Scientific Tools

Dilution calculator free — solve C1V1=C2V2 for stock concentration, volumes, or final strength. Lab prep in your browser, no signup.

pH calculator free — find pH, pOH, and ion concentrations from [H⁺], [OH⁻], or strong acid/base molarity. Instant, no signup.

pOH calculator free — find pOH, pH, and [OH⁻] from hydroxide concentration or strong base molarity. Instant, no signup.

Buffer calculator free — Henderson-Hasselbalch pH for acid and base buffers. Solve pH, pKa, or concentrations. Instant, no signup.

Percent yield calculator free — find % yield, actual yield, or theoretical yield in grams or moles. Stoichiometry lab prep, no signup.

Charles' law calculator free — solve V1/T1=V2/T2 for volume or temperature at constant pressure. K, °C, L, mL. No signup.

Combined gas law calculator free — solve P1V1/T1=P2V2/T2 for any unknown. Pressure, volume, temperature units. No signup.

Reaction stoichiometry calculator free — moles and grams from a balanced equation and known amount. Auto-balance, no signup.

Electron configuration generator free — full and noble-gas notation for any element. Aufbau rules + exceptions. No signup.

Calculate radioactive decay with half-life — remaining amount, elapsed time, or half-life from N = N₀(½)^(t/t½). Free, instant, browser-based.

Convert chemical formulas to names and names to formulas — ionic compounds, acids, hydrates, and common molecules. Free, instant, browser-based.

Get the reverse complement of a DNA or RNA sequence — A↔T/U, G↔C with GC content and FASTA support. Free, instant, browser-based.