UnitNerd blog
Practical numbers for charging your car, choosing materials and planning your next DIY project.
EV charging
How to estimate EV charging time
Work out the energy your battery needs, understand charger and car limits, and turn a charging-time estimate into a practical plan.
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Building materials
Planning building material quantities without double-counting waste
Turn measured dimensions into material quantities, allow for waste once, and combine your calculator results into a project shopping list.
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DIY projects
How much paint do you need for a room?
Measure your walls, subtract openings, choose coats and coverage, then estimate litres and tin sizes before starting your DIY painting project.
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EV home charging cost UK: a worked 7 kW example
A real worked example of what a 20–80% EV top-up costs on an off-peak tariff, a standard tariff and a public rapid charger in the UK.
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EV real-world range: miles per kWh explained
Work out an electric car’s real-world range from battery size and miles per kWh, with summer, winter and motorway examples.
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How many bricks per m²? Garden wall worked example
Why a single-skin wall uses about 60 standard UK bricks per m², with a worked garden-wall example including wastage and rounding.
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How much concrete for a shed base? m³ and bags
Work out the concrete volume for a typical shed base in m³, add a sensible allowance and turn it into bags or a ready-mix order.
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How many tiles do I need? A bathroom wall example
Measure a bathroom wall, subtract the window, add wastage and round to whole tiles and packs with this real worked tiling example.
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How much decking do I need? A 3.6 m × 4 m example
Count decking boards and joists for a real 3.6 m × 4 m garden deck, including board gaps, joist spacing and a wastage allowance.
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