Zillow.com is an awesome tool for determining the value of a piece of property at any given time. Using their own top-secret “Zestimate” algorithm it looks at things like square footage, recent comps in the area, real estate growth in the zip code, and god knows what else to come up with a number that’s mathematically pretty close to the present-day market value of a home.

Zillow is great for sellers, but paired up with Trulia.com, Zillow can be even aweseomer for buyers.