Rozcienczen Calculator
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Dilution Calculator
A professional tool for precise preparation of laboratory and technical solutions.
Enter your data and click calculate to generate the solution recipe.
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Other tools you may find usefulDilution calculator: calculate V1 and solvent for a solution with a given concentration
You have a concentrate with a concentration ofC1and you want to obtain a solution with a concentration ofC2in the final volumeV2? This calculator shows exactly how much concentrate to measure (V1) and how much solvent to add (Vd), and additionally shows thedilution factor (DF), the1:x ratio, concentration reduction and quick batch scalingx5andx10.
The tool is useful in the laboratory (chemistry, biology, microbiology), in technology (cleaning agents, coolants, process additives), as well as in everyday practice - wherever you need to quickly and error-free dilution with concentrate to a specific volume.
You enter C1, C2 and V2- you get V1 and Vd without manual counting and without mistakes in units.
Support forµL / mL / Land any concentration units (%, mg/mL, g/L, mol/L) - consistency of C1 and C2 is important.
DF, proportion1:x, concentration reduction and scaling for larger batches (x5 / x10).
What does the dilution calculator calculate?
- V1– volume of concentrate you need to measure.
- Vd– volume of solvent to be added (V2 − V1).
- DF (Dilution Factor)– how many times you dilute (DF = C1/C2).
- Proportion 1:x– clear concentrate: solvent ratio.
- Concentration reduction– by what percentage the concentration decreases from C1 to C2.
- Scaling– how much V1 is needed for batches of x5 and x10.
When is this useful?
- Preparation of working solutions from concentrates (e.g. buffers, reagents).
- Dilution for testing, quality control, calibration and standard curves.
- Selection of proportions for cleaning products and technical preparations (concentrate → solution).
- Large batch production: quick x5/x10 conversion without recounting.
If you count often, the calculator saves time and reduces the risk of error (especially with µL and small volumes).
How to use the calculator? (step by step)
- Enter the initial concentration of C1(concentrate).
- Enter the final C2 concentration(target).
- Select the concentration unit(e.g. %, mg/mL, g/L, mol/L) - C1 and C2 must be in the same unit.
- Enter the V2 target volumeand unit (µL / mL / L).
- Setprecision(decimal places), clickCALCULATE.
The formula behind the calculations (C1V1 = C2V2)
In classical dilution, the amount of solute is assumed to be conserved:C1 × V1 = C2 × V2. Hence:V1 = (C2 × V2) / C1.
The calculator also calculates the solvent:Vd = V2 − V1, and the dilution factor:DF = C1 / C2.
Thanks to DF, you can immediately see the scale: DF = 10 means dilution10×(i.e. 1 part of concentrate to 9 parts of solvent assuming a volumetric approach).
How to understand DF and the 1:x ratio?
DF (Dilution Factor)
DF tells you how many times the concentration decreases. Example: from 10% to 1% → DF = 10. This is convenient for series of dilutions or when comparing recipes.
- DF = 2 → concentration is halved.
- DF = 10 → the concentration decreases by a factor of 10.
- DF = 100 → very high dilution (often better in stages).
Proportion 1:x
The proportion 1:x in the calculator shows the relationship:concentrate : solvent. For DF=10, the result is typically ~1:9 (because you fill up to V2).
This is practical for mixing "by eye" on a larger scale, but for precise work, always stick to V1 and padding to V2.
Common dilution errors (and how to avoid them)
- Inconsistent concentration units– C1 and C2 must be in the same unit (e.g. % and %).
- Confusing µL and mL– 1000 µL = 1 mL. The calculator helps, but the pipette is not forgiving.
- Rounding too early- set higher precision and round only at the end.
- Adding "to volume"- the correct technique is: measure V1, add part of the solvent, mix andmake up to V2.
- Very large DF in one step- consider dilutions in stages (e.g. 1000× as 10× → 10× → 10×).
FAQ
Can I mix different concentration units (e.g. % and mg/mL)?
Not directly. The calculator assumes that C1 and C2 are in the same unit. If you want to switch between % and mg/mL, you need additional data (e.g. solution density, definition of % m/m or m/v).
Why does the calculator display an error when C1 ≤ C2?
Because it is not dilution, but thickening or no change. When diluted, the concentrate has a higher concentration than the target solution. If you want to increase the concentration, there are methods other than adding solvent.
What does "concentration reduction" mean in %?
This is information by how much the concentration has decreased compared to C1. Example: from 10 to 1 is a 90% reduction. This is a quick indicator of "how much" you are diluting.
What is the best way to prepare a solution in a volumetric flask?
Measure V1 of the concentrate, pour into the flask, add solvent to approximately 80-90% of the volume, mix, and thenfill up to the V2 line. This usually gives the best repeatability.
If you do dilutions regularly, use this calculator as a "quick recipe". Just change C1, C2 and V2 and the tool will instantly show V1, Vd, DF and aspect ratio - no manual counting required.
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