Percentage Calculator
Six forms of the same question. Type two numbers, read the answer and the formula under it. The link holds the mode.
What is X percent of Y?
Type both numbers.
The question comes first
Most of these pages open on a formula name. You wanted 15 percent of 80, and the first screen asks you to pick among percent of, increase, decrease, change, difference and reverse, with the inputs buried under an essay.
This page starts with the question. What is X percent of Y. Increase Y by X percent. What was the original before the discount. Type the two numbers. The answer updates while you type. The formula under it has your numbers in it, not letters.
Six forms, six addresses
I ranked this sixteenth out of 1,754 in the queue, score 9.3, about six hours of work. Bing filled 15 completions on "percentage calculator". Increase, decrease, change and difference each pulled 11 to 15 more, with people adding formula, uk, omni or excel on the end. Reverse had 6, including reverse tax percentage calculator. That is 74 completions across the six forms, and they are not the same search.
calculator.net puts six tiny calculators on one cluttered page and none of them has its own address. omnicalculator wraps the inputs in a long article you scroll past, then asks you to pay for the rest. Here each tab writes ?mode= into the URL, so increase and reverse can be linked on their own.
The base has a name
A percent is always of something. 15 percent of 80 is 12 because 80 is the base. Raise 80 by 15 percent and you get 92. Cut it by 15 percent and you get 68. The page says which number sat in the denominator, right under the answer.
Reverse walks the other way. 85 after 15 percent off came from 100. 115 after a 15 percent markup came from 100 too. A 100 percent discount has no original left, so the page stops instead of dividing by zero.
Points are not a change
If a rate moves from 8 percent to 11 percent, that is 3 percentage points. It is also a 37.5 percent relative change, because 3 sits on 8. Those two numbers answer different questions, and mixing them up is how a headline gets a raise wrong.
Tick "These numbers are already percents" on the change tab and both figures show. Difference is a third thing: it uses the average as the base, so 10 and 15 differ by 40 percent. If you wanted a tip on a restaurant check, that is a different page, Tip and Bill Split. If you wanted inches from centimeters, use the Unit Converter.
What I will not print
A change that starts at zero has no percent I can show. Some calculators print Infinity and move on. This one names the missing base. The same thing happens when the two numbers in a difference average to zero, like 10 and -10.
After the layout has loaded you can unplug the cable and still get an answer. Mixpanel and Google Analytics load with the rest of Softery.io. They see that someone opened the tool. They do not get 15, or 80, or 12. I wrote the longer version in The Page Printed Infinity.
Common questions
Who sees the numbers I type?
Nobody on a server. The math runs in this tab. Mixpanel and Google Analytics load with Softery.io. They see that someone opened the tool and which mode you picked. They do not get the numbers.
What is the difference between change and difference?
Change measures from the starting number. 80 to 92 is a 15 percent change because 12 sits on 80. Difference uses the average of the two numbers as the base, so 10 and 15 differ by 40 percent. The page names the base under the answer.
Why does a zero starting number refuse to answer?
A percent of zero is not a number I can print. Some pages show Infinity. This one names the missing base and stops.
How does the share link work?
The mode and the two numbers sit in the query string. Copy link, paste it, and the other phone opens the same form. Nothing is stored on my side.