How This Calculator Works
Ratio turns the inputs into a visible formula-based estimate. Use the result as a planning check, then compare a lower, expected, and higher scenario when the input values are uncertain.
Use the ratio calculator to simplify two-part ratios, scale ratios by a factor, divide a total by a ratio, and compare ratios with percentages.
Ratios compare parts. Simplifying divides every part by the same common divisor, while scaling multiplies every part by the same factor.
Formula
Simplified ratio = A/gcd(A,B) : B/gcd(A,B). Split A = total x A / (A + B).
Example Calculation
12:18 simplifies to 2:3. A total of 150 split 2:3 gives 60 and 90.
When to Use This Calculator
- Simplify recipe proportions
- Split a total by parts
- Convert a ratio into percentages
Practical Scenarios
- Use the calculator before a decision depends on the number, then write down the inputs that would be easiest to verify. Use case: Simplify recipe proportions.
- Rerun the estimate when the most uncertain input changes, so the result shows a useful range instead of one brittle answer. Start with Ratio, then compare the changed result with the original.
- Use the related calculators when the result affects a wider cost, schedule, or planning workflow. This is especially useful when you need to convert a ratio into percentages.
Tips
- Use the same unit for both ratio values
- Keep both parts non-negative
- Scale every part by the same factor
Common Mistakes
- Scaling only one side
- Comparing values with different units
- Treating A:B as A divided by B only
- Using one unusually good input as if it were the normal case.
- Mixing units, time periods, or assumptions from different scenarios.
Assumptions and Limitations
The Ratio Calculator is most useful when every input belongs to the same real-world scenario, unit, and time period. Review the formula, assumptions, and related calculators before using the result in a decision.
- Local rules, fees, availability, timing, and real-world conditions can change the result.
- The result is an estimate and should be checked before making an important decision.
- Use realistic low, expected, and high scenarios when uncertainty matters.
Ratio uses ratio, simplify ratio, scale ratio and split total as the main context for the formula, example, and assumptions.