· 3 min read
How Much Does an Appliance Cost to Run? A Simple Method
Turn an appliance's wattage and daily hours into an annual running cost using one formula: power times hours times your price per kWh.
Articles by Marco Bianchi
Home, DIY & motoring writer · View profile
· 4 min read
How to Substitute a Cake Pan Size Without Ruining the Bake
Swap one cake pan for another by matching their area, then adjust batter depth and baking time so the cake rises and bakes evenly in the pan you actually own.
· 3 min read
What Is the Heat Index? Why It Feels Hotter Than It Is
The heat index combines air temperature and humidity into a single 'feels-like' number, and explains why a humid 90-degree day can be dangerous.
· 4 min read
Pizza Dough Hydration Explained: What the Percentage Means
Understand what hydration percentage means, how water-to-flour ratio shapes your crust, and which level to choose for pan, Neapolitan, or New York style pizza.
· 3 min read
How Many Concrete Blocks Do I Need? Blocks, Mortar and Waste
Work out how many concrete blocks a wall needs from its area, add mortar and a waste allowance, and avoid a second trip to the yard.
· 3 min read
How Much Roofing Material Do I Need? Area and Squares
Turn your building footprint into true roof area using the roof pitch, then convert to roofing squares or square meters plus a waste allowance.
· 4 min read
How to Compare Unit Prices and Find the Better Deal
Turn any package price into a price per pound or ounce so you can compare sizes and brands honestly, ignore the marketing, and spot the real bargain on the shelf.
· 3 min read
How Far Can I Drive on the Fuel I Have Left?
Estimate remaining range from fuel left and your car's economy. A simple method for gas and diesel, with a worked example and a safety margin.
· 3 min read
How to Convert kWh to CO₂: Grid Emission Factors Explained
Convert electricity in kWh into CO₂ emissions using your grid's emission factor — and understand why that factor differs so much by country and time.
· 4 min read
How to Adjust Cooking Time for Weight and Temperature
Scale roasting time to the weight of your joint and adjust for oven temperature, so a bigger or smaller cut comes out cooked through but never dry.
· 2 min read
Your Flight's Carbon Footprint, Explained
How much CO₂ does a flight emit? Learn the per-passenger-kilometre figures, why short hops are worst per mile, and what the numbers really mean.
· 3 min read
How Many Deck Boards Do I Need? Coverage and Gaps
Work out deck boards from the deck area, each board's covered width including the gap, and a waste allowance for cuts and the picture-frame border.
· 3 min read
How Far Apart to Plant? Spacing and Plants per Area
Turn a plant-spacing figure into how many plants you need for a bed or row — including the difference between square and triangular layouts.
· 4 min read
How Much Meat Per Person (Portions by Cut and Occasion)
Plan portions with confidence: boneless meat, bone-in cuts and whole birds each need different amounts per guest.
· 3 min read
How Much Fencing Do I Need? Perimeter, Posts, Panels
Measure your run, then work out posts, panels, and rails from the perimeter and a standard post spacing so nothing is short on install day.
· 3 min read
How Long Does It Take to Charge an EV?
Charging time is battery energy needed divided by charger power. See how home AC and public DC compare, and why fast charging slows past 80%.
· 3 min read
What Size Solar Battery Do I Need? Sizing by Daily Use
Size a solar battery from your daily energy use, the days of autonomy you want, and the battery's usable depth of discharge.
· 4 min read
How Long to Thaw a Turkey (Safely, Every Time)
Fridge thawing needs about 24 hours per 4 to 5 lb; the cold-water method is faster. Follow food-safety rules to avoid bacteria.
· 2 min read
How Long Will My Road Trip Take?
Estimate a drive's real duration: divide distance by average speed, then add stops for fuel, food and rest. A simple method with a worked example.
· 12 min read
R-Values, U-Values, and What an Insulation Number Hides
R and U are reciprocals, and the two markets that read this site use different ones in different units — so an R-value quoted without its system means nothing. Worse, the number on the batt is not the number your wall achieves, because the studs are a parallel path.
· 12 min read
Where Household Water Actually Goes
People picture taps and showers, and metered end-use studies say the biggest single line is somewhere else. Here is the ranked budget from named national agencies, plus the arithmetic that changes behaviour: the dripping tap, the running tap, and the shower flow rate at which a bath becomes the cheaper option.
· 12 min read
A Cup Is Not a Cup — and That Is Why Your Cake Failed
Four different cups are in legal use, and the Australian tablespoon is a third bigger than everyone else's. But the error that actually ruins a bake is smaller than a border: the same cup of flour weighs 120 g or 160 g depending on how you filled it.
· 15 min read
How Much Tile and Grout You Actually Need
Floor area divided by tile area is the answer everyone reaches for, and it is always short. Count the grid instead, add the layout allowance, round to full boxes, keep attic stock — then derive the grout from the joint geometry rather than trusting the bag.
· 3 min read
How Much Drywall Do I Need? Sheets From Room Area
Turn wall and ceiling area into a sheet count using standard panel sizes and a waste allowance, so you order the right number of drywall sheets in one go.