98 in this format. Showing the 48 most recent.
Life path, expression, soul urge, personality, birthday, maturity, personal year. Everything comes from a day, a month, a year and a name — and two of the seven are arithmetic restatements of the others, which is worth knowing before reading them as seven separate findings.
Antonio Delgado · 7 min read
The soul urge adds only the vowels, so the entire calculation turns on whether Y is one. Mary Taylor reads 6, 22 or 8 depending on the rule you apply, and every name in a 1,200-name corpus that contains a Y changes when you flip the setting.
Antonio Delgado · 6 min read
The two letter charts in circulation give the same name the same number only 10.3 % of the time, barely more than the one-in-nine you would get by drawing lots. Albert Einstein is a 9 in one chart and a 1 in the other, and neither reading is a mistake.
Antonio Delgado · 6 min read
Add the digits of the whole date, or reduce day, month and year first and then add: two textbook methods for the same life path. Over the 46,021 dates from 1900 to 2025 they give different answers 6,398 times — 13.90 %. Every single disagreement is about a master number.
Antonio Delgado · 7 min read
Points over total is trivial. What is not: averaging percentages instead of weighting them can shift a mark by twelve points, negative marking changes when guessing is worth it, and the same 62 % is a fail on one scale and an upper second on another. What the tool does, and the two things it cannot do.
Lena Hoffmann · 13 min read
Nine absences give five different rates depending on what you divide by — scheduled days, sessions, weekdays, calendar days, or a part-timer's own diary. What the tool computes, the three places it misleads, and why the Bradford Factor makes short repeated absences look ten times worse than one long one.
Camille Laurent · 11 min read
Twenty-five and five come from Francesco Cirillo's method, not from a trial. What the research actually measured is task switching and the cost of getting back in — and the reason a fixed interval helps is not that 25 minutes is optimal. Plus what the planner really returns, including the long break it quietly leaves out.
Lena Hoffmann · 12 min read
End minus start minus break is the easy part. Whether a break is paid and whether it counts as working time are two different questions with different answers by country — plus rounding, where timesheets actually go wrong, and what the tool does with a shift that crosses midnight.
Camille Laurent · 13 min read
A calculator gives you an order of magnitude, and anything holding up a floor, a roof or people needs an engineer and a code check. Between those two facts there is a great deal worth knowing: which power of the span the deflection really follows, which loading case the tool assumes, and what L/360 is in fractions of an inch on a span you can measure.
Marco Bianchi · 13 min read
The generator's random source audited line by line, what SAE actually removes, why transition mode gives most of it back, and the thing every guest-network guide leaves out.
Daniel Okonkwo · 13 min read
Entropy prices one attack: offline guessing against a stolen hash. Above roughly 90 bits the number stops deciding anything — and the meter on this site under-reported a random 20-character password in 300 draws out of 300.
Daniel Okonkwo · 12 min read
The addition is the easy half. Turning balances into the fewest possible transfers is a different, and much harder, computation — and the tool's own note claims a minimum it does not deliver. Plus uneven shares, and why the awkwardness is ambiguity rather than money.
Camille Laurent · 11 min read
The addition is trivial. What people miss is the annual plan billed once, the trial that converted, the conversion fee on a service billed abroad — and the break-even month that decides whether a yearly plan was ever a saving.
Camille Laurent · 11 min read
Salary is not the cost. The ticker applies no loaded-cost multiplier of its own, so the rate box is where you have to put it. And the number is for one comparison: a recurring meeting against the written update that would replace it.
Camille Laurent · 10 min read
Blur and pixelation are reversible — not by undoing the maths, but by guessing forwards. Against this tool's own blur and pixelate modes, a recovery attack returned the hidden value at rank 1 of 10,000. Both modes have since been removed. Here is what is left, and why it cannot be attacked the same way.
Daniel Okonkwo · 12 min read
Two to four inches, and the right end of that window depends on the material: bark takes 3, screened compost takes 1 to 2, and gravel takes 1. Here is the depth trade-off, the settling nobody buys for, and the bag conversion where the count goes wrong.
Marco Bianchi · 13 min read
The hourly rate is the small part. Minimum hours, the late-return surcharge, the ride home — and the question that changes the number most: casual help, or a declared employee? Six markets, named, with the thresholds that could be verified.
Camille Laurent · 12 min read
A local two-bedroom move estimates at $954–$1,347. Four boxes ticked on a three-bedroom move — peak week, full packing, two flights, full-value cover — take it from $1,730 to $3,162. Quotes differ on exclusions, not on price.
Camille Laurent · 12 min read
Section area times length times density, for nine profiles and fourteen metals. What the calculator returns, why one figure covers every carbon-steel grade, and the two places its geometry is not the merchant's geometry.
Marco Bianchi · 13 min read
Blocks, base gravel, drainage stone, geogrid and pipe, counted from the calculator's own output. Then the number nobody puts in a materials list: a saturated backfill pushes about 2.2 times as hard as a drained one.
Marco Bianchi · 12 min read
A PDF carries its metadata twice, in two stores that can tell different stories, and neither of them is the whole story. Here is what is actually in the file, what clearing it removes, and the two things that survive every wipe.
Daniel Okonkwo · 15 min read
Bars each way, splice lengths in bar diameters, cover from the edge, and the exact tonnage to order. Run against the calculator, including the two places where its bar count comes out short.
Marco Bianchi · 12 min read
How to tell a sound secret-key generator from an unsound one, using this one as a worked example: which random source it calls, how to compute the entropy yourself, and what actually breaks the day you rotate the key.
Daniel Okonkwo · 13 min read
Three encodings, one visible difference: %20 or +. The builder's form mode matches URLSearchParams byte for byte on seventeen values — but give it a base URL with a fragment and every parameter lands inside the hash, where no server sees it.
Daniel Okonkwo · 12 min read
Count pieces first, then linear feet, then board feet. A 2×4 measures 1½ × 3½ inches but is billed on the full 2 × 4 — 34 % of what you pay for is sawdust. Worked from the calculator's real output, with the waste rule it actually applies.
Marco Bianchi · 13 min read
Four real stylesheets run through the minifier, measured raw and after gzip. Stripping every space saved 48, 103, 104 and 147 compressed bytes; stripping comments saved 57, 1 358, 2 420 and 1 042. Plus the five inputs this minifier breaks.
Daniel Okonkwo · 14 min read
Three commands hide behind three buttons: one frame at a timestamp, a fixed number spread across the clip, or one every N seconds. Here are the exact arguments, the 60-frame ceiling and the reason a frame from the middle of a compressed clip can never be as sharp as a keyframe.
Daniel Okonkwo · 12 min read
A paste carries characters you cannot see: no-break spaces, soft hyphens, zero-width spaces, tabs and CRLF. Four cleanup tools were run against each of them, and they use three different definitions of whitespace.
Daniel Okonkwo · 12 min read
The encryption is the easy half. Here is exactly what the browser tool does to your file — cipher, key derivation, salt, nonce — and why an encrypted attachment with the passphrase in the same thread protects nothing at all.
Daniel Okonkwo · 12 min read
Swapping names for identifiers does not take a database out of the GDPR — Article 4(5) and Recital 26 say so directly. Genuinely synthetic data is outside the Regulation altogether. That single distinction decides how you seed a staging environment.
Daniel Okonkwo · 16 min read
You do not need a penalty clause. A European directive gives every business creditor a statutory interest rate and a fixed recovery sum, both due automatically, and a term in the contract trying to take them away is void or presumed unfair. Here are the current rates and what they produce on a real invoice.
Camille Laurent · 13 min read
The usual advice is that a buy-back gets worse with age, because the price rises. The French scale is written to be actuarially neutral, so that is not quite what is happening — and once you see what actually moves the answer, the decision changes. Computed on the current parameters.
Camille Laurent · 14 min read
The rule of thumb everyone repeats — one point of rate gap — is not a rule and gets the timing wrong. What decides it is how much interest you have not yet paid, and the three countries answer the cost side in three completely different ways. Here is the arithmetic, computed.
Camille Laurent · 13 min read
Two regimes get merged into one paragraph everywhere, and they behave nothing alike. Selling a service to a business abroad and selling to a private customer abroad are governed by different articles, different thresholds and different filings. Here is the split, with the current figures.
Camille Laurent · 15 min read
A Markdown table has exactly two forbidden characters in a cell: the pipe and the line break. Here is what each one does, how a converter handles them, why the escape has to be applied in the right order, and why padding never matters.
Daniel Okonkwo · 15 min read
The percentages written into the deed decide who owns what for as long as the property exists — not who paid the deposit, not who pays the mortgage, not who does the renovation. In France, Spain and Italy the default is the same undivided co-ownership, and it comes with a right that surprises couples: either of you can force a sale.
Marco Bianchi · 11 min read
Furnishing a flat moves it from one tax code to another: 50 % of the rent is written off instead of 30 %, and a landlord on the full regime can depreciate the building. Since 15 February 2025 that depreciation is clawed back on sale, which changes the whole calculation.
Marco Bianchi · 10 min read
What happens to the header row, what happens to rows of unequal length, what happens to types — and the one thing transposing is regularly mistaken for and cannot do.
Daniel Okonkwo · 13 min read
One country gives you a formula that changes with the car's horsepower and the distance driven, one gives everybody the same figure per kilometre, and one publishes a table per model. All three are meant to cover the whole cost of running a car, and all three leave out things people assume are included.
Camille Laurent · 12 min read
The migration, the tooling change, the process fix: the most common business case there is and the least documented. The value is avoided cost plus recovered time — and on a $130,000 migration, 60.5 % of the recovered hours have to be genuinely redeployed before the five-year net present value even reaches zero.
Camille Laurent · 18 min read
The coverage ratio is the gate, the guarantee is the second price and the rate is an output. On a 400,000 loan, cutting the rate by a full point moves the coverage ratio by 0.018 — while two extra years of term move it by 0.216. The whole negotiation is in the wrong place.
Camille Laurent · 19 min read
There is no single towing capacity. There are four or five separate limits, and the one that binds is rarely the tow rating on the brochure — it is usually the vehicle's own weight budget, quietly consumed by the people sitting in it.
Marco Bianchi · 16 min read
Removing tags and sanitising HTML are two different jobs. One real fragment run through a naive regex and through a formatting-aware stripper, with script and style contents, block breaks, comments, CDATA and entity order all shown as output.
Daniel Okonkwo · 14 min read
Engine rpm reaches the road through one unbroken multiplication chain, and the last link is the tyre. Change the tyre's rolling circumference and the speedometer goes wrong by exactly that percentage — in a direction the law cares about.
Marco Bianchi · 15 min read
Multiply fresh yeast by 0.4 for active dry and by 0.33 for instant. Those two numbers are the whole chart, they are King Arthur's professional figures, and they are approximate — here is how far, and what else changes when you swap.
Marco Bianchi · 7 min read
That tick at the edit point is not a flaw in the software. It is a step in the waveform, and a step is broadband energy — which is the definition of a click. Here is the arithmetic, measured, and the two places you can put a cut so it never happens.
Daniel Okonkwo · 18 min read
There is no honest single figure for a renovation. Build it up by work type, accept that labour is the biggest and least predictable line, and hold 10 to 20 percent back for what the survey could not see.
Camille Laurent · 6 min read
A GIF has no real video compression: every frame is a whole picture, capped at 256 colours. That gives you an arithmetic you can do in your head — width times height times frames — and three levers to pull when the upload box says the file is too big.
Daniel Okonkwo · 14 min read