Increase a number by a percentage. Useful for price rises, salary hikes, markups, and anything that grows by a set percentage.
The percentage is applied to the original value to find the amount of the increase.
That amount is added back to the original value.
An increase of 100% doubles the number; an increase of 50% multiplies it by 1.5.
Increase amount: Value × Percent ÷ 100
Result: Value + Increase
A product priced at ₹200 goes up by 15%.
Original price: ₹200
Increase: 15%
Find the increase: 200 × 15 ÷ 100 = 30
Add it to the original: 200 + 30 = 230
Answer: ₹230 (an increase of ₹30)
A percentage increase calculator takes a starting value and a growth rate and tells you the new value after the rise. It also shows the size of the rise itself. If your rent is ₹18,000 and the agreement says it goes up by 5% each year, this is the tool that tells you the new rent and the extra rupees you will pay every month.
In India the same calculation turns up in salary appraisals, rent escalation clauses in eleven-month leave and licence agreements, fee hikes by schools, markups by shopkeepers and price revisions by manufacturers. The question it answers is always forward-looking: I know where I start and by how much it grows; where do I end up?
1. Write down the original value V and the percentage increase p.
2. Find the increase: increase = V × p ÷ 100.
3. Add it to the original: new value = V + increase.
4. As a shortcut, multiply once by the growth factor: new value = V × (1 + p ÷ 100).
5. For repeated increases, multiply the factors, not the percentages: V × (1 + p₁ ÷ 100) × (1 + p₂ ÷ 100).
6. Check that the new value is larger than V whenever p is positive.
Adding p% of a number to itself is the same as multiplying it by 1 + p ÷ 100. A 5% rise multiplies by 1.05, a 12% rise by 1.12 and a 100% rise by 2. Thinking in factors makes chained changes easy. Two yearly rent escalations of 5% give 1.05 × 1.05 = 1.1025, which is a 10.25% total rise, not 10%. The extra 0.25% is the increase on the first year's increase. This is the same compounding that drives fixed deposits and inflation, just done one step at a time.
This calculator applies a known percentage to a known starting value. The reverse question, how much did something rise, uses percentage change: (new − old) ÷ old × 100. Both use the original value as the base, which is why they agree. If a salary goes from ₹40,000 to ₹46,000, the change is 6,000 ÷ 40,000 = 15%, and applying 15% to ₹40,000 gives back ₹46,000. Mixing the two directions, for example dividing by the new value, is where most errors creep in.
Because the rise was computed on the original value, you cannot remove it by subtracting the same percentage from the new value. The new value is V × (1 + p ÷ 100), so the original is new ÷ (1 + p ÷ 100). If a price rose 12% to ₹1,120, the old price was 1,120 ÷ 1.12 = ₹1,000. Subtracting 12% of ₹1,120 would give ₹985.60, which is wrong. This asymmetry grows with larger percentages and is a favourite trap in aptitude tests.
Rohit pays ₹18,000 a month as rent in Pune, and his rental agreement allows the landlord a 5% increase at renewal.
Find the increase: 18000 × 5 ÷ 100
Add it to the original: 18000 + 900
Answer: Result after increase 18,900; Original value 18,000; Amount added 900
Adding percentages across years, such as treating three 10% hikes as 30% instead of 1.1³ − 1 = 33.1%.
Using the new value as the base when working backwards to the original price.
Confusing a 5% increase in an interest rate with a rise of 5 percentage points; 8% rising by 5% is 8.4%, not 13%.
Applying the hike to the gross figure when the agreement or appraisal letter applies it to a component, such as basic pay only.
Calculating a new salary after an annual appraisal or a revised stipend after a promotion.
Checking rent after the escalation clause in a lease or leave and licence agreement.
Setting a selling price from cost with a fixed markup percentage in a shop.
Estimating next year's school or college fee after an announced hike.
Projecting costs in a project estimate when material prices are expected to rise by a set percentage.
How do I reverse a percentage increase?
Divide by (1 + percent/100) — do not just subtract the same percentage. A price that rose 15% to ₹230 was originally 230 ÷ 1.15 = ₹200. Subtracting 15% from ₹230 would wrongly give ₹195.50.
What is a 100% increase?
It means doubling. The value goes up by an amount equal to itself, so 200 becomes 400.
How do I apply two increases one after the other?
Multiply them, instead of adding them. Two 10% increases in a row give 1.10 × 1.10 = 1.21, which is a 21% increase overall, not 20%.