Quickly and easily calculate the unknown value X using the Rule of Three.
Example 1 (Directly proportional):
If 10 apples cost 5 Euros, how much do 20 apples cost?
Input: Value A = 10, Value B = 5, Value C = 20.
Calculation process: X = (B × C) / A = (5 × 20) / 10 = 10
Select 'Directly proportional'.
Result: X = 10.00 Euros.
Example 2 (Inversely proportional):
If 5 workers need 10 hours for a task, how many hours do 2 workers need for the same task?
Input: Value A = 5, Value B = 10, Value C = 2.
Calculation process: X = (A × B) / C = (5 × 10) / 2 = 25
Select 'Inversely proportional'.
Result: X = 25.00 Hours.
Note: Make sure to enter the correct values for A, B, and C and choose the appropriate proportionality type.
A Rule of Three Calculator is an online tool that helps you quickly and easily calculate the unknown value in a proportion. Whether you want to perform a rule of three calculation with direct or inverse proportionality, this calculator will support you. It is a useful rule of three calculator for school, studies, or everyday life to solve complex rule of three problems. You can also calculate the rule of three online.
When calculating the rule of three, it is important to understand the type of proportionality. With direct proportionality, both quantities increase proportionally (e.g., more apples, higher price). A classic rule of three calculator would calculate X = (B * C) / A here. With inverse proportionality, one quantity decreases when the other increases (e.g., more workers, less time). For the inverse rule of three, X = (A * B) / C is calculated. Our rule of three calculator helps you master both cases.
Enter the three known values (A, B, and either C or X) into the corresponding fields. The rule of three calculator automatically detects which value you want to calculate. Then select the correct proportionality type (direct or inverse). Click 'Calculate' to get your result. This rule of three calculator also provides you with a calculation method and examples to better understand the rule of three calculation process. This way, you can quickly calculate the rule of three online and get a precise rule of three formula.
Yes, you can also solve rule of three percentage problems with this calculator. Many percentage calculations are based on the principle of the rule of three. Whether it's about 'rule of three percent calculation' or 'rule of three percent calculator', our versatile rule of three calculator can help you determine the percentage or the base value. If you want to know how to calculate the rule of three for percentage problems, our rule of three calculator provides the appropriate rule of three formula.
This rule of three calculator focuses on the simple rule of three. For more complex cases like the compound rule of three calculator, this tool is primarily optimized for basic calculations. However, you can learn the basics of the rule of three and the rule of three formula here and apply them to more complex tasks. We have integrated examples for rule of three calculation with step-by-step solutions.