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.
Moles ↔ Grams
Convert between mass and amount using your molecular weight.
n = m / MW · n in mol, m in g, MW in g/mol.
Enter molecular weight and a positive quantity to calculate.
Load Example uses illustrative NaCl data (MW 58.44 g/mol).
m = n × MW · n in mol, m in g, MW in g/mol.
Enter molecular weight and a positive quantity to calculate.
Load Example uses illustrative NaCl data (MW 58.44 g/mol).
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
Molecular weight relates a compound’s mass to its amount of substance. Use the correct molecular weight for the chemical form; hydrates and salts may differ. A mass conversion alone does not describe a balanced chemical reaction.
Formula: n = m / MW; m = n × MW. With m in g and MW in g/mol, n is in mol. 1 mmol = 0.001 mol; 1 mg = 0.001 g.
Worked example: 584.4 mg NaCl = 0.5844 g. At MW 58.44 g/mol, n = 0.5844 / 58.44 = 0.01000 mol = 10.00 mmol.
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