Guides
Charts, prices and step-by-step answers, with the numbers worked out by our calculators.
2026-10-20How Many Square Feet in an Acre? (43,560) – Chart & ExamplesAn acre is 43,560 square feet (4,047 m²). Charts for ¼, ½ and 1 acre, lot shapes, how big an acre looks, and how to measure your own lot.Read the guide →2026-10-20Wire Gauge Chart – AWG Sizes, Amps & mm² (2026)Wire gauge chart with ampacity for copper and aluminum (NEC 75 °C), wire size by amps, AWG to mm², and how distance changes the size you need.Read the guide →2026-10-20Cost of Concrete per Yard in 2026 – Driveway & Patio PricesReady-mix concrete costs about $150–$200 per cubic yard in 2026. See bag vs truck prices, the cost of a concrete driveway or patio per square foot, and how to estimate yours.Read the guide →2026-10-20How Long Does Concrete Take to Dry? Curing Time ChartConcrete sets in a few hours, can be walked on after 24–48 hours, driven on after 7 days and reaches design strength in 28 days. Curing time chart and tips.Read the guide →2026-10-20Roof Pitch Chart – Angles, Percent & Multipliers (1/12 to 12/12)Roof pitch chart from 1/12 to 12/12 with degrees, percent grade and the multiplier for roof area and rafters, plus how to measure your roof pitch and the most common pitches.Read the guide →