How do I calculate percentage increase or decrease?

Subtract old from new, divide by old, then multiply by 100. A positive result is increase; negative is decrease.

How is tip per person calculated?

First calculate tip amount from bill and tip percent. Add it to bill total, then divide by number of people splitting the bill.

Apply discount first to get subtotal, then apply tax to the discounted subtotal for final price.

Find a percentage of any number.

X (percent) Y (number)

Result

Find the percentage relationship between two numbers.

X (part) Y (whole)

Result

Compare old and new values with absolute and percentage change.

Old value New value

Change amount: 0

Calculate tip, total bill, and split per person.

Bill amount Tip % Split count

Tip amount: $0.00

Total bill: $0.00

$0.00 / person

Apply discount first, then tax, and see your final price.

Original price Discount % Tax %

Discount amount: $0.00

Tax amount: $0.00

Final: $0.00

How do I calculate X% of Y?

Multiply Y by X, then divide by 100. Example: 20% of 150 = (20 × 150) ÷ 100 = 30.

How do I find what percent X is of Y?

Divide X by Y and multiply by 100. Example: 30 is 20% of 150.

How do I get percentage increase or decrease?

Compute (new − old) ÷ old × 100. Positive = increase, negative = decrease.

Do I apply tax before or after discount?

Usually discount is applied first, then tax is applied to the discounted subtotal.

Can I use this calculator on mobile?

Yes. The calculator is mobile responsive and updates instantly as you type.