Blend Two Strengths to a Target
Where the target sits between the strong and weak stock sets the ratio. Divide the target’s distance from the weak stock by the gap between the two, and that is the share of the strong one.
Your numbers
Amount of A
280mL
Amount of B
720mL
Concentration
12%
What it means
The target lies between the two stocks, so this mix works.
Formula
Amount of A = Volume (mL) × (Target % − B share) ÷ (A share − B share)
If the target is not between the two, no mix reaches it. You cannot make 35% out of 30% and 5% — you need a stronger stock.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Volume (mL) (mL)Volume in millilitres. | 1,000 | 0 and up |
| A share (%)The percentage that applies to the first item. | 30 | 0 ~ 100 |
| B share (%)The percentage that applies to the second item. | 5 | 0 ~ 100 |
| Target % (%)The concentration you want; lower means add water, higher means add solute. | 12 | 0 ~ 100 |
Step by step
Quick reference table
Results when only Volume (mL) (mL) changes and everything else stays put.
| Volume (mL) (mL) | Amount of A (mL) | Amount of B (mL) | Concentration (%) |
|---|---|---|---|
| 500 | 140 | 360 | 12 |
| 750 | 210 | 540 | 12 |
| 1,000 | 280 | 720 | 12 |
| 1,500 | 420 | 1,080 | 12 |
| 2,000 | 560 | 1,440 | 12 |
What each result means
| Result | At default values |
|---|---|
| Amount of A (mL)How much of the stronger liquid to use. | 280 |
| Amount of B (mL)How much of the weaker liquid to use. | 720 |
| Concentration (%)How much of the whole is solute. | 12 |
Common mistakes
If the target is not between the two, no mix reaches it. You cannot make 35% out of 30% and 5% — you need a stronger stock.
Glossary
- Volume (mL)
- Volume in millilitres.
- A share
- The percentage that applies to the first item.
- B share
- The percentage that applies to the second item.
- Target %
- The concentration you want; lower means add water, higher means add solute.
- Amount of A
- How much of the stronger liquid to use.
- Amount of B
- How much of the weaker liquid to use.
- Concentration
- How much of the whole is solute.
Frequently asked questions
Q. How is Blend Two Strengths to a Target calculated?
Amount of A = Volume (mL) × (Target % − B share) ÷ (A share − B share) — Where the target sits between the strong and weak stock sets the ratio. Divide the target’s distance from the weak stock by the gap between the two, and that is the share of the strong one.
Q. Can you walk through an example?
With Volume (mL) 1,000mL, A share 30%, B share 5%, Target % 12%, the answer is Amount of A 280mL.
Q. What do I need to enter?
Enter Volume (mL), A share, B share, Target %. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Volume (mL) (mL) moves the answer to Volume (mL) (mL) 500 → Amount of A (mL) 140 and Volume (mL) (mL) 2,000 → Amount of A (mL) 560. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
If the target is not between the two, no mix reaches it. You cannot make 35% out of 30% and 5% — you need a stronger stock.
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