Molecular Mass Converter
Enter any known OD, mass, or molar value and get all related units for DNA, RNA, or protein in one screen.
What it does
Select dsDNA, ssDNA, ssRNA, or protein, then type the one value you know—OD₂₆₀, ng/µL, nM, kDa, or others—and every related quantity updates instantly. Paste values with unit suffixes (e.g. "2.4 µg/mL") and the tool routes them to the right field.
For nucleic acids, optionally paste a sequence to replace generic OD factors with sequence-specific extinction; a badge shows when the estimate is exact or approximate. The Dilution Advisor gives pipetting steps for your target concentration and volume. Batch mode accepts up to 96 rows from a NanoDrop export and returns ng/µL and nM per sample. The Purity tab interprets A260/A280 and optional A230 with plain-language contamination warnings. Copy fields, export CSV, or restore recent calculations from browser history—no tab-switching between vendor calculators.
Why researchers use it
- Avoid tab-switching between NEB, Promega, and EndMemo
- Enter any unit and get all related values instantly
- Convert dozen NanoDrop readings in one batch paste
- Catch contamination with plain-language purity warnings
- See when OD uses generic versus sequence-specific coefficients
Best for
- RNA and DNA NanoDrop quantification
- Protein mass-to-molar conversions
- NGS library prep multi-sample batching
- Checking prep purity before downstream work
- Planning dilutions from stock concentrations
- GC-rich or AT-rich sequence OD correction
What makes it different
NEBioCalculator, Promega Biomath, and EndMemo each handle one direction or molecule type at a time—you pick the right calculator tab and start over if you entered the wrong module. None offer batch NanoDrop conversion, and most use fixed OD factors without warning on sequence bias.
This browser tool keeps protein and nucleic acid conversions on one screen with any field as the entry point. Paste sequence for accurate OD₂₆₀, run up to 96 samples in batch mode, interpret purity ratios inline, and get dilution pipetting steps—all without install or account.
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