$300,000 Mortgage Repayments

Calculate repayments on a $300,000 home loan at current average rates. Compare monthly, fortnightly, and weekly schedules.

Last verified: 1 July 2025

Monthly repayments on a $300,000 mortgage at 6.25% over 30 years: $1,847.15

Monthly

$1,847.15

Fortnightly

$852.53

Weekly

$426.27

Total cost over 30 years

$664,975

Principal $300,000 + Interest $364,975

Total interest paid

$364,975

122% of the loan amount

25-Year vs 30-Year Term

	25 years	30 years	Difference
Monthly repayment	$1,979.01	$1,847.15	+$131.86/mo
Total interest	$293,702	$364,975	Save $71,272
Total repaid	$593,702	$664,975	Save $71,272

What If Rates Change?

Rate	Monthly	Fortnightly	vs current
5.75%	$1,750.72	$808.02	-$96.43/mo
6.25%(current)	$1,847.15	$852.53	—
6.75%	$1,945.79	$898.06	+$98.64/mo
7.25%	$2,046.53	$944.55	+$199.38/mo
7.75%	$2,149.24	$991.96	+$302.09/mo

Income Needed

You'd need a household income of approximately $73,886/year ($6,157/month) to comfortably afford this mortgage using the 30% rule — where no more than 30% of your gross income goes toward housing costs.

Extra Repayment Impact

Paying an extra $100/week on your $300,000 mortgage:

Saves $158,646 in interest
Pays off your loan 11.5 years sooner

Fortnightly vs Monthly Trick

Paying $923.58 fortnightly (half the monthly repayment) instead of $1,847.15 monthly means you make 26 half-payments per year — equivalent to 13 monthly payments instead of 12.

Interest saved: $81,086
Time saved: 5.7 years

Frequently Asked Questions

How much are repayments on a $300,000 mortgage?

At 6.25% over 30 years, monthly repayments on a $300,000 mortgage are $1,847.15. Fortnightly repayments are $852.53 and weekly repayments are $426.27.

What income do I need for a $300,000 mortgage?

Using the 30% rule (no more than 30% of gross income on housing), you would need a household income of approximately $73,886 per year to comfortably afford a $300,000 mortgage at 6.25%.

How much interest will I pay on $300,000 over 30 years?

At 6.25%, the total interest on a $300,000 mortgage over 30 years is $364,975. The total amount repaid would be $664,975.

What if interest rates change on a $300,000 mortgage?

If rates rise by 1% to 7.25%, monthly repayments on a $300,000 mortgage increase to $2,046.53 — an extra $199.38 per month.

Other Mortgage Amounts

$200K mortgage $250K mortgage $350K mortgage $400K mortgage $450K mortgage

See at Specific Rates

$300K at 4%$300K at 4.5%$300K at 5%$300K at 5.5%$300K at 6%$300K at 6.5%$300K at 7%$300K at 7.5%$300K at 8%

General information and estimates only — not financial, tax, or legal advice. Always verify with a licensed adviser or the ATO.

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