Percentage Increase / Decrease Calculator
PERCENTAGE INCREASE / DECREASE
P613
ADD, REMOVE OR REVERSE %
P613
START
value
PERCENT
%
SLIDER
25%
END
value
MODE
Increase • find end
RESULT
FINAL VALUE
READY
—
WORK
formula steps
01
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—
—
—
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PAGE 1/12
WHAT IT DOES
P613
PERCENT CHANGE TOOL
INFO
Purpose
This calculator adds a percentage, removes a percentage or reverses a percentage change.
Final
Use FIND END when you know the starting value and percentage.
Original
Use FIND START when you know the final value and need the value before the change.
Uses
It helps with discounts, markups, price rises, reductions, budgets and homework.
PAGE 2/12
FORMULAS
P613
FOUR COMMON FORMS
MATHS
Increase final
S × (1+p/100)
Decrease final
S × (1-p/100)
Reverse increase
E ÷ (1+p/100)
Reverse decrease
E ÷ (1-p/100)
Start value
S
End value
E
PAGE 3/12
HOW TO USE
P613
PAGE 1 STEPS
GUIDE
Step 1
Choose INCREASE to add a percent or DECREASE to remove a percent.
Step 2
Choose FIND END or FIND START.
Step 3
Enter the known values in the boxes.
Step 4
Press CALC, Enter, or move the percent slider.
PAGE 4/12
EXAMPLES
P613
WORKED ANSWERS
EXAMPLES
Increase
80 increased by 25% gives 80 × 1.25 = 100.
Decrease
80 decreased by 25% gives 80 × 0.75 = 60.
Reverse ↑
100 after a 25% increase means 100 ÷ 1.25 = 80.
Reverse ↓
60 after a 25% decrease means 60 ÷ 0.75 = 80.
PAGE 5/12
WHO USES IT
P613
COMMON USERS
USERS
Students
Solve percentage increase, decrease and reverse percentage homework.
Shoppers
Check discounts, sale prices and price rises.
Business
Calculate markups, reductions, invoices and budget changes.
Teachers
Show how percentage rise and fall affect values.
PAGE 6/12
FAQ
P613
COMMON QUESTIONS
FAQ
Add %?
Choose INCREASE and FIND END to add a percentage to a value.
Remove %?
Choose DECREASE and FIND END to remove a percentage from a value.
Reverse?
Choose FIND START to find the original value before the percentage change.
Zero?
A 100% decrease cannot be reversed because it divides by zero.
PAGE 7/12
BENEFITS
P613
WHY USE THIS PAGE
HELP
Fast
The calculator gives a final or starting value in one screen.
Clear
It shows the multiplier and formula step used.
Safe
Support text is split into internal pages, not forced into Page 1.
Mobile
Controls, result and pager remain visible on small screens.
PAGE 8/12
RELATED TOOLS
P613
MATHS LINKS
LINKS
PAGE 9/12
SEARCH TERMS
P613
QUERY COVERAGE
SEO
percentage increase calculator
percentage decrease calculator
add percentage to number
remove percentage from price
increase by percent calculator
decrease by percent calculator
percent change final value
add 20 percent to price
PAGE 10/12
MORE SEARCH TERMS
P613
EXTRA SEO TERMS
SEO 2
reverse percentage calculator
original price before discount
sale price discount calculator
price rise percentage tool
markup calculator percentage
reverse percentage decrease
reverse percentage increase
Teletext percent change tool
PAGE 11/12
SUMMARY
P613
CALCULATION SUMMARY
END
Increase
Use a multiplier above 1 to add a percentage.
Decrease
Use a multiplier below 1 to remove a percentage.
Reverse
Divide the final value by the multiplier to find the original value.
Return
Press NEXT to loop back to the calculator and solve another percentage change.
PAGE 12/12