Construction Calculators

These bullet proof construction calculators feature automatic firing and are free and easy to use.

Use this automatic stair calculator for applications requiring the risers to be 7 3/4″ maximum. Use the landing section to quickly solve for any step.

Use this feet and inch diagonal calculator to easily find the diagonal between two sides of any rectangle. This makes squaring up any lay out a snap.

Use this common rafter caclulator by entering the span, the roof pitch, and the ridge thickness. Enter these values and these results are automatically fired, the length of the rafter, the run, the rise, and the height of the scaffold. 

Calculate the size needed for a beam, girder, or header made from No. 2 pine or LVL. Covers any span and every load with pin point accuracy.

This roof decking calculator determines the slopes for hips and valleys on all pitches. Enter the length of one side and select a pitch.

Calculate how many pieces of siding it will take to cover a wall or gable with this simple tool. Easy to use radio buttons and number fields.

Calculate the volume of concrete in cubic yards by entering the values for the three dimensions in feet and inches. This free and simple DIY tool is fast. It features automatic firing so there is no need to click on a “calculate” button.

This calculates the jack rafters on any roof pitches. It does not matter if they are equal. All you need is the longest masurement.

This bastard pitch rafter calculator returns the length and pitch for the rafter once the rise and run have been entered.

Use this feet and inch rafter calculator in situations where one wall is taller than the other. Enter the span, the difference in wall heights, the pitch, and the thickness of the ridge.

This hip roof calculator returns the value of the common rafter, the side rafter, the length of the hip, the off set of the hip, the height of the scaffold, and much more.

This jack rafter calculator works perfectly every time. Use the drop downs to enter the long rafter, the short rafter, and how many rafters to get reliable results every time for every situation.

Use this gable stud calculator to solve for the values of all the studs on 16″ center in a gable wall from the short one up or the long one down on all standard roof pitches.

Use this free tool to easily find the weight of pine, treated wood, green lumber, and laminated beams in all sizes. Use the drop downs to select a length in feet and inches.

Use this simple tool to accurately calculate the volume of concrete required for any sized post hole and any common sized post.

How many tons of gravel do I need?  This calculator solves for the cubic yards but returns the number of tons based on 2,800 lbs. per yard.

Calculate the pitch of a rafter according to its rise and run. Use the drop downs to select a run, then select a rise and the pitch will be returned.

How many 4′ x 8′ sheets of plywood do I need? This calculator does not simply divide the total square footage by 32.  It figures how many pieces long, then how many wide.

Calculate how much flooring it will take with easy to use tool. Select hardwood, tile, plywood or carpet. Then enter a width and length for the room in feet.

This ramp calculator is ideally suited for planning and building a wheelchair accessible handicap ramp. It includes 2012 IRC building code requirements.

Calculate the cost for pole barns and other post frame buildings according to the building’s width and length, the height, and wall criteria.

Use this simple tool to accurately convert a roof pitch to degrees. Enter the values for the roof pitch in inches per foot rise.

Use this calculator to easily multiply a number consisting of feet, inches, and a carpenter fraction by a factor that could be a decimal value.

Divide a number consisting of feet, inches, and carpenter fractions with this free and simple on-line calculator. Use the number boxes below to select how feet, inches, and the fraction for the dividend.