Inputs
Adjust the assumptions to match your scenario. Results update instantly.
Results
Primary outputs and comparison insights are built from the current inputs.
Part A
300
Amount allocated to the first side of the ratio.
Part B
200
Amount allocated to the second side of the ratio.
A share
60%
Percentage share allocated to the first side of the ratio.
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How this calculator works
The Ratio Split Calculator divides a total into two parts using any ratio, which is useful for budgets, profit sharing, and weighted allocations. Enter ratio a, ratio b, and total amount to estimate part a, part b, and a share. The calculator updates instantly and adds a comparison table plus chart so you can test the sensitivity of the result before you use it in a decision.
Quick guide
Jump straight to the section you need, then return to the calculator.
Inputs
- First part of the ratio used in the allocation.
- Second part of the ratio used in the allocation.
- Total amount that will be divided by the selected ratio.
Outputs
- Amount allocated to the first side of the ratio.
- Amount allocated to the second side of the ratio.
- Percentage share allocated to the first side of the ratio.
Assumptions
- The ratio uses only two parts in this calculator.
- Both sides of the ratio are treated as non-negative shares.
Tips
- Simplify the ratio mentally if you want a quick sense check, but the result stays the same.
- Use this for budgets, inheritance planning, and any linear split problem.
Formula guide
Use these formulas to audit the output or explain it to someone else.
2 formulas
Usage examples
Review a ready-made scenario, copy it, then tweak inputs to match your case.
Example
Profit share allocation
Inputs
- Example input Ratio A: 5
- Example input Ratio B: 3
- Example input Total amount: 2,400
Outputs
- Example result Part A: 1,500
- Example result Part B: 900
- Example result A share: 62.5%
Ratio splits are useful because they turn a percentage-style agreement into exact amounts once the final total is known.
Split by total amount
| Total amount | Part A | Part B |
|---|---|---|
| 250 | 150 | 100 |
| 400 | 240 | 160 |
| 500 | 300 | 200 |
| 750 | 450 | 300 |
| 1,000 | 600 | 400 |
Ratio splits are linear, so the parts scale directly with the total amount while the ratio itself stays constant.
Part A as total grows
Focus point
250
150
Position
#1 of 5
Original order
Share of total
8.62%
Total: 1,740
Ratio splits are linear, so the parts scale directly with the total amount while the ratio itself stays constant.
References
- Ratio and proportion allocation formulas
- Weighted split calculations in basic math
FAQ
Common questions
What does the Ratio Split Calculator do?
The Ratio Split Calculator divides a total into two parts using any ratio, which is useful for budgets, profit sharing, and weighted allocations. Enter ratio a, ratio b, and total amount to estimate part a, part b, and a share. The calculator updates instantly and adds a comparison table plus chart so you can test the sensitivity of the result before you use it in a decision. It is part of our math toolkit.
What inputs do I need?
Typical inputs include First part of the ratio used in the allocation., Second part of the ratio used in the allocation., Total amount that will be divided by the selected ratio..
How are the results calculated?
We follow the formulas and assumptions outlined in the "How this calculator works" section. You will see outputs like Amount allocated to the first side of the ratio., Amount allocated to the second side of the ratio., Percentage share allocated to the first side of the ratio..
Can I share or download the results?
Use the Copy link or Print buttons to share your results. If a table or chart appears, you can download the data as CSV.
Is my data stored?
No. Calculations run in your browser and we do not store your inputs.
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