Vapor Pressure of Water Calculator
Calculates the vapor pressure of water at a given temperature using various empirical formulas. The calculator provides results from the Antoine equation, the August equation, the Tetens equation, the Rankine equation, and the Clausius-Clapeyron equation. Note that these formulas are approximations and may have limitations in accuracy depending on the temperature range.
Vapor Pressure of Water Calculator gives you a faster way to work through practical calculation scenarios without rebuilding the same calculation from scratch every time. Start with Temperature and use the live outputs to estimate Vapor Pressure (Clausius-Clapeyron Equation), Vapor Pressure (Rankine Equation), and Vapor Pressure (Tetens Equation) in one pass. This page is built to help you compare scenarios quickly, validate rough assumptions, and move into a related calculator when you need a second angle on the same problem.
Use The Calculator In A Few Steps
Work through the inputs deliberately, then compare outputs instead of relying on a single scenario.
Scenario Checks
Use these examples to verify the behavior of the calculator before you run your own values.
What Users Usually Need Next
Keep the calculator open while you skim these answers so you can test the scenario that matters.
Related Calculators
These links are chosen to deepen the session and answer the next likely question without sending the user back to search.
STP Calculator
Calculates the volume or number of moles of a gas at Standard Temperature and Pressure (STP). STP is defined as 0°C (273.15 K) and 1 atm pressure. This calculator uses the ideal gas law to perform these calculations.
Osmotic Pressure Calculator
Calculates the osmotic pressure of a solution using the van't Hoff equation. Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
Van't Hoff Factor Calculator
Calculates the Van't Hoff factor (i), which represents the number of particles a solute dissociates into in a solution. This factor is important in colligative properties calculations.
Ideal Gas Law Calculator
Calculates pressure, volume, number of moles, or temperature using the Ideal Gas Law: PV = nRT. This calculator assumes ideal gas behavior.