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Use the Charles Law Calculator to find how a gas’s volume changes with temperature at constant pressure. Fast, accurate results.

Use the Partial Pressure Calculator to compute each gas’s pressure in a mixture using Dalton’s law and mole fractions.

Use an STP Calculator to convert gas volume between measured conditions and standard temperature and pressure (STP).

Learn how to estimate vapor pressure using the Antoine equation. Use the Vapor Pressure Calculator to compute pressure at a given temperature.

Use this Molarity Calculator to find molarity from moles and volume, or compute moles for a target molarity—quickly and accurately.

Use a Dilution Calculator to find the right amount of concentrate and diluent. Learn the dilution formula, units, and real examples.

Use a PPM Calculator to convert concentration to parts per million (and back). Includes dilution and unit conversions for quick, accurate results.

Use an ML to Moles Calculator to convert milliliters of a solution into moles using concentration and density when needed.

Use this Nernst Equation Calculator to compute cell potential (E) from temperature, concentrations/pressures, and reaction quotient.

Use this pH Calculator to compute pH from hydrogen ion concentration or from pH to concentration. Includes clear steps, formulas, and FAQ.