Free tools for spreadsheets & data
Small, genuinely useful tools that run entirely in your browser — no account, no upload limits, nothing leaves your device. Use them here, or embed any of them on your own site for free.
Forecast calculator
Paste a column of numbers and get an auto-tuned trend forecast with a chart, confidence range and downloadable CSV.
EmbeddableReporting cost calculator
Work out what manual reporting actually costs you each year — people, hours and rate — and how much is automatable.
EmbeddableSpreadsheet risk checker
Answer eight quick questions and get a risk score for your critical spreadsheet — with tailored fixes for the weak spots.
EmbeddableCAGR calculator
Compound annual growth rate between two values over time — the smoothed yearly rate, with a projection.
EmbeddablePercentage change calculator
Percentage increase or decrease between two numbers, plus the absolute difference and direction.
EmbeddableSample size calculator
How many survey or test responses you need for a target confidence level and margin of error.
EmbeddableStatistics calculator
Paste numbers, get mean, median, mode, standard deviation, quartiles and the full descriptive summary.
EmbeddableNPV & IRR calculator
Enter an investment and its cash flows — get net present value, internal rate of return and payback.
EmbeddableExcel & CSV viewer
Open any .xlsx, .xls or .csv file in your browser — switch sheets, search rows. Nothing is uploaded.
In-browserExcel ↔ CSV converter
Convert Excel to CSV or CSV to Excel — pick a sheet, preview, download. Runs locally.
In-browserCSV ↔ JSON converter
Convert CSV to JSON and back — quoted fields and numeric types handled. Copy or download.
In-browserChart maker
Paste data, pick bar, line or pie, and download a PNG chart for your deck or report.
In-browserExcel formula builder
Build SUMIF, VLOOKUP, XLOOKUP, IF and more by filling boxes — copy correct syntax instantly.
In-browserForecasting calculator
Holt-Winters forecasting with auto-tuned parameters and confidence bands. Paste a monthly series, get a 12-month forecast.
In-browserRFM segmentation tool
Score customers by Recency, Frequency and Monetary value. Finds Champions, Loyal and At-risk segments in seconds.
In-browserCohort retention tool
Build a retention curve and cohort heat map from a list of customers and dates. No pivot tables required.
In-browserProject tracker
A live task tracker with RAG status, % complete and days remaining. Runs in the browser, nothing to install.
In-browserBI pricing calculator
Work out what Power BI, Tableau, Looker and the rest actually cost your team once seats and sources are counted.
In-browserSpreadsheet statistics
Sourced answers to the questions people (and AI assistants) ask about spreadsheets, from The State of Spreadsheets 2026.
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DataHub Pro turns any spreadsheet into dashboards, forecasts and reports in minutes — with an audit trail for every number.
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