Amortlane
A 30 year loan calculator for the person who produces the schedule rather than the person who signs it: the broker, the loan officer, the small lender and the landlord-investor who hand a client the payment, the first year's split between interest and principal, the total interest and what an extra payment does, and the 10-year home equity loan beside it. Worked on the page from your own principal, rate and extra payment, using the standard amortisation formula carried as a payment-per-thousand table. Free, no account. Pro keeps every client's scenarios, schedules and comparisons against the client and exports them. Nothing here is a rate of ours or a loan for sale; the worked example's rate is the Freddie Mac survey average, cited.