List of biggest box-office bombs

In the film and media industry, if a film released in theatres fails to break even by a large amount, it is considered a box-office bomb (or box-office flop), thus losing money for the distributor, studio, or production company that invested in it. Due to the secrecy surrounding costs and profit margins in the film industry, figures of losses are usually rough estimates at best, and there are often conflicting estimates over how much a film has lost. To accommodate this uncertainty, the losses are presented as ranges where this is the case, and the list is ordered alphabetically in the absence of a definitive order. Because the films on the list have been released over a large span of time, currency inflation is a material factor, so losses are adjusted for inflation using the United States Consumer Price Index to enable comparison at equivalent purchasing power. Many box office bombs are films with average or negative critical reception, which can contribute to low theater attendance, but critically-praised films may still become box office bombs for other reasons, such as expansive budgets or release timing with other films.

Some films on this list grossed more than their production budgets yet are still regarded as flops. This can be due to Hollywood accounting practices that manipulate profits or keep costs secret to circumvent profit-sharing agreements, but it is also possible for films to lose money legitimately even when the theatrical gross exceeds the budget. This is because a distributor does not collect the full gross, and the full cost of a film can substantially exceed its production budget once distribution and marketing are taken into account. For example, tax filings in 2010 for Cinemark Theatres show that only 54.5 percent of ticket revenues went to the distributor, with the exhibitor retaining the rest. While the distributor's cut will vary from film to film, a Hollywood studio will typically collect half the gross in the United States and less in other parts of the world.