The current overall five-year relative stomach cancersurvival rateis 33.3%.
you might find more details about that here.
But, for practical purposes, most specialists use five-year survival rates.

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Because of this, survival rates for stomach cancer have been gradually improving year on year.
As such, what your statistical odds are this year may improve in the next.
(The remaining 10% of cases are unknown due to the lack of available data.)
Prognosis vs. A prognosis is based on individual factors that can increase or decrease your chances of survival.
A Word From Verywell
The five-year survival rate for stomach cancer is simply a statistic.
It is meant to guide you and your healthcare provider so you have an idea of what to expect.
It is not supposed to be taken as a hard-and-fast rule.
In 2022, an estimated 26,280 people were newly diagnosed with stomach cancer; 11,090 deaths were reported.
Stomach adenocarcinoma, the most common punch in, tends to grow slowly.
But diffuse cases, characterized by scattered and disorderly clusters of cancer cells, can be aggressive.
These are less common and more often seen in younger people.
National Cancer Institute Surveillance, Epidemiology, and End Results Program.Stomach cancer.
National Cancer Institute.Understanding cancer prognosis.
American Cancer Society.Key statistics about stomach cancer.
2020;5:52. doi:10.21037/tgh.2020.01.02
American Cancer Society.Signs and symptoms of stomach cancer.