Find out how much a number grows or reduces when you add a percentage.
Enter the number and percentage and pick the right option – we’ll calculate the new total.
What is
%
?About
Why this is important
This calculation helps businesses and researchers predict changes in key metrics, analyse trends, and set realistic targets to ensure informed decision-making.
📌 Formula:
- Increase: New value = Original number × [1 + (percentage / 100)]
- Decrease: New value = Original number × [1 – (percentage / 100)]
Common use cases in statistics or business:
- Pricing & markups: Determine new prices after adding VAT, taxes, or discounts
- Market research: Predict how customer spending might shift with a % increase in product costs
- Survey sample size adjustments: If a researcher wants to increase a survey sample size by 25% to improve statistical reliability, they can calculate the new target. For example, if the original sample size is 1,200, the new required sample would be: 1,200 × [1 + (25/100)]=1,500
- Financial planning: Calculate how an investment grows with a percentage increase
