How to use this calculator
- Enter affordable monthly loan payment, nominal annual rate (%), monthly periods.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Fees, income eligibility, other debts, tax and insurance are excluded. The payment budget is your own assumption.
Worked example
A payment budget of 500 over 24 months at 0% supports principal of 12,000 before fees.
What the result means
Solve the loan amount supported by a chosen payment budget; this is not a lender approval.
Common questions
How is the calculation performed?
Affordable principal is the present value of monthly payments discounted at nominal annual rate / 12; at zero rate it is payment × months.
What does the model leave out?
Fees, income eligibility, other debts, tax and insurance are excluded. The payment budget is your own assumption.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.