The best replacement for surface area is volume.

The best alternatives to surface area are rated as following:
★★★★★  volume
★★★★  area
★★  particle size
★  friction
★  volume ratio
★  reaction rate
★  total area
★  cross sectional area
★  total surface area
★  lateral area
★  sphere
★  volume sphere
  evaporation
  vapor pressure
  air resistance
  lateral surface area
  perimeter

Your alternative for surface area is not listed? Suggest!
Speaking about surface area, one probably shouldn't forget about scale factor.

Other search terms related to surface area and their ratings are:
★★★★★ scale factor
★ of a shpere
You have in mind a companion for surface area and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of surface area in all years. Click on graph for more.
surface area
volume
area