Upthrust Calculator
🧱 Forces & Newton’s laws. Use the Upthrust (Archimedes’ principle) formula to find upthrust, fluid density, volume submerged: pick the value you want, type the others, and the answer updates as you go.
The weight of the fluid pushed aside.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Upthrust | N |
| Fluid density | kg/m³ |
| Volume submerged | m³ |
Worked example
Find the upthrust when Fluid density = 1000 kg/m³, Volume submerged = 0.01 m³.
Using Fup = ρ V g: Upthrust = 98.1 N.
Frequently asked questions
What is the formula for Upthrust (Archimedes’ principle)?
Fup = ρ V g. The weight of the fluid pushed aside.
What do the letters stand for, and what units are used?
Upthrust in N, Fluid density in kg/m³, Volume submerged in m³.
How do you calculate upthrust?
Put the values into Fup = ρ V g. For example, with Fluid density = 1000 kg/m³, Volume submerged = 0.01 m³, upthrust = 98.1 N.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (upthrust, fluid density, volume submerged) and fill in the others: it rearranges the formula for you.
