  The Submillimetre Common User Bolometer Array 2 (SCUBA-2) is the James Clerk
Maxwell Telescope's continuum imager, operating simultaneously at 450 and
850~$\mu$m. SCUBA-2 was commissioned in 2009--2011 and since that time, regular
observations of point-like standard sources have been performed whenever the
instrument is in use. Expanding the calibrator observation sample by an order
of magnitude compared to previous work, in this paper we derive updated opacity
relations at each wavelength for a new atmospheric-extinction correction,
analyze the Flux-Conversion Factors (FCFs) used to convert instrumental units
to physical flux units as a function of date and observation time, present
information on the beam profiles for each wavelength, and update
secondary-calibrator source fluxes. Between 07:00 and 17:00 UTC, the portion of
the night that is most stable to temperature gradients that cause dish
deformation, the total-flux uncertainty and the peak-flux uncertainty measured
at 450~$\mu$m are found to be 14\% and 17\%, respectively. Measured at
850~$\mu$m, the total-flux and peak-flux uncertainties are 6\%, and 7\%,
respectively. The analysis presented in this work is applicable to all SCUBA-2
projects observed since 2011.
