Helike Construction Calculator

Helike is the construction calculator built for contractors, builders, and DIYers. Get instant answers for concrete, roofing, and everyday jobsite math.

★ FEET-INCH-FRACTION CALCULATOR
Add, subtract, multiply, and divide measurements in feet, inches, and fractions.

★ AREA CALCULATOR
Calculate square footage for rectangles, triangles, circles, and trapezoids. Perfect for flooring, painting, and material estimates.

★ UNIT CONVERTER
Convert between imperial and metric units for length, area, and volume. Feet to meters, square feet to square meters, cubic yards to cubic meters, and more.

★ CONCRETE CALCULATOR
Enter your slab dimensions (length, width, thickness) and get cubic yards plus the number of bags you need.

★ BLOCK & CMU CALCULATOR
Calculate how many concrete blocks you need plus mortar bags. Works for standard 8x8x16 CMU and other common sizes.

★ FOOTING CALCULATOR
Size your strip footings and spread footings correctly. Enter dimensions to calculate concrete volume for continuous wall footings and column footings.

★ ROOF SQUARES CALCULATOR
Enter your roof footprint and pitch to get total roofing squares. Essential for ordering shingles, underlayment, and other roofing materials.

★ PITCH CALCULATOR
Convert between rise/run (X:12), degrees, and percentage slope. See all three formats at once.

★ SHINGLE & BUNDLE CALCULATOR
Get accurate bundle counts for three-tab and architectural shingles. Includes starter strips, ridge caps, and underlayment square footage.

Perfect for general contractors, concrete contractors, masons, roofers, carpenters, remodelers, and DIY homeowners.