How We Calculate: Methods and Sources

Every odds value, prize and rule on KenoMath comes from an official document and is calculated or checked by code. The list above shows each source, its date and the facts it backs.

212source documents
636facts quoted from them
211engine tests, all passing
157printed odds checked below

How each operator rounds its printed odds

Our odds are exact fractions. Operators print them rounded, and not all in the same way. Each printed "1 in N" below was compared with our fraction at the same number of digits.

GamePrinted odds checkedRounding that fits
Lotto Max OLG18to the nearest
Lotto 6/49 OLG7mostly to the nearest (5 of 7 cells)
Daily Grand OLG9to the nearest
Daily Keno OLG22to the nearest
Keno (WCLC) WCLC37always up
Keno (BCLC) BCLC37always up
KENO Atlantic Atlantic Lottery27to the nearest

157 of 157 printed odds fit one of the three ways of rounding. A cell that fits none is a misprint or a different rule in the source; the tests record it.

Every source document

National games

Keno and daily games

Regional games

Scratch tickets

Laws and rules

Operator pages

Saved copies of documents

Draw results

Help lines

From rule to number

  1. Read the game conditionsWe take the official game conditions and prize charts published by the organiser of the game.
  2. Count the combinationsCode counts all possible combinations and the winning ones for each prize tier, using the exact rules of the draw.
  3. Keep the exact fractionEach chance is stored as an exact fraction. Nothing is rounded until the number is shown on the page.
  4. Run the lock testOur value is compared with the operator's published odds. There are 211 such tests. If one fails, the page is not built.
  5. List the sourcesThe sources and their dates are listed in the source list at the top of this page.

How one chance is calculated

chance of a prize tier = winning combinations ÷ all possible combinations

Example: For example, the Lotto 6/49 jackpot has one winning combination out of all possible combinations. The Lottery Odds Calculator shows each tier.

The numbers behind the site

Official documents

212

Game conditions, prize charts and provincial rules we read and date.

Facts taken from them

636

Prizes, prices, rules and published odds, each with its source.

Lock tests

211

Checks of our calculated odds against the odds printed by operators.

Last full check

October 29, 2026

The date all sources were last checked again.

Who writes KenoMath

Who we are and what the site does and does not do.

Where each kind of number comes from

Kind of numberSourceHow we get it
Odds of each prize tierOfficial game conditionsCalculated by code, then lock-tested
Fixed prizes and ticket pricesOfficial game conditions and prize chartsRead from the document, with its date
Expected value per ticketOdds and prizes aboveCalculated by code
Province rules and agesOfficial provincial documentsQuoted from the source, with its date
Help linesOfficial help line pagesRead from the source, never typed

We name game organisers only as the source of their game rules. We do not link to them or rate them.

Exact value vs rounded value

Operator's odds chart

  • Odds rounded for quick reading
  • The last digit is the result of rounding

KenoMath

  • Exact fraction from the count of combinations
  • Rounded only once, when shown
  • Shown with more digits, so the last digit can differ
  • The lock test compares at the chart's precision, so rounded values match

Words used on this page

Game conditions
The official document that sets the rules, prizes and price of a game.
Prize tier
One level of prize, for example 5 of 6 or 6 of 7 + bonus.
Exact fraction
Winning combinations divided by all combinations, kept without rounding.
Lock test
A check that stops the build if our calculated odds, rounded the way the operator publishes them, do not match the operator's published odds.

Questions

How accurate are the odds on KenoMath?

Odds are calculated exactly by code from the rules in the official game conditions. Our calculated odds are compared with the operator's published odds in lock tests. For the basics, see Lottery Math, Explained Simply.

What happens if a game rule changes?

We read the new official document, update the fact and its date, and code recalculates every number that depends on it. The last full check of all sources was on October 29, 2026.

Why can the last digit of your odds differ from the official chart?

Published odds are rounded. We keep the exact fraction and may show more digits, so the last digit can differ. Rounded the way the chart is rounded, our value matches – the lock test checks this.

Where do the numbers on KenoMath come from?

From official documents (game organisers, provinces, official help line pages) and from code calculations based on them – 212 documents with 636 facts. The list at the top of this page shows each one with its date.