przybliżona kalkulacja

According to my rough calculations, we couldn't be more than two or three miles from the state road.

To predict if this method would be possible, they made use of a rough calculation.

According to John's rough calculations, the accident was miles ahead of them.

For my rough calculation this comes to about one in 250 trillion.

A rough calculation gave them about a day's warning before the visitors arrived.

Some rough calculations in his head told him it was about a thousand miles.

Now, there are some interesting features of this rough calculation.

These figures are rough calculations I made on the flight back, but they should be accurate to within two percent.

John rolled his eyes as he did a rough calculation.

These details and a few rough calculations raise an interesting possibility.