Property investment calculators — with real lending rules built in.
Five tools for the questions every investor asks before talking to a bank. Native NZ, AU and US rules — editable for any country. Built by an active investor, not a calculator-only side-project.
Debt-to-income calculator
See whether your next loan fits inside the RBNZ / APRA / US DTI cap before you talk to a bank.
Loan-to-value ratio calculator
Work out your LVR (or LTV in the US) and the deposit you need to clear investor and owner-occupied bands.
Rental property cashflow calculator
Weekly and annual net cashflow on a rental, with rates, insurance, management, vacancy and interest baked in.
Mortgage stress-test calculator
See what your repayments look like at the bank's stress-test rate — the rate they actually use to approve you.
Gross & net rental yield calculator
Gross yield, net yield and cap rate for any rental — with weekly-rent input for NZ/AU and monthly for the US.
Suggest a calculator
A calculation we don't have? Tell us — if it's high-leverage we'll build it.
A calculator is one input. A portfolio is a hundred.
Every tool here uses the same engine that runs inside Stackhold — the same DTI logic, the same LVR caps, the same rent-period defaults. So the numbers you see in a calculator are exactly the numbers you'll see in your portfolio model when you save the scenario.
That matters because real property decisions don't break down into single calculations. The right answer for "should I buy this?" depends on how it changes your DTI, your portfolio LVR, your overall cashflow, and your next-buy timeline — all at once. Stackhold runs every one of these calculators, simultaneously, across every property you own.
Use the standalone tools to scratch a quick itch. Open the full app when you want the answer to actually mean something.
Open the full appFive tools, one model, your portfolio.
Free to start. No card. NZ, AU, US — and editable for any country.
No credit card · Cancel anytime · Your data stays in your private cloud account