# PercentEase: en page directory

- [About — PercentEase](https://percentease.com/en/about/): Publisher: Kymata Labs LLC. Calculate percentages, split tips and check discounts with worked formulas and examples. Free tools, localized numbers and no sign-up.
- [AI & Developer Access | PercentEase](https://percentease.com/en/ai/): Discovery Files · Site Pages · Method and checked examples. Calculate percentages, split tips and check discounts with worked formulas and examples. Free tools, localized numbers and no sign-up.
- [Blog — PercentEase](https://percentease.com/en/blog/): Educational articles about percentages, math tips, and calculator guides from PercentEase.
- [Contact — PercentEase](https://percentease.com/en/contact/): Have a question, suggestion, or found a bug? We'd love to hear from you.
- [FAQ — PercentEase](https://percentease.com/en/faq/): Frequently asked questions about percentages and the PercentEase calculator. Get answers to common math questions.
- [How It Works — PercentEase](https://percentease.com/en/how-it-works/): Method and checked examples. Calculate percentages, split tips and check discounts with worked formulas and examples. Free tools, localized numbers and no sign-up.
- [Free Percentage Calculator — PercentEase](https://percentease.com/en/): Calculate percentages, split tips and check discounts with worked formulas and examples. Free tools, localized numbers and no sign-up.
- [Privacy Policy — PercentEase](https://percentease.com/en/privacy/): How PercentEase handles calculator inputs, optional analytics, browser preferences and hosting data.
- [Terms of Service — PercentEase](https://percentease.com/en/terms/): PercentEase terms of service. Educational use only, not professional advice.
- [Discount calculator — PercentEase](https://percentease.com/en/tools/discount/): Enter a price and discount to calculate your savings and final price.
- [Free Online Tools by Kymata Labs](https://percentease.com/en/tools/): Explore all free tools by Kymata Labs LLC. Privacy-first calculators and utilities.
- [Tip calculator — PercentEase](https://percentease.com/en/tools/tip/): Calculate a tip and split the bill between any number of people.
- [What is a Percentage? A Complete Guide](https://percentease.com/en/blog/what-is-percentage/): Learn what percentages are, how they work, and how to calculate them with practical examples from everyday life.
- [Percentage Change Formula Explained](https://percentease.com/en/blog/percentage-change-formula/): Master the percentage change formula with step-by-step examples, common pitfalls to avoid, and real-world applications.
- [Everyday Percentage Tips and Tricks](https://percentease.com/en/blog/everyday-percentage-tips/): Practical percentage shortcuts for shopping discounts, tipping, budgeting, cooking adjustments, and more real-world scenarios.
- [Percentage increases and decreases: apply and compare changes](https://percentease.com/en/blog/percentage-increase-decrease/): To change an amount B by p%, multiply B by 1 + p/100 for an increase or 1 − p/100 for a decrease.
- [Percentage Calculator for Shopping: How to Calculate Discounts](https://percentease.com/en/blog/percentage-discount-calculator/): For original price P and discount d, savings are P × d / 100 and the final price is P minus those savings.
- [How to Calculate Tips Using Percentages](https://percentease.com/en/blog/tip-calculator-percentages/): Choose the bill amount B, your own tip rate r and a whole number of people n.
- [Interest percentages: simple interest, compounding and annual rates](https://percentease.com/en/blog/percentage-interest-rates-finance/): For simple interest, I = P × r × t, where r is the annual rate as a decimal and t is years.
- [How to Calculate Tax Percentages](https://percentease.com/en/blog/tax-percentage-calculator/): If a single known rate r applies to the whole taxable amount B, tax = B × r / 100 and total = B × (1 + r / 100).
- [Percentages in statistics: counts, weighted rates and percentage points](https://percentease.com/en/blog/percentage-statistics-data/): A percentage needs a numerator and a defined denominator: part ÷ whole × 100.
- [Convert fractions, decimals and percentages in all six directions](https://percentease.com/en/blog/fractions-decimals-percentages-conversion/): A fraction a/b becomes a decimal by dividing a by b, and a percentage by multiplying that ratio by 100.
- [Reverse percentages: find the original price before a discount](https://percentease.com/en/blog/reverse-percentage-original-price/): Work backward from a sale price or an increased amount, with checks for stacked discounts and a 100% reduction.
- [Margin vs markup: why a 30% markup is not a 30% margin](https://percentease.com/en/blog/margin-vs-markup/): Use the right denominator, convert between the two percentages, and check a selling price against a target gross margin.