What is the file size limit for CSVs?

Process files up to the browser memory limit.

Can I apply multiple formulas?

Yes — add multiple formula columns in sequence.

Apply spreadsheet-style formulas to CSV columns without opening Excel. Fast, private, and secure browser-based tool with no s

Your files never leave your device. Processed locally. 100% private.

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Complete your task perfectly in just three straightforward steps.

Type any arithmetic expression e.g. 15% of 2450, or (1200 * 12) / 100.

Reference column names to apply the formula to every row.

Copy the result or download the output CSV.

Everything you need to know about the Formula Calculator.

What operations are supported?

Addition, subtraction, multiplication, division, percentages, exponents, and parentheses.

Can I use it without a CSV?

Yes — use it as a standalone calculator for quick arithmetic.

Is my file uploaded?

No. Everything runs locally in your browser.

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