Age-Graded Performance Calculator
Age grading lets runners of any age compare their performances on a level field. It works by applying an age factor, drawn from World Masters Athletics tables, to your actual race time. The factor adjusts your result to what an open-class athlete of the same standard might have run, which removes the natural slowdown that comes with age. This calculator takes your actual finish time, the age factor for your age, sex and distance, and an open-class standard time for that event, then returns two numbers: your age-graded time and your age-grade percentage. The age-graded time is your actual time multiplied by the factor; the percentage compares that adjusted time against the open standard, where 100 percent is world-class and higher percentages mean stronger performances. Enter an actual 5K time of 25 minutes, an age factor of 0.9000 and an open standard of 19 minutes 30 seconds, and the tool returns an age-graded time of 22 minutes 30 seconds and an age grade of about 86.67 percent. Because the factor and the standard come from published tables, you supply them as editable inputs and the calculator performs the arithmetic deterministically. The exact formula and a worked example that reconciles to the calculator appear in full below.
Age grading multiplies your time by an age factor, then compares it to an open standard: age-graded time = actual time x factor. A 25:00 5K with a 0.9000 factor gives a 22:30 age-graded time and about 86.67% against a 19:30 standard.
Age-graded performance formula
age-graded time = actual time x age factor
age grade % = (open standard / age-graded time) x 100
age factor and open standard come from WMA published tables
Your actual time is multiplied by the age factor to give an age-graded time. That adjusted time is then compared with the open-class standard for the event, expressed as a percentage where 100 percent is world-class.
Worked example
An actual 5K time of 25 minutes, an age factor of 0.9000 and an open standard of 19 minutes 30 seconds.
- Actual time = 25 minutes = 1,500 seconds
- Age-graded time = 1,500 x 0.9000 = 1,350 seconds = 22 minutes 30 seconds
- Open standard = 19 minutes 30 seconds = 1,170 seconds
- Age grade = (1,170 / 1,350) x 100 = 86.67%
These are the calculator's default inputs, so the result above matches the widget exactly.
Age-Graded Performance Calculator: frequently asked questions
What is age grading in running?
Age grading adjusts a race time for the runner's age and sex using World Masters Athletics factors, so a 60-year-old and a 30-year-old can be compared fairly. It produces an age-graded time and an age-grade percentage where 100 percent is world-record class.
Where do the age factor and standard come from?
Both come from World Masters Athletics age-grading tables, which list a factor for each age, sex and distance, and an open-class standard for each event. Because those values are published tables rather than a formula, this calculator takes them as editable inputs.
What is a good age-grade percentage?
As a rough guide, above 60 percent is regional class, above 70 percent is national class, above 80 percent is world class, and above 90 percent is approaching world-record level. The exact thresholds vary by source, so treat them as a guide.
How is age-graded time different from age grade?
Age-graded time is your actual time multiplied by the age factor, giving a single adjusted time. Age grade is that adjusted time compared with the open standard, expressed as a percentage. One is a time, the other is a score.
Is competing at older ages safe?
The US Centers for Disease Control and Prevention notes that regular activity benefits people of all ages, and that older adults should build intensity gradually and check with a clinician where needed. Age grading is a motivation tool, not medical advice.
Official sources
- Physical activity and health guidance: US Centers for Disease Control and Prevention (CDC). As at 25 June 2026.
Reviewed by the CalculatorHub team, edited by James Graham, 25 June 2026. See our methodology. This is general information, not financial, tax, legal or investment advice.