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
Wilks calculator
Wilks score in kg or lb, with a version selector for the original and revised coefficient sets.
Use Tool → IPF GL & DOTSIPF GL points calculator
IPF GL points by sex, lift type and equipment class, with DOTS as an alternative output.
Use Tool → Epley · Brzycki · LombardiOne-rep max calculator
Estimate your 1RM from reps to failure using three published formulas side by side, with the spread shown.
Use Tool →Cricket scoring
Endurance Data (Cycling & Rowing)
Power-to-weight calculator
Work out your watts per kilogram and FTP-relative W/kg from power and body mass, in kg or lb.
Use Tool → Coggan 7-ZoneFTP training zones calculator
Turn your FTP into the seven Coggan power zones as watt ranges — a reference, not a prescription.
Use Tool → Physics ModelCycling speed from power
Estimate road speed from power using the full physical model, with the CdA/Crr error band stated honestly.
Use Tool → Concept2Rowing split calculator
Convert between 500m split, watts and pace using Concept2's published relationship.
Use Tool → Tanaka · KarvonenHeart rate zones calculator
Estimate HRmax and Karvonen heart-rate zones — an educational reference with the full health note.
Use Tool →Racquet & Scoring Systems
Elo rating calculator
Compute the expected score and the rating change a head-to-head result produces, with an adjustable K-factor.
Use Tool → Fantasy ScoringFantasy points calculator
Total fantasy points from a stat line under an editable scoring scheme — no projections or rankings.
Use Tool →Standards & Benchmarks
What is ScoreIndexer?
ScoreIndexer is a collection of free sports scoring, handicapping and performance-equivalence calculators — each one built on a published governing-body formula, with the source document, version year and date we checked it printed on every page.
Who it’s for
Club golfers working out their Handicap Index. Runners converting pace to finish time. Powerlifters comparing Wilks, DOTS and IPF GL scores. Swim coaches reading World Aquatics points tables. Cricket fans calculating net run rate during a tournament. Cycling enthusiasts estimating speed from power output. Anyone who wants the answer and the working that produced it — not just a number with no explanation.
Every tool on this site is designed so that you can see, step by step, exactly how the result was calculated. We believe that a calculator is only useful if you can trust it, and you can only trust it if you can verify it.
How we’re different
Most sports calculators give you a number and nothing else. ScoreIndexer goes further: every tool names the governing body whose formula it implements, states the document edition and version year, declares its assumptions and approximations, and explains what the result does and does not mean. We never present estimates as official figures, and we never mix in betting, predictions or proprietary algorithms.
Published formulas only. We implement calculations that appear in named documents from the USGA, R&A, World Athletics, WMA, IPF, World Aquatics, ICC, USBC and Concept2. We do not reverse-engineer proprietary systems.
Every source cited. Each calculator and article names the source document, links to it where publicly available, and records the date the editorial team last checked the reference. Our Methodology page details the full verification process.
Version and date checked. Scoring tables, coefficient sets and rule editions change. We state which version each tool uses and when we last confirmed it against the source, so you always know whether you are looking at current or superseded numbers.
No betting or predictions. There are no odds, implied-probability, staking or expected-value pages anywhere on this site. No match, race or season predictions. No news, no results, no fixtures. We compute — we do not speculate.
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.
Running
How accurate is the Riegel predictor?
Where the 1.06 exponent came from, and the distances and durations it breaks down over.
Swimming
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.