Home and energy
What your appliances cost to run, what standby really adds up to, and how much material a room actually needs.
Electricity
3 tools- Appliance running cost calculator Power rating, hours of use and your electricity price. That is enough to know what any appliance is really costing you.
- Standby power cost calculator The devices you never really switch off. Individually trivial, and together a line on your bill that nobody looks at.
- Is it worth replacing that appliance The efficient one costs more today and less every year. Whether that trade works out depends on numbers, and usually it is closer than the shop suggests.
Home projects and measurements
3 tools- Paint calculator for a room Room dimensions, number of coats and the area of doors and windows. We give you litres, tins and cost.
- Floor tile calculator Room size and tile size. We give you tiles, boxes and cost, with the wastage that cuts and breakages actually need.
- Air conditioner size calculator A rule of thumb for what size unit to look for, adjusted for the things that actually change the answer.
Other categories
- Money Compound interest, loans, mortgages and savings goals, with a breakdown of where every figure comes from and a chart of how it evolves.
- Dates and time Days between dates, ages, working days, deadlines and hours worked. Instant results, no sign-up.
- Cars and travel Real fuel economy, what a trip costs, cost per mile and splitting the bill between everyone in the car.
- Sport Running paces, race-time equivalents, splits and training zones. For running with your head as well as your legs.
- Health and body Body mass index, healthy weight, body fat and daily calories, with the formula in plain sight and what each number leaves out.
- Percentages and maths Discounts, increases, proportions, VAT, averages and grades. Everyday maths, properly explained.
- Business and pricing Margin, markup, commission, asset depreciation and what a campaign costs. The sums you do before setting a price.
- Developers Format JSON, encode and decode, convert bases and colours. The things you look up mid-afternoon with the editor open.