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Both calculators run independently — change the inputs on either side to compare results.

Thermodynamics and Enthalpy Calculator

Calculate Gibbs free energy and enthalpy changes for chemical reactions. Use this when predicting reaction spontaneity or thermodynamic feasibility at a given temperature and pressure.

Enthalpy Change (ΔH) (kJ/mol)

Entropy Change (ΔS) (J/(mol·K))

Temperature (K)

Pressure Correction

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Chemistry

Half-Life and Radioactive Decay Calculator

Determine how much of a radioactive substance remains after any period of time, or back-calculate the half-life from measured decay data. Ideal for radiometric dating, nuclear physics coursework, and radiation safety assessments.

Initial Amount (N₀) (atoms)

Half-Life (years)

Time Elapsed (years)

Decay Type

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Key differences

	Thermodynamics and Enthalpy Calculator	Half-Life and Radioactive Decay Calculator
Category	Chemistry	Chemistry
Inputs required	4	4
Result	Gibbs Free Energy (ΔG) (kJ/mol)	Remaining Amount (atoms)
What it does	Calculate Gibbs free energy and enthalpy changes for chemical reactions. Use this when predicting reaction spontaneity or thermodynamic feasibility at a given temperature and pressure.	Determine how much of a radioactive substance remains after any period of time, or back-calculate the half-life from measured decay data. Ideal for radiometric dating, nuclear physics coursework, and radiation safety assessments.