The practical guide is aimed at engineers and technically oriented business professionals in the manufacturing industry, whose tasks include creating quotes or estimating project costs. It outlines the various options available for quote and project calculations and the expected accuracy of these methods. The book is intended to encourage the establishment and use of these methods within one's own company to reduce the risk of overly high estimates leading to lost contracts or overly low estimates resulting in direct financial losses. It also highlights the limitations of the respective calculations. The 3rd edition has been updated following the currency change and specifically describes where the use of computers can simplify and accelerate calculations, including approaches using artificial neural networks for complex individual calculations.