Free Percentage Calculator: Solve Any Percentage Problem
What's 15% of 847? What percentage is 23 out of 180? If something went from 150 to 195, what's the percentage increase? A percentage calculator handles all of these instantly — and shows you the math so you actually understand the answer.
I'm decent at mental math, but percentages still trip me up when the numbers aren't round. This tool saves me from embarrassing mistakes.
The Three Percentage Problems Everyone Has
Most percentage questions fall into three categories:
- "What is X% of Y?" — like calculating a tip, discount, or tax. What's 20% of $85? That's $17.
- "X is what % of Y?" — figuring out proportions. You got 42 out of 50 on a test — that's 84%.
- "Percentage change from X to Y" — tracking increases or decreases. Price went from $50 to $65? That's a 30% increase.
The calculator handles all three. Pick the type, enter your numbers, get your answer with a step-by-step breakdown.
Real-Life Uses
Shopping: that jacket is 35% off from $120 — how much do you save? ($42, final price $78.)
Work: your team hit 87 out of 100 targets. What's your completion rate? (87%.)
Finances: your rent went from $1,400 to $1,540. What's the percentage increase? (10%. Ouch.)
School: you need 70% to pass and the exam has 65 questions. How many do you need right? (At least 46.)
Step-by-Step Explanations
This is what makes it better than just punching numbers into your phone's calculator. Every result comes with the formula and the calculation broken down. So if you're a student learning percentages, or you need to explain the math to someone else, you've got the full working right there.
For example: "What is 18% of 250?" shows you → 250 × (18/100) = 250 × 0.18 = 45. Simple when you see it laid out.
Percentage Increase vs Decrease
People mix these up all the time. A 50% increase followed by a 50% decrease does NOT get you back to the original number. If 100 increases by 50%, you get 150. If 150 decreases by 50%, you get 75. Not 100. The percentage change calculator handles the direction automatically so you don't have to worry about the formula.