Chem tools

Concentration Converter

Convert molarity, molality, wt%, vol%, and ppm with explicit assumptions. Enter density and molar mass only when needed, choose the ppm basis, and batch-convert pasted rows.

Chemical Unit Converter

Convert common pressure, temperature, concentration (ppm↔mg/L), viscosity (cP↔mPa·s), and volume units in one place. Includes approximate and precise modes, formulas, copy actions, local history, and shareable URLs.

Dilution Calculator

Calculate stock and diluent volumes with C1V1=C2V2. Build serial-dilution tables from step counts and factors, switch between µL/mL/L, copy results, and review rounding suggestions.

Density Calculator

Convert mass and volume using density. Supports units such as kg/L, g/mL, and lb/gal(US). Optional coefficient-based temperature correction, formula display, copy actions, and batch paste are included.

Stoichiometry Calculator

Calculate limiting reagent, excess amount, theoretical yield, and percent yield from reaction coefficients and g, mol, or solution M × L inputs. Coefficients are entered explicitly rather than balanced automatically.

Solution Recipe Calculator

Calculate required amounts in g and mL from the target concentration and final volume. Supports purity correction, multi-component recipes, x2/x10 scaling, print, CSV export, and shareable URLs.

Batch Scale-Up Calculator

Scale a batch while preserving formulation ratios. Adjust for loss and yield, round to a minimum charge increment, review deltas, and export the result as CSV or JSON with browser-only save.

Measurement uncertainty calculator

Estimate concentration and dilution uncertainty from weighing error, volume error, and related inputs. Convert tolerance notation to standard uncertainty, choose a coverage factor such as k=2, review main contributors, and copy report-ready output.

Molecular Weight Calculator

Enter a chemical formula such as C6H12O6 to calculate molar mass and elemental mass composition. Supports parentheses and hydrates such as CuSO4·5H2O, plus copy, CSV, and shareable URLs.

Significant Figures and Rounding Checker

Suggest reporting precision and notation from measured values, resolution, standard deviation, and rounding rules, with LOD/LOQ options, presets, history, copy actions, and shareable URLs.

pH / pOH Calculator

Convert H+, pH, and pOH with a simple calculator for education and field notes, including formulas and practical cautions.

Formulation Ratio Calculator

Build formulation tables from weight or volume ratios, scale to a target total, check min/max tolerances, handle density conversion and rounding, and export the result as CSV, TSV, or PDF.