
Weekly: 25 years; Interest ~ $376,760

Paying more often at the equivalent annual total

Switch to equivalent fortnightly: about $1,016 less interest with a similar payoff time, versus staying monthly on these assumptions.
Switch to equivalent weekly: about $1,453 less interest and roughly 0 months sooner, versus staying monthly on these assumptions.

Accelerated option (common Kiwi tip)

Some people pay half their monthly amount every fortnight (26 half-payments ≈ 13 monthly equivalents a year), or a quarter monthly every week. That is not the same as the equivalent conversion above. It usually clears the loan faster because you put more dollars in each year.

Accelerated fortnightly (monthly ÷ 2): $1,380 /fn; ~21y 3m · interest $312,999 · vs monthly: ~$65,213 less interest, ~3y 9m sooner
Accelerated weekly (monthly ÷ 4): $690 /wk; ~21y 3m · interest $312,596 · vs monthly: ~$65,616 less interest, ~3y 9m sooner

How the maths works

Monthly repayment ≈ standard P&I on balance at rate ÷ 12 over remaining months.
Equivalent fortnightly ≈ monthly × 12 ÷ 26. Equivalent weekly ≈ monthly × 12 ÷ 52.
Payoff sketches amortise period by period with rate ÷ 26 or ÷ 52 until the balance clears (or is flagged if it never does).
Accelerated fortnightly uses monthly ÷ 2; accelerated weekly uses monthly ÷ 4. Those put more dollars in each year than the equivalent conversion.

Ignores fees, rate changes, holidays, and lender-specific rounding. Real statements win.

When Kiwis usually run these numbers

People often compare repayment frequency when a fixed rate is ending, when cashflow lines up with payday, or before a refinance chat about structure. Pair this with the refix vs refinance calculator if you are still mid-fix and weighing a switch.

What this tool does not do

It does not quote your bank's exact debit amount or day-count rules.
It does not check fixed-rate extra repayment limits or fees.
It does not model offset accounts, revolving credit, or split loans.
It does not recommend weekly, fortnightly, or monthly for your situation.

Use it to frame the conversation, then talk to a licensed broker about your actual numbers.

Common questions

How does this repayment frequency calculator work?: It builds a standard monthly P&I from your balance, rate, and remaining term, then shows equivalent fortnightly (monthly × 12 ÷ 26) and weekly (monthly × 12 ÷ 52) amounts so the annual total matches 12 monthly payments. It also sketches payoff time and interest if you pay more often, plus an optional accelerated view (half monthly fortnightly, or quarter monthly weekly). Educational only. Not a lender quote.
Is fortnightly always monthly times 12 divided by 26?: That is a common NZ teaching conversion for the same annual dollars. Some lenders instead quote a true fortnightly or weekly P&I. Always check what your bank will debit. We document the assumption clearly in the tool.
Why does paying fortnightly sometimes save interest?: Two different ideas get mixed up. Equivalent fortnightly keeps the same annual dollars but clears principal a bit sooner within the year. Accelerated fortnightly (half the monthly amount, 26 times) usually puts about one extra monthly equivalent in each year, so it often cuts more interest and time. Confirm which method your lender uses.
Can I use this instead of talking to a broker?: No. Use it to frame questions. Product rules, fixed-rate limits, and offsets need a real check. Online Home Loans is a referral service. We do not give mortgage advice or arrange lending.
Will my bank let me switch to weekly or fortnightly?: Often yes, but rules vary by product and fixed-term conditions. Extra repayment limits and fees can apply. Ask your lender or a licensed adviser before you plan around a switch.