The phrase "are often calculated" is correct and usable in written English.
It can be used when discussing methods or processes that involve computation or estimation, typically in a statistical or analytical context.
Example: "In financial reports, risks are often calculated to assess potential losses."
Alternatives: "are frequently assessed" or "are commonly determined".
Management fees are often calculated on the basis of all the money managed debt plus equity so that more borrowing means more pay.
"She says things that are kind of off the wall, but these are often calculated statements on her part, to register with conservative, grass-roots people, and that's very hard for folks who are not grass-roots conservatives to understand," he said.
Normal ranges are often calculated using simple statistical measures (for example, mean SBR ± 2 standard deviations).
For example, in birds or mammals, survival rates and population densities are often calculated based on minimum number alive [MNA].
Thermal parameters are often calculated based on empirical relationships developed for homogeneous clays, i.e., they are not necessarily valid for mixtures.
These strength profiles are often calculated using empirical relationships that relate measured log parameters (e.g. bulk density, compression wave velocity) to Unconfined Compressive Strength (UCS).
The price of a stock is often calculated in terms of a multiple of the company's expected per-share earnings.
In countries with earnings-related pension schemes the invalidity pension is often calculated in the same way as the old-age pension.
The misappropriation of religion is often calculated precisely in order to bar women from access to the resources which could bring about equality.
In the mass media of the day, with its appeals to a booming youth market, movies and advertisements were often "calculated to produce sexual thoughts and reactions," to the point where "we live in a sea of sexual provocation".
The amount of land that a tribe or band retained under a given agreement was often calculated on a per capita basis; some treaties allocated as few as 160 acres (approximately 65 hectares) for a family of five, while others provided as many as 640 acres (260 hectares) for the same number of people.
