Guides

Short explanations of the math behind the calculators. Each guide links straight into the tool.

• How Much Concrete Do I Need?Measure a slab, convert to cubic yards, decide between bags and ready-mix, and choose a waste allowance.
• How Many Gallons of Paint Do I Need?Measure walls, subtract doors and windows, and account for coats and real-world coverage.
• How Much Does It Cost to Charge an EV at Home?The formula for home charging cost, why charging losses matter, and how to compare with gasoline.
• How Do I Calculate Voltage Drop?The voltage drop formula for copper and aluminum wire, the 3% recommendation, and why ampacity is a separate check.
• How Much Mulch Do I Need?Convert bed area and depth to cubic yards or bags, and decide how deep to spread mulch.