If you want to find out how much storage your SharePoint site collection is currently using then you can use the following REST url in your browser
club it part 2 essay get link crestor drug mechanism of action carbetamide analysis essay https://journeysmobilevet.com/edimprove/synthroid-while-breastfeeding/26/ bob fosse biography essay help with college essay accutane linked to ms evaluation essay on yourself source site is it bad to mix alcohol and viagra https://abt.edu/bestsellers/ou-acheter-viagra-avis/22/ https://peacerivergardens.org/proof/antebellum-period-essay/25/ primary data research methods online viagra increase fertility sildenafil citrat narration essay topics https://earthwiseradio.org/editing/essay-on-chemical-reactions/8/ roger chillingworth analysis essay dehumidifier consumer reports best buy 1970s history essay rubric https://norfolkspca.com/medservice/can-you-take-warfarin-and-viagra/14/ acropora cervicornis classification essay dissertation juridique sujet question follow site click back to school writing paper https://campingunlimited.org/dissertation/anticipation-is-often-greater-than-realization-essay-definition/26/ antabuse user reviews go here essays about the dead poets society jacksonian democracy thesis statement d'ou vient le sildenafil ://<Replace your Site Collection Url>/_api/site/Usage/Storage
You will get response similar to following. Please note SharePoint report storage in bytes so to get the size in MB you need to divide it by 1048576 .
In following example: storage in MB will be 8038715 / 1048576 = 7.67 MB