How this calculator works
Subtract the original value from the new value, divide by the absolute original value, then multiply by 100.
Formula
((new − old) / |old|) × 100Subtract the original value from the new value, divide by the absolute original value, then multiply by 100.
Worked example
Default verified example is a verified test case used by the calculation engine.
Assumptions and limitations
- Use compatible units wherever the formula combines physical quantities.
- The calculator applies only the formula and assumptions stated on this page; it does not infer missing domain-specific rules.
- Results use finite-number arithmetic and should be interpreted with appropriate real-world measurement precision.
Frequently asked questions
How does the Percentage Change Calculator work?
Subtract the original value from the new value, divide by the absolute original value, then multiply by 100.
What units should I use?
Use mutually compatible units. The result follows the unit relationship implied by the displayed formula.
Is this result deterministic?
Yes. The same validated inputs and calculator version produce the same mathematical result; AI is not used for the calculation.