TeaOptimiser: Optimal Teapot Filling

Number of People:
Teacup Size (ml):
Teacup Fill (%):
Teapot Size (ml):

Ideal Teapot Fill Range:

Assumptions

The general recommended teapot fill is between 80% and 90% of maximum capacity.
If a teapot is underfilled by too much, then it can be difficult to control the temperature of the brew since the hot water will cool down too fast due to the higher surface area to volume ratio (heat loss is proportional to the surface area, and stored heat energy is proportional to the volume). However, this can sometimes be preferable to achieve a more round and umami taste - some will even brew without a lid.
If a teapot is filled over 90% of capacity, then any in-built filters may get clogged with tea leaves, which will affect pouring.

Green: The teapot is the ideal size for the water required.
Yellow: The teapot should be filled to within the ideal fill range - decant excess tea into a pitcher.
Red: The teapot has been overfilled (exceeds 90% of capacity).
Grey: The teapot size is logistically too small for the water required.