Exact Mass Calculator

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What is the Exact Mass Calculator?

The Exact Mass Calculator helps chemists and researchers determine the monoisotopic mass of a compound based on either its molecular formula or SMILES (Simplified Molecular Input Line Entry System) notation.

The monoisotopic mass is the precise mass of a molecule calculated using only the most abundant isotope of each element — for example, ¹H, ¹²C, and ¹⁶O. This value is especially important in high-resolution mass spectrometry.

This tool is valuable in various fields such as mass spectrometry, drug development, and chemical structure verification. It supports both single and batch processing, enabling users to calculate exact masses for up to 1000 compounds at once.

BioChemCalc's calculator is browser-based, fast, and completely free to use. It requires no registration, making it accessible for both educational and professional purposes.

FAQ

What is exact mass?

Exact mass refers to the monoisotopic mass of a molecule calculated using the most abundant isotopes of each element.

What is the difference between exact mass and molecular weight?

Exact mass is based on a single isotope, while molecular weight is an average based on natural isotope abundance.

Can I calculate mass from SMILES?

Yes, this tool supports SMILES input and converts it to molecular structure before calculating the exact mass.

Why is exact mass important in mass spectrometry?

Exact mass allows precise identification of compounds in high-resolution mass spectrometry.

How many compounds can be processed at once?

Up to 1000 compounds can be processed in batch mode.