Home, building & household
Calculation method and formula
r = Interest rate [% p.a.] ÷ 1200; n = round(Term in years × 12); Affordable monthly payment × (1 − (1 + r)^(−n)) ÷ r + Down payment
Understand the inputs
- Affordable monthly payment
- Use a measured value or your own assumption.
- Interest rate
- Unit: % p.a.. Use a measured value or your own assumption.
- Term in years
- Use a measured value or your own assumption.
- Down payment
- Use a measured value or your own assumption.
Assumptions and limitations
The model uses equal monthly payments and a nominal annual rate divided by twelve. At zero interest, principal is shared evenly. Fees, insurance and later rate changes are excluded.
The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.