Calculate percentages, discounts, tips, tax markups, and percentage increase or decrease with step-by-step mathematical breakdowns in plain English. 100% private.
15% of 80 is 12
To find 15% of 80, divide 15 by 100 (0.1500) and multiply by 80.
Solve everyday percentage calculations instantly. From calculating restaurant tips and store discounts to measuring business growth and sales tax, get clear step-by-step math formulas in plain English.
Fast and easy from start to finish
Select the calculation tab matching your problem (e.g. 'What is X% of Y?').
Enter your numbers into the input boxes.
Review the calculated value, visual progress fill, and step-by-step mathematical explanation.
Click 'Copy Result' to copy the calculated value and formula breakdown.
What you can do with this tool
4 Everyday Modes: What is X% of Y, X is what percent of Y, Percentage Increase/Decrease, and Add/Subtract percentage.
Step-by-Step Explanations: Plain English mathematical formulas explain the exact math behind every answer.
Visual Proportion Bar: Dynamic percentage bar provides instant visual intuition for proportions.
Adjustable Precision: Switch between 0, 1, 2, or 4 decimal places with one click.
Real-World Presets: Fast 1-click presets for dining tips, store sales, tax markups, and revenue growth.
Unlock batch scale, higher resolution, and expanded limits
Calculate tax, tips, and discounts across entire inventory lists at once.
Calculate stacked discounts (e.g., 20% off plus extra 15% coupon plus tax).
Export clean PDF receipts with itemized step-by-step math explanations.
Everyday walkthroughs and starter ideas for Percentage Calculator
Find 18% tip on an $85 dinner bill ($15.30 tip, $100.30 total).
Calculate 30% discount on a $120 jacket ($36 discount, $84 final price).
File requirements, capabilities, and system limits
Division by zero is automatically guarded against and returns 0%.
Helpful definitions of features and parameters
A number or ratio expressed as a fraction of 100, symbolized by the '%' sign.
The degree of change over time, showing what percentage an initial value has grown or decreased.
How creators, students, and professionals use Percentage Calculator
Calculating restaurant tips quickly on mobile devices
Finding final prices during shopping sales and seasonal retail promotions
Computing sales tax, VAT, or GST markups on business invoices
Measuring month-over-month revenue, follower, or traffic growth percentages
Answers to common questions about Percentage Calculator
Subtract the starting number from the final number, divide that difference by the starting number, and multiply by 100.
Use the 'Add or Subtract %' tab: enter the original price, select Subtract, and enter the discount percentage to get the final price and money saved.
Popular companion tools to edit and enhance your projects