In der VOB/B ist die Bestimmung für die Preisanpassung nicht genau festgelegt. Die Berechnung erfolgte bislang grundsätzlich durch die “vorkalkulatorische Preisfortschreibung”. Diese Rechtsprechung hat der BGH im Jahr 2019 mit zwei grundlegenden Entscheidungen geändert (hier aber in Hinblick auf § 2 Abs. 3 VOB/B).

In the VOB/B, the determination of the amount of the claim is not precisely specified. Up to now, the adjustment of the calculation was basically carried out by applying a ”pre-calculated price update – vorkalkulatorische Preisfortschreibung”. This case law was changed by the BGH in 2019 with two fundamental decisions (here, however, with regard to Section 2 (3) VOB/B).

https://adfontes.law/contractual-price-adjustment-due-to-an-...

By analogy, nachkalkulatorish would be post-calculated

German term (edited): vorkalkulatorisch ermitteln/t

nachkalkulatorisch ermittelt: post-costed

kalkulatorisch: the starting point is Kalkulation that is a 'fuzzy match' IMO verging on a false friend with calculation, but meaning costing.

Read the phrase as a whole with ermitteln.

Link to Einzel- und Gemeinkosten : individual and overhead (Zahn banking & finance dictionary) costs to capture the true flavo(u)r, in general, and in the catering trade, in particular (see the example sentence and second weblink).

The cost estimate shall be based on the overhead rates worked out in advance at the time of the preparation of the offer. Invoicing within the framework of the annual and final invoice(s) shall be carried out in accordance with the Price Ordinance to the amount of the individual and overhead costs actually incurred and worked out in advance;