Health
Why BMI Gets Athletes Wrong (and What Doesn’t)
BMI can’t tell muscle from fat. Here’s what the number actually measures, and what to check instead.
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Finance
Margin of Safety: The Number That Matters More Than Break-Even
Two businesses, same profit, very different risk — why margin of safety beats break-even alone.
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Health
The Old Calorie Formula Overestimates by 74 kcal a Day
Harris-Benedict dates to 1919. Mifflin-St Jeor is what dietitians use now — the real gap, worked out.
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Home
The 0.5m³ Line: When Bagged Concrete Stops Making Sense
Below half a cubic metre bagged mix wins. Above it, ready-mix starts winning on cost and your back.
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Finance
A £3,000 Balance on Minimum Payments: Still Unpaid After 50 Years
Real simulation: minimum payments on £3,000 at 24.9% APR cost over £13,500 in interest — and counting.
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Home
What Your Appliances Actually Cost — Not What They Feel Like
A kettle costs 23p a year. An EV charger costs £2,668. Real annual costs for 5 common appliances.
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Home
Why a 20m Fence Never Comes Out to Exactly 20m
Standard panel widths force a round-up — and posts don’t double the way people assume.
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Finance
"Divide Your Salary by 220" Underprices Freelancers by 57%
The common day-rate shortcut ignores tax, non-billable days and costs — real numbers on the gap.
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Home
Why Your Gas Meter Reading Never Quite Matches Your Bill
The real m³-to-kWh conversion behind every UK gas bill, and what typical households actually pay at the current price cap.
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Finance
2% vs 3.36%: Why "Just One Point" of Inflation Matters
Over 20 years on £10,000, the gap between the BoE target and recent UK inflation is worth £4,500.
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Finance
SDLT vs LBTT: Where Scotland Is Cheaper, and Where It Isn’t
Real 2026/27 figures across four price points — the crossover where Scottish stamp duty flips from cheaper to more expensive.
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Home
Why Your Paint Coverage Never Quite Matches the Tin
What actually shifts paint coverage away from the tin’s claimed 12-14 m² per litre.
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Finance
Starting Your Pension at 25 vs 35: £24k More In, £153k More Out
The same monthly contribution, started 10 years earlier, produces vastly more — real numbers on why.
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Finance
50% Return Sounds Great — Until You Ask How Long It Took
The same 50% return means wildly different things depending on the years it took to get there.
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Home
A 45° Roof Has 41% More Surface Than Its Footprint
Footprint-based roofing estimates get dramatically worse as pitch increases. Real numbers at 4 pitches.
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Home
Measuring an L-Shaped Room Without Getting It Wrong
The "full rectangle minus the missing corner" method that turns an awkward shape into two measurements.
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Finance
Salary & Tax Calculator
Free salary and tax calculator. Calculate your take-home pay after income tax, National Insurance and pension contributions.
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Home
Same Solar System, Different Country: Scotland vs South England
An identical 4kWp system pays back nearly 2 years faster in South England — purely down to sunlight.
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Home
Why Buying Extra Tiles Now Beats Matching Them Later
Tile dye lots vary between batches — why the spare box you skip today can become impossible to match.
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Finance
The Flat Rate Scheme Has a Break-Even Point — Here’s Where It Is
Real numbers across four expense levels showing exactly where the Flat Rate Scheme stops paying off.
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