Enter both sides of the market and your own number. Out comes the gap between what you think and what the market thinks, with the fee stripped out.
The mistake that quietly ruins otherwise good handicapping is measuring your edge against the number on the screen. That number includes the sportsbook's fee. Beating it by a hair means you're roughly breaking even. This calculator removes the margin from both sides first, then compares your estimate against what's left — the market's actual opinion.
One to three points is a genuine, workable edge. Five or more usually means you've found a stale line, or that your model is missing something the market already knows — an injury, a lineup change, weather. A number far off the market is a reason to double-check your inputs before it's a reason to bet.
Knowing you have an edge doesn't tell you how much to risk. Feed the same numbers into the Kelly calculator for a stake size scaled to the size of the edge, and see the dollar value with expected value.
We run these numbers on every game on the board, every day — or see all ten calculators on one page.