Built on published standards
Sports calculators that show their working.
Every tool states the formula it uses, the governing body and document version it comes from, the assumptions it makes, and what the number does and does not mean.
Calculators
Each tool implements a formula from a named governing-body document, with the version year and the date we checked it printed on the page.
Golf handicapping
Golf Handicap Index calculator
Handicap Index estimate from your score differentials, using the lowest 8 of the most recent 20.
Use Tool → WHS Rule 6.1 & 6.2Course Handicap calculator
Course Handicap and Playing Handicap, including the handicap allowance for your format.
Use Tool → WHS Rule 5.1aScore Differential calculator
A single round’s differential from adjusted gross score, Course Rating, Slope and PCC.
Use Tool →Running & racing
Running pace calculator
Pace, speed and finish time in min/km and min/mile, with a standard-distance pace chart.
Use Tool → Riegel & VDOTRace time predictor
Riegel equivalent times with an adjustable exponent, plus a VDOT-style second opinion.
Use Tool → WMA FactorsAge grading calculator
Age-graded time and age-grade percentage from the WMA factor table, labelled by table year.
Use Tool →Strength scoring
Explainers
Each one pairs to a calculator, writes the formula out in full, and names the document and version year the numbers come from.
Golf
How is a golf handicap calculated?
The score differential, the lowest-8-of-20 rule, and what the reduced-count table does.
Running
How to calculate running pace
Pace, speed and finish time from first principles, in both metric and imperial.
Strength
Wilks vs DOTS vs IPF GL points
Three published coefficient sets, why they disagree, and which one your federation uses.
Cricket
What is net run rate in cricket?
The ICC definition, decimal overs, and the bowled-out rule most calculators get wrong.
How accurate is the Riegel predictor?
Where the 1.06 exponent came from, and the distances and durations it breaks down over.
How to read a swimming points table
Base times, the cube relationship, and why 1000 points is not a world record.
What this site does not do
We compute from published rules. We do not predict outcomes and we do not advise on health. Specifically, there is no betting, odds, implied-probability, staking or expected-value content anywhere on this site; no match, race or season predictions; no news, results, fixtures or transfer coverage; and no reimplementation of a proprietary algorithm — including DLS, which we explain but never calculate.
Our outputs are estimates computed from the inputs you supply. Only an authorised governing body or affiliated club can issue an official handicap, rating or classification. We are not affiliated with or endorsed by any governing body named on this site.