The weekend box office number you read on Sunday is part count and part forecast: real Friday and Saturday grosses plus each studio’s projection for Sunday. On Monday the actual figures replace it, and the difference between box office estimates vs actuals is usually small, sometimes large enough to change who finished first.
The short version: Theaters report ticket sales to Comscore, studios turn that into a Sunday estimate, and the actual weekend gross lands on Monday afternoon. A Stanford study of 1,064 wide openings found Sunday estimates ran 6.38% high on average. In 2026 the revisions have mostly been within a couple of percent, but two weekends this year still ended with films swapping places on Monday.
Who counts the money
Nobody is required to publish grosses. As The Hollywood Reporter put it in 2020, “Hollywood studios are under no obligation to reveal box office grosses.” They do it because a big number is good publicity; Sony Pictures chief Tom Rothman told the paper, “Somebody realized that nothing sells like success.”
The plumbing is centralized. Theaters feed ticket-sales data directly into Comscore, and studios that subscribe can see it. Comscore’s own history of the service, published in April 2026, traces it to 1976, when Marcie Polier Swartz set up a centralized box office reporting service; it became part of Comscore through the 2016 merger with Rentrak, which is why trade stories still sometimes credit their figures to Rentrak. Comscore now measures box office in more than 70 countries.
The public-facing trackers, Box Office Mojo and The Numbers, publish what studios report and archive it. They do not always agree to the dollar; we explain the reasons in Box Office Mojo vs The Numbers.
How a weekend gross is built: Friday to Monday
Box Office Mojo laid out the method plainly in a 2010 weekend report: Sunday-morning figures are “calculated by adding reality-based estimates for Friday and Saturday to a projection for Sunday.” The Sunday portion is the guess. Studios base it on how similar films behaved on past Sundays, so the estimate is only as good as the comparison.
The sequence runs like this:
- Friday and Saturday: daily grosses come in from theaters. Trade sites publish running estimates through the weekend.
- Sunday morning: each studio issues a weekend estimate for its films, which becomes the headline in Sunday stories.
- Monday afternoon: actual Sunday grosses replace the projection. The Stanford researchers pointed readers to Box Office Mojo and The Numbers “on Mondays around 1pm Pacific Time” for the comparison.
Holiday weekends complicate the comparison, because studios may quote a three-day or a four-day figure; our guide to three-day and four-day holiday totals covers that wrinkle.
Box office estimates vs actuals: how far off do they run?
The best-known measurement is a Stanford Graduate School of Business study by Neil Malhotra and Edmund Helmer. Looking at the 1,064 films that opened in at least 1,000 theaters from 2003 to 2010, it found that opening-weekend Sunday estimates beat the eventual actuals by 6.38% on average, with Sony, Rogue and Summit above 7.9%. “The models studios use tend to be optimistic, which leads to inflation,” Malhotra said.
The study also found the bias grew when two films were close at the top: about 0.1% more for every million dollars the gap between them narrowed. Its extreme examples are memorable. Delgo, a 2008 animated release, reported a Sunday estimate of $568,240 and an actual of $164,160; CBS Films’ Extraordinary Measures, in 2010, estimated $2.14 million and came in at $1.15 million, an 86% overstatement. Malhotra was careful not to call it fraud: “Not at all. We are simply reporting an empirical regularity.”
The 2026 record looks tighter. Box Office Mojo’s estimate-versus-actual charts for this year show most of the top openers landing, by our count, within two percent of the Sunday figure, in both directions.
| Film (weekend) | Sunday estimate | Monday actual |
|---|---|---|
| Date Night (April 2010) | $27.1 million, No. 1 | $25.2 million, No. 2 |
| The Odyssey (opening, July 17-19, 2026) | $124,500,000 | $123,502,900 |
| Spider-Man: Brand New Day (opening, July 31-Aug. 2, 2026) | $355,000,000 | $360,091,572 |
| Toy Story 5 (Aug. 7-9, 2026) | $3,900,000, No. 5 | $4,217,398, No. 4 |
| Verity (opening, Oct. 2-4, 2026) | $32,618,776 | $32,031,011 |
| Digger (opening, Oct. 2-4, 2026) | $8,000,000, No. 5 | $8,001,856, No. 4 |
When Monday changed the rankings
April 2010: Date Night and Clash of the Titans. Sunday estimates had Fox’s Date Night at $27.1 million and in first place. On Monday its actual was $25.2 million, while Clash of the Titans, estimated at $26.9 million, came in at $26.6 million and took the top spot. Box Office Mojo’s explanation: Date Night “had a more bullish Sunday projection than Clash.” Clash had actually led on both Saturday and Sunday.
August 7-9, 2026: Toy Story 5 and Super Troopers 3. Searchlight’s Super Troopers 3 opened with a $4,000,000 estimate, just above Toy Story 5’s $3,900,000 in its eighth weekend. The actuals were $4,002,283 and $4,217,398, so the Pixar film finished fourth.
October 2-4, 2026: Digger and Primetime. A24’s Primetime, in its second weekend, reported $8,000,085, eighty-five dollars ahead of Warner Bros.’ new Digger at $8,000,000. Monday’s actuals put Digger at $8,001,856 and Primetime at $7,748,406, a 3.1% drop that swapped fourth and fifth place.
Estimates can run low too
The Stanford finding is an average, not a rule. Spider-Man: Brand New Day opened July 31 with a Sunday estimate of $355,000,000; the Monday actual was $360,091,572, an upward revision of $5,091,572, or 1.4%, according to Box Office Mojo. Toy Story 5 came in 8.1% above its estimate on the August weekend above. A cautious Sunday projection on a film with strong late-weekend business produces exactly this.
Domestic vs worldwide: why the global number keeps moving
Everything above concerns the domestic (U.S. and Canada) weekend. Worldwide figures add another layer: international grosses are reported in local currencies, converted to dollars, and not every market reports on the same schedule, so global totals are more fluid than domestic ones. Our explainers on what domestic, international and worldwide totals include and how currency conversion changes worldwide totals go into detail.
To read a weekend report well: check whether the figure is labeled an estimate, note the studio projecting it, and look again on Monday afternoon. The Hollywood Reporter’s October 11, 2026 report credited Other Mommy with “around $27.5 million” and the overall weekend with “an estimated $88 million,” per Rentrak. Those are Sunday numbers; the actuals arrive Monday.
Frequently Asked Questions
How are box office estimates different from actuals?
Estimates are released on Sunday and combine real Friday and Saturday grosses with a studio projection for Sunday. Actuals replace them on Monday, once real Sunday ticket sales are counted.
Are Sunday box office estimates usually too high?
Historically, yes. A Stanford study of 1,064 wide openings from 2003 to 2010 found Sunday estimates ran 6.38% above actuals on average for opening weekends. They can also come in low, as Spider-Man: Brand New Day did in 2026.
When are weekend box office actuals released?
On Monday afternoon for a normal weekend. The Stanford researchers pointed readers to Box Office Mojo and The Numbers on Mondays around 1pm Pacific Time.
Who tracks box office numbers?
Theaters report ticket sales to Comscore, which traces its service back to 1976. Studios release the figures publicly, and Box Office Mojo and The Numbers publish and archive them.
Can a movie lose first place after the weekend?
Yes. In April 2010 Date Night led on Sunday estimates, but Monday actuals put Clash of the Titans first. In 2026, Monday actuals reordered films lower in the top five on the August 7-9 and October 2-4 weekends.
Sources
- Weekend Report: ‘Titans’ Fall But Still Tall — Brandon Gray, Box Office Mojo, April 12, 2010
- Neil Malhotra: What Does a Hollywood Blockbuster Look Like? — Stanford Graduate School of Business, February 2012
- Domestic 2026 Weekend 31: estimates vs actuals — Box Office Mojo (IMDbPro), accessed October 11, 2026
- Domestic 2026 Weekend 32: estimates vs actuals — Box Office Mojo (IMDbPro), accessed October 11, 2026
- Domestic 2026 Weekend 40: estimates vs actuals — Box Office Mojo (IMDbPro), accessed October 11, 2026
- Domestic 2026 Weekend 29: estimates vs actuals — Box Office Mojo (IMDbPro), accessed October 11, 2026
- Box Office Reporting May Be “Forever Changed” Due to Pandemic — Pamela McClintock, The Hollywood Reporter, November 3, 2020
- Five Decades of Box Office Intelligence: Comscore Celebrates 50 Years of Movie Measurement — Comscore, Inc., April 15, 2026
- ‘Social Reckoning’ Goes Dark With $5.5M as ‘Other Mommy’ Delivers at Box Office — The Hollywood Reporter, October 11, 2026