Use the Free Calculator
Try our free Percentage Calculator for instant results.
Open Calculator →Overview
Percentages appear in everything from tax calculations to exam scores to discount shopping. These five core calculations cover 95% of real-world uses.
The Formula
X% of Y = (X÷100)×Y | % change = ((new−old)÷old)×100 | X is what % of Y = (X÷Y)×100
Standard formula used by professionals worldwide
Worked Example
Step-by-step
15% tip on 3,000 = 450 | Score 78/90 = 86.7% | Price from 200 to 250 = 25% increase
Key Concepts
- Accuracy: Results are as accurate as the inputs you provide
- Units: Always use consistent units throughout your calculation
- Verification: Double-check important calculations before making decisions
- Professional advice: For major financial, health, or structural decisions, consult a qualified professional
Privacy and Security
- All calculations run entirely in your browser
- No data is sent to any server
- No sign-up or personal information required
- Your data stays private — always
Frequently Asked Questions
Quick tip calculation?
For 15%: 10% (move decimal) + half that = 5% → add them.
Percentage points vs percentage change?
From 10% to 12% is 2 percentage points but 20% relative change.
Find original from discounted price?
Original = Sale ÷ (1 − discount%). 80 after 20% off → 80÷0.8 = 100.