Percentage Change Calculator (Increase & Decrease)

About the Percentage Change Calculator

Petrol moves from Rs. 259 to Rs. 272 and every driver asks the same thing: how big is that jump? Percentage change is the everyday arithmetic of prices, fees, salaries and marks — the tool that turns two numbers into one comparable figure. This calculator handles the two-value case (old versus new) and the one-step cases of adding or subtracting a percentage, with the sign and the label spelled out.

The change formula divides by the old value: percentage change = (new − old) ÷ old × 100. Petrol rising from 259 to 272 works out as 13 ÷ 259 × 100 = 5.0193, printed as +5.02 percent — an increase. Falling the same 13 rupees would read −5.02, a decrease. Add mode multiplies by (1 + p ÷ 100); subtract mode multiplies by (1 − p ÷ 100) — so 5,000 plus 10 percent is 5,500, and 5,000 minus 15 percent is 4,250.

Everything runs inside your browser with nothing stored or sent. Use it for a price jump, a fee revision, a discount check or a month-on-month sales comparison — anywhere two values deserve an honest percentage, computed to two decimals and labelled increase, decrease or no change.

How to Use the Percentage Change Calculator

Follow these simple steps — the whole process takes under a minute:

1. Pick the mode — change between two values, add a percentage, or subtract one; the form swaps with the dropdown.
2. Change mode: enter old, then new — order matters, because the old value is the base of the comparison.
3. Add or subtract: enter the value and the percentage — 5,000 with 10 gives 5,500; with 15 subtracted, 4,250.
4. Press Calculate — or simply edit any field, because every result refreshes as you type.
5. Read the sign and the label — plus for an increase, minus for a decrease, and No change when values match.

The Formula & Method Behind the Percentage Change Calculator

Change between two values = (new − old) ÷ old × 100, kept signed so direction survives the arithmetic. The petrol case: (272 − 259) ÷ 259 × 100 = 13 ÷ 259 × 100 = 5.0193, shown as +5.02% with an Increase label. Dropping from 250 to 200 gives −50 ÷ 250 × 100 = −20.00%, a Decrease; equal values read 0.00% and No change.

The add and subtract modes are single multiplications: value × (1 + p ÷ 100) and value × (1 − p ÷ 100). Five thousand plus 10 percent is 5,000 × 1.10 = 5,500; five thousand minus 15 percent is 5,000 × 0.85 = 4,250. The rows show the amount added or removed — 500 and 750 rupees respectively — so the percentage and the rupees always agree.

The old value sits in the denominator because it is the base being measured against — the same rupee move reads differently at different levels. A fee climbing from Rs. 85,000 to Rs. 92,000 adds Rs. 7,000: 7,000 ÷ 85,000 × 100 = +8.24%. The identical Rs. 7,000 on a Rs. 35,000 salary would read +20.00% — same rupees, different percentage. Mind the unit too: an interest rate moving from 5 percent to 7 percent rises 2 percentage points but +40 percent in relative terms, and this calculator reports the relative figure.

Percentage Change in Daily Life — Prices, Fees and Marks

Fuel is the recurring one. Pump prices revise fortnightly, and a +5.02% revision on a Rs. 259 litre changes a fill-up and every journey after it. Size the monthly impact route by route with the trip fuel cost calculator — percentage change tells you the size of the shock, and the trip maths tells you yours.

Fees and salaries move in percentages too. A school fee going from 85,000 to 92,000 is +8.24 percent, and a raise of the same size deserves the same check — then the take-home view, because gross increases land differently after tax. The salary tax calculator shows what a raised salary actually pays under the FBR slabs.

A discount is a percentage decrease with marketing attached. Five thousand minus 15 percent is Rs. 4,250 — the arithmetic here — but stacked offers multiply rather than add, and the sticker rarely does that maths for you. Verify the final price with the discount calculator, which handles percent-off and stacked sale prices in rupees.

Marks and scores. Change arithmetic also reads improvement — a test score climbing from 410 to 450 is +9.76 percent — while exam results are usually quoted as straight percentages of a total. For those, the marks percentage calculator converts obtained over total on 1100 and other board totals, and the percentage calculator covers the rest.