This calculator will do a rough calculation of how much recurring revenue you can make with a subscription at different prices:

Common Prices : $5 | $10 | $19 | $29 | $37 | $47 | $67 | $97 | $127 | $167 | $197 | $297 | $397

# of Month(s) Rev per person Total Revenue
Month 1 $59.99 $17,997
Month 2 $119.98 $35,994
Month 3 $179.97 $53,991
Month 4 $239.96 $71,988
Month 5 $299.95 $89,985
Month 6 $359.94 $107,982
Month 7 $419.93 $125,979
Month 8 $479.92 $143,976
Month 9 $539.91 $161,973
Month 10 $599.9 $179,970
Month 11 $659.89 $197,967
Month 12 $719.88 $215,964
Month 13 $779.87 $233,961
Month 14 $839.86 $251,958
Month 15 $899.85 $269,955
With the 3 criteria you selected above: At $59.99 per month, with subscribers staying on for an average of 3 months, with 300 customers, you will make roughly $179.97 per subscriber, and a total of $53,991 in 3 months.
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