Practical guides
Answers first. Calculator second.
Use these guides when you want the reasoning behind a common estimate, then run your own numbers with the linked calculator.
GuideHow Much Paint for a 1,500 Sq Ft House?A practical way to estimate wall-paint gallons for a 1,500 sq ft home without confusing floor area with paintable wall area.Read guide →GuideHow Much Paint for a 12×12 Room?Estimate gallons for a 12×12 room using wall height, openings, coats, coverage and a practical waste allowance.Read guide →GuideHow Much Flooring Do I Need?Calculate flooring area, add a realistic waste allowance and convert the result into boxes before ordering.Read guide →GuideHow Much Concrete for a 10×10 Slab?Convert slab length, width and thickness into cubic yards and add a practical ordering allowance.Read guide →GuideWhat Size Generator Do I Need?Estimate generator wattage from running loads plus the largest startup surge instead of adding nameplate numbers blindly.Read guide →GuideHow to Estimate an Electricity Bill from kWhTurn monthly kWh usage and your electricity rate into a quick bill estimate while accounting for fixed fees.Read guide →GuideHow Much Does It Cost to Charge an EV at Home?Estimate one home EV charge using battery energy added, charging losses and your actual electricity rate.Read guide →GuideHow Long Does Level 2 EV Charging Take?Estimate Level 2 charging time from battery energy added, vehicle AC charging limit, EVSE power and charging efficiency.Read guide →GuideLevel 1 vs Level 2 EV Charging: How Much Faster?Compare Level 1 and Level 2 charging time for the same battery energy instead of relying on generic miles-per-hour claims.Read guide →GuideEV vs Gas Cost Per MileCompare EV electricity cost per mile with gasoline fuel cost per mile using your own efficiency and local prices.Read guide →GuideWhat Size Moving Truck for a 2-Bedroom Home?Estimate moving-truck cargo volume from the amount you actually own instead of relying only on bedroom-count charts.Read guide →GuideHow Many Moving Boxes Do I Need?Estimate a starting box count from household size and packing density, then adjust for how much you actually own.Read guide →GuideWhat Size Storage Unit for a 2-Bedroom Home?Estimate storage-unit floor area from actual item volume, stacking height and packing efficiency.Read guide →GuideHow Many Drinks for 100 Guests?Estimate total beverage servings from guest count, event duration and an adjustable drinks-per-hour assumption.Read guide →GuideHow Much Alcohol for 100 Wedding Guests?Plan a wedding bar using guest count, reception length and your own beer, wine and spirits split.Read guide →GuideHow Much BBQ Meat for 50 People?Work backward from cooked serving size and expected yield to estimate the raw pounds of BBQ meat to buy.Read guide →