Percentage Calculator
Compare two values, apply percentage increases or decreases with compounding, and reverse-calculate wholes from known parts—all in a single, shareable summary.
Compare two values
Understand relative size, percentage difference, and the absolute gap.
Quick comparison
Comparison results
80 vs 120
66.67%
How large Value A is relative to Value B
Difference
-40
-33.33% relative to Value B
Increase from smaller to larger
50.00%
How much the smaller number grows to reach the larger
Category
Value A is lower
Based on absolute comparison
Apply a percentage
Instantly calculate increases, decreases, and compound growth.
Adjustments
Useful for monthly growth, yearly returns, or repeated discounts.
Adjustment results
Amount change
18
12% of 150
Increase
168
Base plus the rate
Decrease
132
Base minus the rate
3× compounded
210.7392
Repeatedly apply the rate
| Period | Value |
|---|---|
| 1 | 168 |
| 2 | 188.16 |
| 3 | 210.7392 |
Reverse lookup
Work out the original whole when you only know a part and its percentage.
Find the whole
Reverse lookup results
Whole value
300
45 is 15% of this
Percentage check
15.00%
Consistency check rounding to two decimals
Remainder
255
What's left after removing the known part