NFL line comparison calculator
Two lines. Two prices. See which offer has the higher modeled return. Free, no sign-in.
Your two offers
INSTANTCompare two offers for the same team in the same full-game market. American odds.
Offer A
Offer B
ML or 0 means a two-way moneyline with ties refunded. Whole-number spread pushes refund the stake.
−3 at −135 has the higher modeled return.
Offer B compared with Offer A, under the historical model.
This compares the two offers. It does not establish that either bet has positive expected value. Model averages across totals and assumes a balanced main spread.
How to compare NFL spreads and prices
Which line is better?
- Enter the main spread for your chosen team.
- Enter two offers for that same team: each spread and its American price.
- Compare the modeled return difference and the equal-return price for Offer B.
For a main spread of −3.5, compare −3.5 at −110 with −3 at −135. In the default model, the −3 offer has about $0.28 more expected return per $100 risked. An approximately −136 price at −3 would match the original offer's modeled return.
Why the half point matters
A win by exactly three loses at −3.5, refunds at −3, and wins at −2.5. Comparing prices alone misses that distinction. For each offer, the calculator uses win probability × decimal odds + push probability to estimate return per dollar risked. It compares those returns on equal stakes.
The same 3,028-game, 2015–2025 historical model powers the NFL alternate line calculator. It assumes a balanced main spread and averages across totals. Read the methodology and validation for its limits.
Compare the same spread at different prices
At the same −3.5 spread, −105 pays more on a win than −110. With a main spread of −3.5, the balanced model gives the −105 offer about $2.16 more modeled return per $100 risked. This differs from buying a half point: the spread and settlement outcomes stay the same.
For a ladder of estimates rather than a two-offer comparison, use the NFL alternate line calculator. To inspect market markup separately, enter opposing prices in the no-vig calculator.
NFL line comparison calculator FAQs
Does the higher modeled return mean a profitable bet?
No. This is a relative comparison under the historical model. Both prices may have negative expected value. The result does not remove vig from offered prices or prove your team has the model's assumed probabilities.
Why do I need the main game spread?
The main spread selects comparable historical games and anchors the model at a balanced main market. Either offer can be an alternate spread, but using an alternate as the main spread changes the game context and can distort the comparison.
Can I compare a spread with a moneyline?
Yes. Enter ML or 0 for a two-way moneyline on the same team. The model includes overtime and treats a final tie as a refund. It does not model a three-way moneyline where a tie is a loss.
How are pushes handled?
A whole-number spread can push, which returns the stake. The calculation includes that refund separately from wins and losses. The comparison uses the same amount risked on each offer.
Can I compare totals, live lines or different teams?
This tool is for pregame full-game NFL offers on the same team. It does not price totals, halftime markets, live situations or other sports. Estimates more than six points from the main spread are flagged as exploratory.