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Jonas Method App
title: JONAS METHOD app url: / layout: default meta: title: "JONAS METHOD app — natural fertility tracking by Dr. Jonas" description: "Personalised bio-cycle calendar for Natural contraception, Fertile days, Viable child and Boy or girl planning. Reliability 98.6%. In use since 1956" ---


JONAS METHOD app


  Official natural fertility tracking by Dr. Jonas






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  • Personalised calendar based on your bio-cycles


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  • Reliability 98.6%


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  • In use since 1956


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  • Contraception without medication


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  • Supporting conception even after a long-term struggle


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  • Conceiving after miscarriage or complications


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  • Possibility to plan a baby boy or a girl






Provided by Centrum Jonas - the only calculation center led by the family of Dr. Eugen Jonas.



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➜ Jonas Method


JONAS METHOD app


  Official natural fertility tracking by Dr. Jonas








Provided by Centrum Jonas - the only calculation center led by the family of Dr. Eugen Jonas.



© Centrum Jonas 2026