If you add annual maintenance costs, then your calculator would be something I would recommend to people who are considering purchasing a house. I've seen suggestions that the annual cost would be 1% of the total house value, but I've also seen a value for that as high as FOUR percent!<p><a href="https://www.thebalance.com/home-maintenance-budget-453820" rel="nofollow">https://www.thebalance.com/home-maintenance-budget-453820</a><p>The mortgage market is very lucrative when it comes to adsense and other monetization strategies. If you could find a way to market what you've created, you could manage to generate significant passive income (a.k.a., the gift that keeps on giving).