The program ABAKU was developed to support test engineers by their work dayly. Standard programs are used for calculating a lot of data, but this program stands for flexibility for new projects and fitting data. The target was to be the fast assistant by the dayly work. Using pocket calculators and formular books should be more rare in future. Even I will recommend ABAKUS for mechanical students, which are working in an engine lab. The program consists of 11 main menus, from where are serving 145 submenus with a lot more calculation modules behind. About the main menus: 1.Power,torque,b.m.e.p. 2.Fuel consumption. 3.Displacement,compressure ratio,air fuel ratio. 4.Turbocharger,-power,-efficiency,pressure ratio. 5.Thermodynamic,p*v^n. 6.exhaust emissions. 7.fuel combustion. 8.heat balance. 9.heat calculation,air,water,water/glysantin-mixture. 10.Bernoulli, liquidity,air. 11.crankshaft-connection rod unit, nozzle geometry, combined engine attitude angle. Equivalent variables are useable in several submenus, this functionality is optional. All important data are be written in a trace file and can be reread at a new program start. Some variables have got an value at the beginning of the program,they may be changed if desired. At the beginning of a new session within the main menu, it will be written a log file containing number of session,date, daytime and a descriptive text for all written data. Though the program ABAKUS itself has a good despription of all variables to give to the input and to calculate, there is an additional html-program to give a better overview of all applicated variables and their units. The structure of this overview is very similar to the calculation program. More information in the html-program is available by using mouse over feature. This program will be developed further, if there is a need by the users.