Every commercial bank uses the same reducing-balance formula: EMI = P × r × (1+r)n ÷ ((1+r)n − 1). P is the principal, r is the monthly rate (annual ÷ 12 ÷ 100), and n is the number of instalments (years × 12). Crucially, interest each month is charged on the outstanding balance — not on the original amount.
Home loans generally land in the 8% to 13% range per annum. Nepal Rastra Bank publishes a base rate and individual lenders add their own spread on top, so it pays to compare two or three quotes before picking a bank.
Rule of thumb: banks let the EMI take 50–60% of net monthly income. A Rs 1,00,000 take-home works out to roughly Rs 50,000–60,000 of EMI capacity — work backwards from that using the calculator to see what loan amount fits.
Most banks stretch home loans to 20–25 years. Vehicle loans tend to cap at 5–7 years, personal loans at 1–5 years, and education loans around 5–10 years. Pushing the tenure out lowers the EMI but you'll pay considerably more interest in total.
Flat rate charges interest on the original principal throughout the tenure, so the effective cost is far higher than the quoted rate suggests. Reducing balance — the method Nepal's banks use and what this calculator applies — charges interest only on what's still owed, so the interest portion of each EMI falls steadily as the loan is paid down.