Helike: Construction Calculator

Helike: Construction Calculator

Concrete, roofing, framing, and more. Get instant answers to any construction calculation, right on the jobsite with no signal needed.

Free to use Works offline No account needed
Helike on the App Store Helike on Google Play

Just Enter the Numbers

Type your dimensions and get the answer instantly. No formulas to remember, no math to do.

Helike: Construction Calculator

Every Construction Calculator You Need

From concrete to roofing, footings to fractions. All the jobsite math in one place.

Feet-Inch-Fraction Calculator

Add, subtract, multiply, and divide in feet, inches, and fractions.

Area Calculator

Square footage for rectangles, triangles, circles, and trapezoids.

Unit Converter

Convert length, area, and volume between imperial and metric.

Concrete Calculator

Cubic yards and bag count for slabs, sidewalks, and pads.

Block & CMU Calculator

Block count and mortar bags for walls and foundations.

Footing Calculator

Concrete volume for strip footings and spread footings.

Roof Squares Calculator

Total squares from roof footprint and pitch.

Pitch Calculator

Convert between X:12 rise/run, degrees, and percentage.

Shingle & Bundle Calculator

Bundles, starter strips, ridge caps, and underlayment.

Right Triangle Calculator

Find the hypotenuse, a missing side, and angles from two known values.

Concrete Column Calculator

Cubic yards and bag count for round columns, piers, and Sonotubes.

Rafter Length Calculator

Common rafter length from the run and roof pitch.

Paint Coverage Calculator

Gallons of paint needed from wall area, coats, and coverage.

Drywall Sheet Calculator

Sheets and screws for walls and ceilings, plus a waste factor.

Joint Compound & Tape Calculator

Mud boxes and joint tape for finishing drywall seams.

Wallpaper Calculator

Rolls of wallpaper from wall area and pattern-repeat waste.

Built for the Trades

Sixteen calculators for the people who actually have to order the material.

General Contractors

Price a job, check a sub's numbers, and settle a question on site without walking back to the truck.

Concrete Contractors

Cubic yards and bag counts for slabs, footings, columns, and piers, before you call the ready-mix plant.

Masons

Block and CMU counts with the mortar bags to go with them, for walls and foundations.

Roofers

Squares from footprint and pitch, then bundles, starter, ridge cap, and underlayment from the same numbers.

Carpenters

Feet, inches, and fractions that add and multiply properly, plus rafter lengths and hypotenuses.

Remodelers

Drywall sheets, screws, mud, tape, paint, and wallpaper from the wall area you just measured.

DIY Homeowners

No trade background needed. Type the dimensions, read the answer, buy the right amount the first time.

Frequently Asked Questions

Yes, every calculator is free to use with no trial and nothing locked. Ads keep it that way, and a one-time in-app purchase removes them if you would rather work without interruptions.

Yes. Every calculation runs on your phone, so it works in a basement, inside a steel building, or on a site with no coverage. A connection is only needed for ads to load.

Sixteen: feet-inch-fraction, area, unit converter, concrete, block and CMU, footing, roof squares, pitch, shingle and bundle, right triangle, concrete column, rafter length, paint coverage, drywall sheet, joint compound and tape, and wallpaper.

That is the calculator most people open first. Add, subtract, multiply, and divide measurements in feet, inches, and fractions, and get an answer back in the same form instead of a decimal you have to convert.

Yes. The unit converter moves between imperial and metric for length, area, and volume, so feet to meters, square feet to square meters, and cubic yards to cubic meters are all one tap.

No. There is no signup, no login, and nothing to hand over. Install it and start calculating.