ChemEs Calculator
Practical Calculators for Modern Chemistry.
Molarity Calculator
Find mass, volume, concentration and stock dilutions.
Open toolSolution Preparation
Prepare solutions with purity correction and weighing guidance.
Open toolMoles ↔ Grams
Convert between mass and amount with explicit units.
Open toolReaction Stoichiometry
Plan equivalents, limiting reagents and isolated yields.
Open toolGlassware Guide
Explore 26 illustrated pieces of laboratory glassware.
Open toolLaboratory Setups
Review six annotated laboratory arrangements.
Open toolFree to use. Calculations stay on your device.
GET THE CONCENTRATION RIGHT
Solution preparation & dilution
Use the molecular weight of the actual salt, hydrate or solvate supplied.
Select a reference match to fill formula and MW, or enter your own values.
About ChemEs Calculator
A browser-based chemistry workbench for researchers and students. ChemEs Calculator is a provisional brand pending domain and trademark checks.
Methodology
Calculations use explicit units and supplied stoichiometric coefficients. Molecular-weight catalogue records link to PubChem; HRMS uses monoisotopic masses and stated ion corrections. Educational diagrams are original schematics, not manufacturer drawings or operating procedures. Automated tests check arithmetic and software behavior, not universal scientific correctness.
Privacy
Normal calculations, searches and formatting run locally. Experimental data are not sent to a server. Only your theme preference is saved in localStorage; calculation inputs stay in memory during the session and reset on reload. Following an external reference link connects to that external site. The installed app caches static files and a release-check timestamp for offline access, never experimental inputs. The hosting provider receives ordinary connection information, such as IP addresses and requested file paths. No analytics or tracking scripts are included.
Beta limitations
Independently verify results before experimental or publication use. Diagrams are educational references and do not replace training, equipment manuals or approved SOPs. Offline launches expire after seven days without a verified release check. An already open session is not forcibly closed; reconnect and check for updates regularly.
Contact
A public contact channel has not yet been configured. No affiliation or certification is claimed.
How it works
For preparation from a solid, choose the molecular weight of the actual salt or hydrate. If purity is supplied, divide the pure-solute mass by the purity fraction. For stock dilution, measure stock solution and dilute to the final volume, rather than adding that full volume of solvent.
Formula: m = C × V × MW / p, where p is purity as a fraction (0 < p ≤ 1). For dilution, V₁ = C₂V₂ / C₁ with consistent concentration and volume units.
Worked example: Dilute a 1 M stock to 100 mM in 100 mL: V₁ = (0.100 M × 100 mL) / 1 M = 10 mL stock. Dilute to 100 mL total solution. This simple dilution requires target concentration no greater than stock concentration.
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