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.