Scenario 1
Tip on a restaurant bill
15% tip on a $85 bill → $12.75 tip, $97.75 total.
Trusted by freelancers and business owners
Percentage Calculator
Stop second-guessing percentages — get the right number instantly.
Adjust your inputs
Results update instantly as you type or drag.
0 – 100,000,000
The whole amount or original value
0 – 10,000
%
The percentage rate to apply
Quick insights
Remainder
170
Portion is % of base
15%
Quick answer
How do you calculate a percentage?
To find X% of Y: multiply Y by X/100. To find what percent X is of Y: divide X by Y and multiply by 100. To find percentage change: (New − Old) / Old × 100.
How it works
From inputs to result in four steps
A quick walkthrough of what this calculator does behind the scenes.
- 1
Enter the base value (the whole amount).
- 2
Enter the percentage you want to apply.
- 3
See the portion, what percent it represents, and the change from base.
- 4
Useful for tips, tax, VAT, commission, markups, and score comparisons.
Formula
The math behind the number
No black box — here's exactly how the result is computed.
Portion = Base × (Rate ÷ 100) Rate % = (Portion ÷ Base) × 100
A percentage is just a fraction expressed out of 100. Multiply or divide by 100 to switch between the two forms.
Examples
Real-world scenarios
See how the numbers play out for typical use cases.
Scenario 2
Commission on a sale
8% commission on a $4,500 deal → $360 commission earned.
Scenario 3
Revenue growth
Revenue grew from $80,000 to $100,000 → 25% increase.
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