Instant Ratio & Proportion Solutions
Professional-grade calculator with visual feedback, smart validation, and step-by-step solutions. Perfect for students, engineers, chefs, and professionals.
Ratio Calculator
Solve proportions, simplify ratios, compare values, and scale measurements
Calculation Result
How It Works
Simple 3-step process to get accurate results every time.
Choose Mode
Select from proportion solver, simplify, compare, or scale based on your needs.
Enter Values
Input your numbers. Mark the unknown with X for proportion solving.
Get Results
Instant calculation with formula breakdown and visual comparison.
All Calculator Categories
Professional tools for every field and use case.
Mathematics
Academic & advanced calculations
Finance
Financial ratios & business metrics
Health
Body ratios & health calculations
Engineering
Precision scaling & measurements
Media & Design
Aspect ratios for images & video
Automotive
Gear ratios & performance metrics
Business
ROI, profit margins & more
Science
Lab calculations & conversions
Education
Learning tools & step-by-step
Daily Life
Recipes, maps & everyday ratios
Why Choose Ratio Calculator.org?
Powerful features designed for accuracy, speed, and ease of use.
Military-Grade Precision
Handles floating-point calculations with extreme accuracy. Supports 15+ decimal places.
Lightning Fast
Zero dependencies. Calculations complete in under 1 millisecond. Instant visual feedback.
Bank-Level Privacy
100% client-side processing. Your data never leaves your device. No tracking, no cookies.
4 Calculation Modes
Proportions, simplification, comparison, and scaling. All in one tool.
Smart Validation
Detects division by zero, invalid inputs, and provides clear error messages.
Export Results
Copy formulas, screenshot results, or share calculations with one click.
What Our Users Say
Trusted by thousands of professionals worldwide.
Frequently Asked Questions
A ratio compares two quantities showing their relative sizes. For example, 3:5 means 3 parts to 5 parts. Ratios can represent fractions, proportions, or rates, and are fundamental in mathematics, science, finance, and everyday applications.
Uses 15+ decimal precision with IEEE 754 floating-point arithmetic for perfect accuracy. All calculations are performed client-side with JavaScript’s native Math functions, ensuring consistent results across all devices.
Yes! Full support for decimal numbers, fractions converted to decimals (e.g., 0.5 for 1/2), and negative values in all modes. You can enter values like 3.14, -2.5, or 0.333 for precise calculations.
100% client-side processing. Nothing is sent to servers. Your calculations remain entirely on your device – we have no access to your data. Works offline without internet connection and includes no tracking or analytics.
Cross multiply: A×D = B×C, then solve for the unknown. For example, if 3:5 = x:15, then 3×15 = 5×x, so x = (3×15)÷5 = 9. Our calculator does this automatically – just mark the unknown value with X.
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