Experimental data & uncertainty · SL/HL
Rate of Change Calculator
Enter the initial value, final value and elapsed time.
Your values
Start with the example or enter your own values. Use a dot for decimals and e for scientific notation.
Calculated locally. No account or input upload.
Result & working
ExampleThe calculator is loading. The worked example is also shown below.
Step-by-step working
The formula
average rate = (final − initial)/elapsed time
| Symbol | Meaning |
|---|---|
| rate | Signed average change per unit time. |
When to use this calculator
For a graph, this is the gradient of the secant between two points; instantaneous rate may differ.
Worked example
The page opens with these example values. The result below is pre-generated for reference.
- Δy = 7.8 − (2.4) = 5.4 mg
- rate = Δy/Δt = 5.4/12 = 0.45 mg/min
0.45 mg/min
Common mistakes
- Keep the sign if direction of change matters.