Chemistry Chemical reactions calculators

Rate Constant & Reaction Rate Order Calculator

Calculate the chemical reaction rate constant (k) from initial rates and reactant concentrations.

Input Parameters

Instant Real-time Calculation

Reaction Rate (M/s or mol/(L·s))

Concentration [A] (M)

Reaction Order with Respect to A (m)

Result Chemistry

Rate Constant (k)

Export calculation:

Calculation Logic:

Applies the empirical differential rate law to calculate rate constant k from measured reaction velocity and reactant concentrations.

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Understanding Rate Constant & Reaction Rate Order Calculator & Formula

Mathematical Formula: Rate = k × [A]^m × [B]^n; k = Rate / ([A]^m × [B]^n)

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Units of Rate Constant k by Overall Reaction Order

Overall Reaction Order	Rate Law Expression	Units of k
Zero Order (0)	Rate = k	M·s⁻¹ (or mol·L⁻¹·s⁻¹)
First Order (1)	Rate = k [A]	s⁻¹
Second Order (2)	Rate = k [A]²	M⁻¹·s⁻¹ (or L·mol⁻¹·s⁻¹)
Third Order (3)	Rate = k [A]³	M⁻²·s⁻¹ (or L²·mol⁻²·s⁻¹)

How to Use the Rate Constant & Reaction Rate Order Calculator

1 Input measured initial reaction rate in mol/(L·s).
2 Input reactant concentration in mol/L.
3 Specify reaction order m (0, 1, or 2).
4 Read the calculated rate constant k.

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