Greg Wittstock's simple breakeven analysis formula helps keep his pond-building business -- and the landscape businesses his company teaches it to -- in the black. Bo Burlingham details the formula in his feature "Building a Marketing Juggernaut," on page 58 of the November issue of Inc. magazine. Here, takes the breakeven analysis online with this easy-to-use calculator. Use it to discover your breakeven point and how you might achieve it.