How do I calculate VAT (Value Added Tax) in Cambodia?

Cambodia's standard VAT rate is 10%. Use Mode 1: enter 10 as the percentage and the pre-tax price as the number. The result is the VAT amount; add it to the original price for the total.

What is the formula for percentage increase?

Percentage Increase = ((New Value − Old Value) / Old Value) × 100. For example, if revenue grew from $800 to $1,000, the increase is ((1000-800)/800) × 100 = 25%.

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Percentage Calculator

A multi-mode percentage calculator: find what X% of Y is, what percentage X is of Y, and percentage increase or decrease between two numbers.

1. What is X% of Y?

of=

Formula: (15 / 100) × 200 = 30

2. X is what percentage of Y?

is what % of=

25.00%

Formula: (30 / 120) × 100 = 25.00%

3. Percentage Increase or Decrease

From

25.00%

Increase

Formula: ((100 - 80) / 80) × 100 = 25.00%

About & How It Works

Technical calculation logic, standards, and operational details

The Percentage Calculator provides three distinct mathematical operation modes covering the full spectrum of practical percentage computations. Mode 1 computes what a specified percentage of a given number equals (e.g., "What is 15% of 250?"). Mode 2 determines what percentage one number represents of another (e.g., "45 is what percent of 180?"). Mode 3 calculates the relative percentage increase or decrease between two values — the core formula used in financial reporting, discount pricing, population growth analysis, and academic score comparisons. All three modes display the formula applied alongside the result, enabling transparent mathematical verification.

Algorithmic Logic & Calculation

Each calculation mode applies its own algebraic formula. Mode 1: Result = (Percentage / 100) × Number. Mode 2: Percentage = (Part / Whole) × 100. Mode 3: Change % = ((New Value − Old Value) / |Old Value|) × 100. The engine validates inputs for division-by-zero and negative denominators, presenting error messages with mathematical context. Results are rounded to two decimal places consistent with standard financial rounding conventions.

Technical Standards & Compliance

Percentage calculations follow standard algebraic conventions. Rounding complies with ASTM E29 and common financial rounding to 2 decimal places.

Key Features & Capabilities

Three Calculation Modes

What is X% of Y? / X is what % of Y? / Percentage change between two values.

Formula Transparency

Every result shows the exact formula used so you can verify and learn the calculation process.

Negative & Decrease Detection

Clearly labels negative percentage changes as decreases with red visual indicators.

Zero & Edge-Case Validation

Detects division-by-zero scenarios and invalid inputs before calculation.

Practical Real-World Use Cases

Retail Discount & Sale Price

Shoppers and merchants calculate final prices after applying 10%, 20%, or 30% discounts during Cambodian sales events.

Academic Grade & Score Analysis

Students convert raw exam marks (e.g., 78/100) to percentage scores and determine grade thresholds.

Business Revenue Growth Reporting

Accountants compute quarterly revenue percentage growth or decline for investor reports and tax filings.

How to Use

Select the calculation mode you need.
Enter the values in the input fields.
Get immediate step-by-step results.

In-Depth Educational Guide

Complete Guide to Cambodian Riel (KHR) & Khmer Numerals

An in-depth guide exploring the historical origins of Khmer numerals (០-៩), linguistic counting structures, official National Bank of Cambodia formatting rules, and invoice word spelling.

Read Full Guide