Percentage calculator
Three boxes, one idea. Find a percent of a number, find what percent one number is of another, or recover the original from a part and a rate. Tip and discount tools use the same multiplication with friendlier labels.
What is X% of Y?
%
- Result
- 0
X is what percent of Y?
- Percent
- —
X is Y% of what?
%
- Whole
- 0
20% of 0 is 0 · can’t divide by a 0 whole · 0 is 20% of 0
Tipping customs and tax rates vary by place and by type of service. TipSplit is a calculator — not financial, tax, or etiquette advice.
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FAQ
What can this percentage calculator do?
Three jobs. (1) What is X% of Y — a 20% tip on $80 is $16. (2) X is what percent of Y — $16 of $80 is 20%. (3) X is Y% of what — $16 is 20% of $80. Same algebra, three directions. Results round to cents when the answer is money-shaped, and to two decimals when it is a percent.
How do you calculate a percentage of a number?
Part = whole × (percent ÷ 100). That is the tip formula, the discount-off formula, and the “what is 7% sales tax” formula. Type the percent in the first box and the whole in the second.
How do you calculate what percent X is of Y?
Percent = (part ÷ whole) × 100. If the whole is $0, there is no answer — dividing by zero is not a tip, it is an error, and we show that instead of inventing a rate.
How do you find the original number from a percent?
Whole = part ÷ (percent ÷ 100). If a $12 tip was 15%, the bill was $80. If the percent is 0, there is no whole to recover.
Is this the same as the discount or tip tools?
Same multiplication, different labels. Use Discount when you care about “was / now / you save.” Use Tip when you care about party size and pre-tax vs post-tax. Use this page when you just want the percent algebra without restaurant chrome.
Do you handle percent change (from A to B)?
Not as a labeled mode. Percent change is ((B − A) ÷ A) × 100. You can do that in the second mode by treating (B − A) as the part and A as the whole. A dedicated percent-change tool is not this MVP.
Why are some answers in dollars and some in percent?
Mode 1 and mode 3 return a number in the same units you typed (usually dollars). Mode 2 returns a percent. We do not assume currency. Type 200 people or 200 dollars — the math does not care.