Working Solution PPM Calculator
The stock bottle says 10,000 PPM; today's experiment needs 250 PPM in 200 mL. Pipette how much? This does the C1V1 math.
Calculator
Working Solution PPM Calculator
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The stock bottle says 10,000 PPM; today's experiment needs 250 PPM in 200 mL. Pipette how much? This does the C1V1 math.
How to use this calculator
- Enter stock PPM.
- Enter target PPM and volume.
- Get stock volume to pipette.
The formula
V_stock = C_target × V_final ÷ C_stock.
What the inputs mean
The target is the concentration you want, in PPM. The volume is how much liquid you are treating. The result tells you exactly how much product to add.
Worked example
10,000 PPM → 250 PPM in 200 mL: 250 × 200 ÷ 10,000 = 5 mL stock, bring to 200 mL.
Quick reference
| Stock | Target | Per 100 mL |
|---|---|---|
| 10,000 | 100 | 1 mL |
| 10,000 | 250 | 2.5 mL |
Bring to final volume after adding stock.
Where you will actually use this
Daily bench dilutions should take seconds, not scratch paper.
- Daily lab dilutions
- Assay prep
- Instrument calibration
Mistakes that give wrong answers
- Pipetting viscous stocks inaccurately
- Forgetting to mix after bringing to volume
Key takeaways
- Formula: Stock volume = Target × Volume ÷ Stock
- Remember: Bring to final volume after adding stock.
- Watch out for: Pipetting viscous stocks inaccurately
- Next step: run your own numbers in the calculator above, then verify with a measurement — calculated values are only as good as the inputs.
Frequently asked questions
Should I add stock to water or water to stock?
Add stock to most of the water, then bring to final volume.