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Operelli tools

Free Contractor Calculators & Jobsite Tools

Quick, practical tools for measurements, calculations, and everyday work. Free to use — no signup.

Measurement

Convert and calculate measurements without leaving your phone.

Available

Unit converter

Convert length, area, volume, and weight between common jobsite units.

Available

Feet & inches

Add, subtract, and convert feet-and-inches with common fractions.

Available

Area

Quick rectangle, triangle, and circle area for takeoffs and layouts.

Available

Slope

Rise, run, percent grade, and pitch helpers for drainage and layout.

Available

Volume

Box and cylinder volume for spoil, fill, and simple containers.

Math & money

Simple bid and percentage helpers for any trade.

Available

Percentages

Percent of a number, percent change, and what percent X is of Y.

Available

Markup / margin

Convert between markup and margin so bids stay clear.

Jobsite helpers

Everyday helpers for conditions and time on site.

Available

Time duration

Add hours and minutes for labor blocks and schedule windows.

Available

Temperature

Convert Fahrenheit and Celsius for jobsite and material conditions.

Available

Weather watch

Check the official U.S. NWS forecast for a U.S. ZIP before outdoor work windows.

These tools are for everyday estimating and planning. They are not a substitute for licensed engineering judgment on structural work.