Age-Graded Performance Calculator
Age-Graded Performance Calculator
The age-factored performance World Masters Athletics defines: your time times the published age factor, rounded the way the rulebook rounds it. The factor comes from you, because it is a published table and an approximation would be worst at the ages that use it most.
Age-factored performance
Time × age factor13.12 seconds, an age factor of 0.9031, fully automatic timing — World Masters Athletics’ own example
Formula
age-factored performance = ceil(corrected time × age factor, to the next 0.01 s)
age grade = open-class standard ÷ age-factored performance × 100
- × the age factor
- World Masters Athletics, 2023 Rulebook Appendix B: “the actual performance in each event is multiplied by the appropriate Age Factor to arrive at an Age Factored Performance”, and “use the full, four place number for Age Factoring”
- ceil, not round
- the same Appendix: “rounding is done so as to never give artificial aid to the performer”, so a running event goes “up to the higher one hundredth of a second” and a throw or jump “down to the shorter centimetre”. The difference shows at 11.841, which becomes 11.85 here and 11.84 under rounding
- +0.24 and +0.14
- WMA’s hand-timing corrections, before the factor: “50 through 300 meters add 0.24 seconds to the hand time”, “400 meters add 0.14 seconds”, “longer than 400 meters add nothing”
- the factor is YOUR number
- a published table by age, sex and event. This calculator has no table interpolation, and a fitted stand-in would be least accurate at the extremes of age — precisely who uses age grading
- the percentage is a convention
- Appendix B says nothing about an age-grade percentage. The row here is the open-class standard over the factored performance, which is what the age-grading calculators do
Worked example
13.12 seconds, an age factor of 0.9031, fully automatic timing — World Masters Athletics' own example
The timing is fully automatic, so no correction is applied and the corrected time is 13.12 s
13.12 × 0.9031 = 11.848672, the figure WMA Appendix B prints for this example to the last digit, and rounded up to the next hundredth 11.85 — what the Appendix says to "look up in the standard IAAF Combined Events Scoring Table"
The factor has removed 1.2713 seconds from the time
Against an open-class standard of 9.58 s, the age grade is 9.58 ÷ 11.85 × 100 = 80.84%
Switch the timing to hand timed over 50 to 300 m and the corrected time becomes 13.36, the factored performance 12.07 and the age grade 79.37%
Set the factor to 1.0000 and the factored performance is the time itself: the open-class case, where there is nothing to factor
World Masters Athletics’ own worked example, step by step
| Step | Figure | Where it comes from |
|---|---|---|
| Performance | 13.12 s | WMA 2023 Appendix B worked example |
| Age factor | 0.9031 | the same example; “use the full, four place number” |
| Product | 11.848672 | printed in the Appendix to this exact digit |
| Rounded up to 0.01 s | 11.85 | “11.848672 rounded up equals 11.85” |
| Open-class standard | 9.58 s | supplied by the reader, not by the Appendix |
| Age grade | 80.84% | convention, not a WMA definition |
The hand-timing corrections, and what they cost
| Event length | Correction | 13.12 becomes | Factored at 0.9031 | Age grade vs 9.58 |
|---|---|---|---|---|
| Fully automatic | none | 13.12 | 11.85 | 80.84% |
| 50 m to 300 m, hand timed | +0.24 s | 13.36 | 12.07 | 79.37% |
| 400 m, hand timed | +0.14 s | 13.26 | 11.98 | 79.97% |
| Longer than 400 m, hand timed | none | 13.12 | 11.85 | 80.84% |
The factor the page asks you for, and why it has to
This page is about athletics — track and field, and road running — whose competition rules, technical rules and scoring tables are published by World Athletics, the body that was the IAAF until 2019. Where a figure below belongs to a particular edition of those rules, the edition is named beside it, because World Athletics revises them and a number quoted without its edition will be wrong for somebody.
Age grading answers a question a finishing time cannot: how good is this performance for somebody of this age and sex, in this event. World Masters Athletics’ 2023 Appendix B states the arithmetic in one sentence — “the actual performance in each event is multiplied by the appropriate Age Factor to arrive at an Age Factored Performance” — and works an example: 13.12 seconds times .9031 gives 11.848672, which “rounded up equals 11.85”. Both numbers are the defaults here.
The number this page cannot look up for you, it asks you for. This calculator has no table interpolation of any kind, and a curve fitted to stand in for a published table is worst at its extremes — exactly where the answer changes anything. So where a figure comes from a published table, the table’s own value is an input: a fitted approximation baked into the page would be a worse number pretending to be a better one.
So the factor is an input, which is the honest shape rather than a limitation dressed up: the tables run by age, sex and event, have been in their current form since 1 January 2023, and the British Masters Athletic Federation names Howard Grubb’s calculator as the authoritative implementation of them. What this page adds is the arithmetic done the way the rulebook specifies it, including the two details that are easy to get wrong.
The first is the rounding direction: the factored performance goes UP to the next hundredth of a second, not to the nearest, because “rounding is done so as to never give artificial aid to the performer” — the same principle that sends a throw or a jump DOWN to the shorter centimetre. The unrounded product is printed beside the rounded one so the effect is visible. The second is hand timing, which gets its correction BEFORE the factor; the table below has WMA’s figures and why they are not a World Athletics conversion.
One careful distinction. The age-grade percentage runners quote — “an 80% age grade” — is not defined in Appendix B, which defines the factored performance and stops there. The percentage row here divides an open-class standard you supply by the factored performance, the convention the age-grading calculators use. If the percentage is what you intend to quote, take it from Grubb’s calculator, which implements the tables and the standards together; what this page gives you with a governing body behind it is the factored performance.
Where the line runs between this page and the health section: health owns the athlete’s body and this page owns the race. A figure derived from a person — aerobic capacity, a heart-rate zone, a body composition — is there, at the VO2 max calculator and the target heart-rate zones calculator. A figure derived from a clock and a distance is here. Nothing on this page prescribes a training pace or a heart rate, or makes any physiological claim.
For a comparison across distances rather than ages, the race time predictor uses Riegel’s fitted exponent — a useful contrast, since there the model is a fit and here it is a table. For the points a factored performance gets looked up against, the combined events scoring calculator computes them from the published closed form.
Frequently asked questions
How is an age-graded performance calculated?
Multiply the performance by the age factor for your age, sex and event, then round up to the next hundredth of a second. WMA’s 2023 Appendix B works the example: 13.12 × .9031 = 11.848672, rounding up to 11.85. A hand time gets its correction before the factor.
Why does this page ask me for the age factor?
Because the factors are a published table and this calculator has no table interpolation of any kind. A curve fitted to stand in would be least accurate at the extremes of age, which is exactly who uses age grading, so asking for the table’s own value is the better answer.
Why is the result rounded up rather than to the nearest hundredth?
Because WMA Appendix B says so, and gives its reason: “rounding is done so as to never give artificial aid to the performer”. Running events go up to the higher hundredth, throws and jumps down to the shorter centimetre.
Is the age-grade percentage an official figure?
Not from WMA Appendix B, which defines the age-factored performance and never mentions a percentage. The row here divides an open-class standard you supply by the factored performance, the convention the age-grading calculators use. The BMAF names Howard Grubb’s calculator as the authoritative implementation of the WMA tables, and a percentage you intend to quote should come from there.
What do the hand-timing corrections add?
0.24 seconds from 50 to 300 metres, 0.14 at 400 and nothing beyond, per WMA 2023 Appendix B, applied before the factor. Not a World Athletics conversion: World Athletics does not ratify a hand time in a sprint.
Related calculators
References
- World Masters Athletics. 2023 WMA Rulebook, Appendix B: Scoring of WMA Combined Events, Age Grading Tables and Parameters, 2023 Edition (read 12 Oct 2026; about 80,000 characters, factor tables readable as text though some field-event column headers were misaligned, and no factor value is quoted from them here). “The actual performance in each event is multiplied by the appropriate Age Factor to arrive at an Age Factored Performance”; “use the full, four place number for Age Factoring”; and the worked example “13.12 times .9031 Age Factor equals an Age Factored Performance of 11.848672”, which “rounded up equals 11.85 to look up in the standard IAAF Combined Events Scoring Table”. Rounding: “the general rule is that rounding is done so as to never give artificial aid to the performer”, running events “up to the higher one hundredth of a second” and throws and jumps “down to the shorter centimetre”. Hand-timing corrections, applied before the factor: “50 through 300 meters add 0.24 seconds to the hand time”, “400 meters add 0.14 seconds”, “longer than 400 meters add nothing”. Its parameter tables give “100m a=25.4347 b=18s c=1.81” and “High Jump a=1.84523 b=75cm c=1.348”, matching the IAAF 2001 tables exactly.
- British Masters Athletic Federation. “Age Graded Standards”, bmaf.org.uk (read 12 Oct 2026). “Age-Grading is a way of measuring your athletics performance taking into account your age and sex”, and “the authoritative calculator of age-grading in accordance with the WMA rules was originally developed by Howard Grubb”, with the current tables in force since 1 January 2023. About 11,000 characters of page and roughly 2,000 of article: it does NOT state the arithmetic of an age-grade percentage, and this page says so rather than attributing one to it.
- World Athletics. Technical Rules (Book C, C2.1), copy read 12 Oct 2026 carrying amendments effective 1 January 2022; about 60,000 characters of readable text, truncated before the combined-events material. A time is recorded “to the next longer 0.01 second” for races up to and including 10,000m, and a hand time “to the next longer 0.1 second” — in both cases away from the athlete rather than to the nearest.