If you need a really simple way to calculate both power (mains) transformers and audio transformers (be it a push-pull or single ended ones) mainly for tube amplifier builds and projects, DelatschTransformerCalculator is a perfect solution for you.You just need to specify couple of basic parameters like voltages and currents you need or input and output impedances for output transformers and the calculator does almost everything else for you. The calculator is based on my tried and true spreadsheet calculators but has some improved features that were not possible to implement in the spreadsheet versions.
You can calculate any power and output transformer used in vintage and modern guitar tube amplifiers and also for any other similar electronics DIY project you are working on. It can also be used for calculating line output transformers or output transformers with as many taps as you wish.

Calculate for any type of E-I type core you have even if you are not sure what flux density to use.

The app is extremely easy to use and there will be a full video tutorial available soon on my YouTube channel and support page.