What is 18 percent of 87.40. What percent is 12 of 80. What is the change from 50 to 65. PercentShift does those three jobs in the browser without a lecture. Use it when the question is raw arithmetic. Do not use it as a discount engine with VAT (DiscountShift), a tip splitter (TipShift), a loan amortizer (CalcShift), or a statistics package. Percent change from 50 to 65 is +30 percent, not +15 percent, which is the absolute difference people mix in. Going from 65 back to 50 is not -30 percent. That asymmetry is why this page exists.
Three modes in practice: percent of, 'X is what percent of Y,' and percent change. Enter the two numbers you have. Read the third. Percent of is multiply. Inverse is divide. Change is (new - old) / old. If old is zero, the change is undefined. The tool should not invent an infinity for a spreadsheet.
When not to use it: compound interest (CalcShift is closer, still not a full TVM), percentage points vs percent (a rate from 2 percent to 3 percent is +1 percentage point and +50 percent relative), and weighted averages. Also skip 'percent of a percent' until you write the formula down. DiscountShift wraps retail. This page stays primitive on purpose.
Privacy is local numbers. There is nothing to leak but your homework. Close the tab. LandedShift uses percents for duties; do the duty rate there, not as a random percent-of without the rest of the stack. Weighted averages are another formula; this page stays percent-of, inverse, and change on purpose.
18 percent of 87.40 is $15.73 (the tip). 12 is 15 percent of 80. Change from 50 to 65 is +30 percent. Change from 65 to 50 is about -23.1 percent, not -30. You write that on the slide so a client does not think the market 'gave it all back.' No values uploaded. You did not amortize a mortgage here. The slide that shows +30 percent up and not −30 percent back is how you stop a client mixing bases.
PercentShift calculates in the browser. Numbers never upload. There is no history of your homework. Close the tab when you have the result. There is no history of homework; close the tab when the result is in the sheet that is the record.
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Relative change uses the current base. 50 up 30 percent is 65. 65 down 30 percent is 45.5. To return to 50 you need a different percent. This is the usual slide-deck trap.
A rate from 2 percent to 3 percent rose 1 percentage point, which is a 50 percent relative increase. Say which one you mean. Say 'percentage points' when a rate moves 2 to 3; say 'percent' when you mean the relative change of 50 percent.
DiscountShift stacks sale price and VAT. PercentShift is the primitive operations those stacks are made of. DiscountShift stacks sale price and VAT; this page is the primitive operations those stacks are made from.
Not as a first-class TVM. CalcShift is the loan-shaped compound. A general compound formula belongs in a spreadsheet. A general compound formula belongs in a spreadsheet; CalcShift is the loan-shaped cousin, not a full TVM suite.
Related tools: DiscountShift · TipShift · CalcShift
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