Comparing Mortgage Terms Estimate the total cost in today's dollars of various mortgage alternatives. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Share | Related Content To Buy or Not to Buy The decision whether to buy or rent a home may have long-term implications. Should You Choose a Fixed or Variable? When selecting a mortgage, one of the most critical choices is between a fixed or variable interest-rate mortgage. Bi-Weekly Payments This calculator estimates the savings from paying a mortgage bi-weekly instead of monthly.