About the Handiwork Percentage Calculator
The Percentage Calculator handles the everyday percent math you actually need: find what X% of a number is, work out what percentage one number is of another, calculate percent increase or decrease, and add or subtract a percentage — all with instant, accurate results.
How to use the Handiwork Percentage Calculator
- Pick the type of percentage calculation you need.
- Enter your numbers.
- Read the result instantly.
Percentage change explained
Percent change measures how much a value has grown or shrunk relative to its starting value: subtract the old value from the new, divide by the old value, then multiply by 100. It is the right formula for price changes, growth rates, and before/after comparisons.
Common real-world uses
Use percentages to calculate discounts and sale prices, sales tax and tips, exam scores, commission, interest, and statistical comparisons. Having dedicated modes for each calculation removes the guesswork of remembering the right formula.
Frequently asked questions
How do I calculate a percentage increase?
Divide the increase (new value minus old value) by the old value and multiply by 100. The calculator does this automatically when you enter both values.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 25 out of 200 is (25 ÷ 200) × 100 = 12.5%.