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Calculate protein concentration from A280 absorbance using an extinction coefficient, path length, dilution factor, and molecular mass.

A collection of common lab buffer and solution recipes — TE, TAE, TBE, PBS, TBS, TBST, SSC, SSPE, HEPES, and more — with concentrations and preparation steps.

Reverse, complement, or reverse-complement DNA and RNA sequences for PCR primers, cloning, and sequence analysis.

Clean, validate, reformat, convert, and print DNA, RNA, protein, and multi-FASTA sequences privately in your browser.

Convert DNA or RNA mass, moles, and molecule count using sequence composition or a length-based estimate.

Convert between protein mass concentration and molar concentration, or between protein mass, moles, and molecule count.

Calculate protein pI, molecular weight, charge, amino acid percentages, aromaticity, GRAVY, and A280 extinction coefficients.

Fit a BCA, Bradford, or Lowry protein assay standard curve with blank correction, replicate means, and unknown-sample interpolation.

Calculate initial and final stock concentrations and volumes using the C1V1 = C2V2 dilution formula. Free, instant client-side chemistry tool.

Determine how much diluent to add to lower an existing solution to a target concentration without wasting stock.

Calculate stock aliquot and diluent volume required to reach an exact final volume at a specific target concentration.

Calculate buffer pH, the required conjugate base-to-acid ratio, and theoretical preparation amounts for a target pH.

Explore all 118 elements by name, symbol, atomic number, category, group, period, block, phase, and atomic weight.

Calculate the resulting final concentration when mixing two solutions of different concentrations.

Plan a dilution series with tube concentrations, transfer volumes, diluent volumes, and a printable bench protocol.

Five dilution scenarios in one tool: C1V1=C2V2, stock spikes, back dilution, exact final volume, and mixing two solutions.

Calculate molarity, required mass, final volume, or convert between % w/v and molarity for general solutions.

Calculate the exact spike volume or stock concentration needed to adjust an existing solution's concentration.

Convert the standard squared metric sequence, hectares, acres, and common imperial area units.

Convert bits, bytes, decimal storage units, and binary storage units.

Convert the standard metric sequence from kilometers to nanometers, plus land miles and nautical miles.

Convert mass between kilograms, grams, milligrams, micrograms, nanograms, picograms, femtograms, and attograms.

Convert molar concentration from molar through attomolar laboratory scales.

Convert amount of substance from moles through attomoles.

Convert temperatures between Celsius, Fahrenheit, and Kelvin.

Convert cubic metric units, liter scales, and common US and UK volume units.

Calculate loan payments and view a yearly amortization schedule with balance, interest, and principal paid.

Convert a nominal interest rate to APY and project savings growth with monthly deposits.

Calculate CAGR from beginning value, ending value, and elapsed time.

Calculate compound interest for savings or investments over time.

Estimate your full monthly mortgage payment (PITI) including principal, interest, property taxes, home insurance, PMI, and HOA fees.

Replay an existing mortgage with irregular extra principal payments, then compare keeping the loan with refinancing.

Calculate exact age in years, months, and days from a date of birth to today or any selected date.

Calculate BMI for adults ages 20 and older using metric or US customary measurements, with categories and limitations.

Count working days between dates while excluding selected weekends and holiday dates.

Calculate the time between two dates in calendar years, months, days, total days, and weeks.

Calculate percentages, percentage change, and original values with reverse percentages.

Add or subtract hours and minutes from a date and time, including date rollover.

Compare city time zones, current UTC offsets, meeting conversions, and availability overlap.

Calculate gross and net shift time, subtract breaks, and separate regular and overtime hours.