This online tool allows you to calculate the buoyant force and weight of the liquid displaced by a submerged object in water.

This calculator computes the volume of body given the buoyant force and density of the body, assuming that the buoyant force equals gravity force.

Online calculator for solving problems related to balloon lifting force. It allows you to find the mass of the balloon shell, or the mass of the payload, or the required hot air temperature, or the volume of the balloon, from other known values.