Formula
The increase is applied forward, from the original value:
New value = starting value × (1 + increase percent)
The percentage calculator instead starts from two finished numbers and reports the change.
Assumptions
- The increase is zero or positive.
- The starting value may be negative.
Worked example
An 80 starting value increased by 25% becomes 100.
Input definitions
- Starting value
- The number before the increase.
- Increase
- The percent added, from 0 to 1,000.
Limitations
Results are rounded for display. This is a classroom calculation, not a measurement from a lab or a financial filing.
Questions
How do I find the percent between two numbers?
Use the percentage change calculator. This page starts with the percent and builds the new value.
Can the increase be more than 100%?
Yes, up to 1,000%.