📐 Rule of Three Calculator: Your Math Ally
Solve for any unknown in seconds with our Online Rule of Three Calculator. Whether you need to crack a simple direct proportionality problem (like adjusting recipe ingredients) or a complex inverse scenario, this tool gives you the solution and, most importantly, explains how to get there.
🚀 When to use the Rule of Three?
- Cooking & Recipes: If 4 eggs serve 2 people, how many do I need for 5? (Direct)
- Travel & Speed: If I travel 2 hours at 100km/h, how long will it take at 120km/h? (Inverse)
- Currency & Exchange: If 100 Dollars are 90 Euros, how many Euros are 50 Dollars? (Direct)
- Construction & Labor: If 5 workers build a wall in 10 days, how long will 10 workers take? (Inverse)
✅ Why our calculator stands out
- 🔢 Smart Dual Mode: Supports both Simple (Direct & Inverse) and Compound Rule of Three.
- 🔢 Step-by-Step Explanation: It doesn't just give you the number; it shows the formula and logical substitution.
- 🔢 Visual & Intuitive: The arrow design helps you visualize the relationship between variables A, B, and C.
- 🔢 Unlimited Compound Calc: Solve complex problems with multiple simultaneous variables.
🛠️ Quick Start Guide
- Choose mode: 'Simple' for 3 known values, or 'Compound' for more variables.
- Select the relation type using the arrow buttons (Direct ↗️ or Inverse ↙️).
- Enter your known values in boxes A, B, and C.
- Click 'Calculate' to see the result along with the full mathematical breakdown.
🤓 Direct vs Inverse: The Trick
The key lies in asking a simple question: 'If this quantity goes up, should the other one go up or down?'.
If both go up together (more gas = more distance), it's Direct.
If one goes up and the other down (more speed = less time), it's Inverse.