🛟Buoyancy Calculator

Free Buoyancy Calculator

This buoyancy calculator applies Archimedes' principle — the buoyant force on a submerged object equals the weight of fluid it displaces: F_b = ρ_fluid × V × g. Enter the fluid density, the object's volume, and its mass, and the calculator finds the buoyant force, the object's weight, and tells you whether it sinks, floats, or hovers neutrally.

An object floats when the buoyant force exceeds its weight — equivalently, when its average density is less than the fluid's density. For floating objects, the calculator also shows the fraction of the object's volume that ends up submerged, which equals the ratio of object density to fluid density.

Useful for physics coursework covering fluid mechanics, ship and submarine design, or just satisfying curiosity about why steel ships float. Free, runs entirely in your browser.