Aequicalculus

Aequicalculus (direct Latin translation, aequus ["equal"] + calculus ["pebble"], of the Greek isopsephy, ἴσος, isos ["equal"] + ψῆφος, psephos ["pebble"]) is a system of converting Latin letters to defined numeric values, based on Greek-to-Latin correspondences, as observed by John Opsopaus. Unlike in Greek isopsephy or Hebrew gematria, where the conversions are based on classical utilisation of every glyph as both a letter and a numeral, Latin only utilised a limited set of letters in combinations as ordinary numbers (I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000), and consequently the conversions are not based on routine equivalencies but rather assumed correspondences with other languages.

Conversion Table

Letter	Value
A, a	1
B, b	2
C, c	3
G, g	3
D, d	4
E, e	5
F, f	6
Z, z	7
H, h	8
Q, q	9
I, i	10
J, j	10
K, k	20
L, l	30
M, m	40
N, n	50
O, o	70
P, p	80
Q, q	90
R, r	100
S, s	200
T, t	300
U, u	400
V, v	400
W, w	400
Y, y	400
X, x	600

Tools

• https://hatch.kookscience.com/cipher/iso.php?cipher=la_3