keisoku

Loan Borrowable Amount Calculator

Find out how much you can borrow from a target monthly payment, or from your annual income and debt-to-income ratio. Based on a fixed-rate amortizing loan, it also shows the monthly payment, total repayment, and total interest.

Input

Calculation method

$
%
yrs

Result

Borrowable amount (1% APR, 35 years)

$35,425,103.00

Monthly payment

$100,000.00

Total interest

$6,574,897.00

Total repayment

$42,000,000.00

How it works

  • In "From monthly payment" mode, the borrowable amount is the present value of an amortizing loan: borrowable amount = monthly payment x ((1+r)^n - 1) / (r x (1+r)^n), where r = annual rate / 100 / 12 (monthly rate) and n = term in years x 12 (number of payments). When the annual rate is 0%, it is simply monthly payment x n.
  • In "From annual income" mode, the affordable monthly payment is annual income x debt-to-income ratio / 12, then the same formula gives the borrowable amount. The debt-to-income ratio is the cap on annual repayment as a share of income (lenders typically use roughly 25-35% depending on income).
  • Total repayment is monthly payment x number of payments, and total interest is total repayment minus the borrowable amount (the principal).
  • Calculations assume a fully fixed-rate amortizing loan and do not support bonus payments, variable rates, or early repayment.
  • Debt-to-income limits and qualifying interest rates vary by lender, and the actual amount you can borrow depends on underwriting based on income, other debts, credit history, and more.
  • Results are rounded estimates. The amount you can actually borrow depends on each lender's underwriting and calculation method; make any final borrowing decision at your own discretion.