SCARCE

iWARM - Individual WAste Reduction Model
It helps you understand the energy saved by recycling small quantities of common household products, rather than landfilling them.  iWARM uses the same energy factors as WARM to provide the relative energy savings from recycling rather than landfilling.  The energy savings are translated into the equivalent amount of electricity, estimating how long that amount of electricity will operate a variety of household appliances.

Global Footprint Network will help calculate a footprint for businesses, individuals or cities.

National Geographic Human Footprint
Use this Human Footprint calculator to figure about how much of the world you use in a lifetime.