About This Dilution Tool
This calculator helps chemists plan common dilution work. It is useful for reference standards, stains, buffers, acids, bases, and biological reagents. The layout keeps the workflow in one place. Enter a stock concentration. Enter the target concentration. Then choose the final prepared volume. The tool estimates the stock volume and the diluent volume.
Why Accurate Dilution Matters
Small errors can change an assay result. A wrong unit can also waste reagent. This page converts many concentration and volume units before the main calculation. It can compare molar units with mass units when molecular weight is supplied. Purity can be included when a stock is prepared from weighed material. Overage helps cover pipette loss and dead volume.
Formula Used
The main dilution equation is C1 × V1 = C2 × V2. C1 is the stock concentration. V1 is the stock volume needed. C2 is the desired working concentration. V2 is the final working volume. The calculator solves V1 as C2 × V2 ÷ C1. The diluent volume is V2 minus V1. Dilution factor is C1 ÷ C2. A serial plan divides the total factor across selected steps.
How To Use This Calculator
Choose the calculation mode first. Use direct dilution when a stock concentration is already known. Use weighed stock mode when you know mass, molecular weight, purity, and final stock volume. Use serial mode when the target is far below the stock. Keep units consistent when possible. Add molecular weight when switching between molar and mass concentration units. Press calculate to review results above the form. Then export the table for lab notes.
Good Laboratory Practice
Use calibrated pipettes for small transfers. Avoid transfer volumes below your reliable pipette range. Mix each tube fully before moving to the next serial step. Label tubes with concentration, date, solvent, and preparer. Treat vendor names as reagent identifiers only. Always follow your lab safety rules and product data sheet.
Example Interpretation
If the tool reports 100 microliters of stock and 900 microliters of diluent, the final tube contains one milliliter. The dilution factor is ten. That means one part stock and nine parts diluent. Repeat this carefully for serial work. Record temperature when sensitive reagents require handling during preparation. Recheck labels before storage or use.