Time-Decay (Theta) Calculator
How fast a contract should drift to fair value.
Enter the current price, your fair price, and the days until it resolves. See the daily drift (theta) and where the price should sit tomorrow.
What is time-decay on a contract?
A binary contract has to end at 100¢ or 0¢, so if you think it’s mispriced, the gap to fair value should close as resolution nears. Theta is that daily drift — the mispricing spread over the days left. It’s a straight-line model, but it frames how much movement per day you’re counting on and whether there’s time for it.
Sharp App does this automatically across 100+ sportsbooks and apps — see the Prediction Markets.
More Advanced calculators
Bet strategically.
Not emotionally.
Sharp App surfaces the highest-value arbitrage and +EV bets across 100+ sportsbooks and apps in real time — every signal rooted in math, not personality picks.
Used anywhere · No charge during trial · Cancel anytime