Practical guides, how-tos and comparisons to get the most out of our free online tools.
A full chart is built from four things: the day, the month and the year of birth, and a name. The life path reduces the three date parts and adds them; the birthday number is the day of the month on its own; the personal year adds the reduced birth month, the reduced birth day and the reduced calendar year.
Antonio Delgado · September 3, 2026 · 7 min read · 4 sources
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
The same 12.7 kg puppy at sixteen weeks predicts a 21.9 kg adult if it is a small breed and 38.5 kg if it is a giant one. The arithmetic is trivial; the class you pick is worth seventy-six per cent.
Lena Hoffmann · 6 min read
Two cats need three boxes, not two, and each should be one and a half body lengths long — 69 cm for an average adult. The litter figure that follows is larger than most people expect, and knowing why is the useful part.
Marco Bianchi · 6 min read
Length A + half B, width twice C, height D. The width rule is the one that fails people: a dog with 28 cm shoulders needs 56 cm of interior width, and no crate sold by weight rating tells you that.
Marco Bianchi · 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
Roll a 50 mm cone 80 mm tall and its pattern is a 190.8° slice of a 94 mm circle. Flatten a nearly cylindrical lampshade and the pattern radius runs to 839 mm — the shallower the taper, the further away the apex.
Lena Hoffmann · 6 min read
Thirty thousand stitches at 3.5 mm with fifteen per cent waste is 120.7 metres. The stitch count comes from the file; the average length is an assumption, and doubling it doubles the answer.
Antonio Delgado · 6 min read
At 1 %, a hundred attempts give you 63.4 % — not certainty. Ninety per cent takes 230 attempts and ninety-nine takes 459, and more than a third of players are still empty-handed at a hundred.
Lena Hoffmann · 4 min read
Deduplication compares whole rows exactly, cell type included. Five identical-looking rows came out as three, because one held a number, one a string and one a string with a leading space.
Daniel Okonkwo · 4 min read
A spreadsheet file stores both the formula and the last answer Excel computed. Stripping the formula leaves the stored answer — and leaves a blank wherever the file never carried one.
Daniel Okonkwo · 4 min read