Chemistry 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 chemical units for pressure, temperature, concentration (ppm↔mg/L), viscosity (cP↔mPa·s), and volume on one screen. Includes approximate/precise modes, formulas, copy actions, local history, and shareable URLs.

Dilution Calculator

Calculate stock and solvent volumes with C1V1=C2V2 from stock concentration, target concentration, and final volume. Generate serial dilution tables from step count and factors, with uL/mL/L switching, copy buttons, and 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 input quantities in g, mol, or solution M×L. The page uses user-entered coefficients instead of automatic balancing.

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 k factors such as k=2, review the main contributors, and copy a report-ready output.

Molecular Weight Calculator

Enter a chemical formula such as C6H12O6 to calculate molar mass and elemental composition by mass. 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. Includes LOD/LOQ reporting options, copy actions, presets, history, and shareable URLs.

pH / pOH Calculator

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