kindly check this http://preciseethiopia.com/download/publication/business_opportunities/Profile%20on%20the%20Production%20of%20Jam%20&%20Marmalade.pdf
As a guide 1.5kg of fruit, using 1.5kg of sugar and 250ml of water usually ends up making around 2 litres of jam (give or take) after boiling it down to its setting point. The best thing to do is to have spare storage jars and lids in the house to make sure you are covered. https://oakden.co.uk/jams-preserves-masterclass/
..preparation of jams, jellies, marmalades, candies, crystallized ... sugar in alternate layers ( 1.0 kg Fruit: 1 kg Sugar) (or) steeping fruit in syrup of ... http://www.eagri.org/eagri50/HORT381/pdf/lec15.pdf