Reaction Rate Calculator

Calculate the average reaction rate from the change in concentration over time.

Reaction Rate Calculator

Calculate the average reaction rate from the change in concentration over time.

Formula
Rate = |Delta[concentration]| / Delta t
What is This Tool?

Reaction rate measures how fast a reactant is consumed or a product is formed over time. The average rate is calculated from the change in concentration divided by the time interval. Instantaneous rate at a specific moment requires calculus (the derivative of concentration vs. time).

Formula
Average Rate = |[C]final - [C]initial| / (t_final - t_initial) Units: mol/(L*s) or M/s
Worked Examples

1. Decomposition reaction

Given: [A] drops from 0.50 M to 0.30 M over 10 s

Rate = |0.30 - 0.50| / (10 - 0)

Rate = 0.20 / 10

Result: 0.02 M/s

2. Slow reaction

Given: [B] drops from 1.0 M to 0.95 M over 100 s

Rate = |0.95 - 1.0| / 100 = 0.05 / 100

Result: 0.0005 M/s

Frequently Asked Questions