About DilutionCalculator.org and its free laboratory calculation tools
DilutionCalculator.org is an independent collection of browser-based laboratory arithmetic tools. The project covers stock and serial dilution planning, molarity and mass concentration, reconstitution, percent solutions, and molecular-weight conversions between moles and mass.
The calculators are designed for transparent checking rather than black-box output. Every page names the equation, keeps units attached to values, explains the conversion sequence, and provides worked examples. The site does not sell laboratory products and is not affiliated with R&D Systems, Tocris Bioscience, or Bio-Techne.
How dilution calculator formulas and SI unit conversions are reviewed
Core calculations are implemented as shared pure functions and tested against representative examples. Tests cover single and serial dilution, reconstitution, molarity, all three percent definitions, bidirectional concentration conversion, and bidirectional moles-to-mass conversion.
Reviews cover dimensional consistency, SI prefix conversion, zero and negative input rejection, reverse calculations, and mode-specific quantity types. Interface output is checked separately on desktop and mobile so a correct formula is not hidden by a broken control or truncated unit label.
What free laboratory solution calculators cannot determine
Arithmetic cannot determine whether a chemical is soluble, stable, compatible, or safe in a selected solvent. The site does not account for purity correction, activity units, density, non-additive solution volumes, temperature-dependent volume, displacement, equipment uncertainty, or a product-specific preparation sequence unless those values are explicitly part of an equation.
Users remain responsible for verifying labels, certificates of analysis, safety data sheets, protocols, local requirements, equipment range, significant figures, and final-volume conventions. When a calculated value conflicts with an authoritative product instruction, stop and resolve the discrepancy before preparing the solution.
Which dilution, molarity, or solution preparation calculator should I use?
Choose a calculator by matching the known values and the quantity the worksheet or protocol asks you to find. Do not choose by unit alone: mg/mL can describe a reconstitution target or a mass concentration that must be converted to molarity, while mM can be part of either a dilution or molarity calculation.
Every calculator page identifies its equation, input definitions, supported units, worked example, and limitations. The complete directory groups the seven tools into dilution planning, solution preparation, and molecular conversion workflows.
- Browse all laboratory solution calculators: compare the seven tools by known values, output, and formula
- Review calculator formulas and methodology: inspect unit normalization, validation, and rounding rules
- Read the dilution calculator FAQ: resolve common questions about units, precision, privacy, and scope