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.