How to Calculate Stairs: Rise, Run and Stringer Length
Divide the total rise by about 7¾ inches and round up to get the number of risers. Here is the full method, code limits and a worked example.
ProjectCalcly Team
How Much Does a New Roof Cost? Asphalt vs Metal
Asphalt shingle roofs cost about $4.25–$12.25 per square foot installed, and metal roofs $10–$35. Here is what that means for your house.
How to Calculate Cubic Yards for Soil, Mulch, Gravel and Concrete
Multiply length, width and depth in feet and divide by 27. Here is a coverage chart by depth and what a yard of different materials weighs.
How to Calculate Square Footage (With Examples)
Square footage is length times width in feet. Here is how to measure rectangles, L-shaped rooms, circles and triangles, with examples.
How Much Grass Seed Do I Need? Rates per 1,000 Sq Ft
A new tall fescue lawn needs 8–10 lb of seed per 1,000 sq ft, while Kentucky bluegrass needs only 2–3 lb. Here are the rates and how to calculate.
How Much Attic Insulation Do I Need? R-Value by Climate Zone
ENERGY STAR recommends R-49 to R-60 attic insulation in most of the US. Here is the R-value for your climate zone and how many inches that is.
How Much Does It Cost to Run a Space Heater?
A 1,500 watt space heater costs about 27 cents per hour at the US average rate of 18.2 cents per kWh. Here is how to work out your own cost.
How Much Does a New AC Unit Cost? Prices by Ton and SEER
A new central AC unit typically costs $3,000 to $8,000 installed, depending on size and efficiency. Here are prices by tonnage and SEER.
How Much Does Window Replacement Cost? 2026 Price Guide
The average replacement window costs about $517 installed in 2026. Here are prices by material, style and glass, with whole-house examples.
How Much Does a Bathroom Remodel Cost in 2026?
The average bathroom remodel costs about $15,600 in 2026, with most between $6,500 and $24,700. Here are costs by size and finish level.
How Much Does a Kitchen Remodel Cost in 2026?
Most homeowners spend $30,000 to $50,000 on a mid-range kitchen remodel. Here are 2026 costs by size and scope, cabinet prices and ways to save.
What Size Generator Do I Need to Run My House?
Most homes can run essentials on a 5,000–7,500 watt generator. Here is how to add up running and starting watts to choose the right size.