Find your flexibility rating, percentile rank, and personalized tips based on your sit and reach test score.
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Enter your age, biological sex, and the distance you reached during a standard sit-and-reach test. You can input in centimeters or inches, and use the slider or type directly. Click Calculate to instantly see your flexibility rating, percentile rank, and a color-coded zone chart showing where you land compared to others your age.
The sit and reach test is one of the most widely used field tests for lower-back and hamstring flexibility — two areas that directly affect injury risk, posture, and athletic performance. Poor hamstring flexibility is linked to lower-back pain, which affects roughly 80% of adults at some point in their lives. Athletes in sports like running, cycling, and soccer are especially vulnerable.
For a 35-year-old male who sits at a desk eight hours a day, a score of +5 cm might sound fine — but it actually places him in the "Below Average" category, suggesting tight hamstrings that could contribute to chronic lower-back strain. A sedentary 50-year-old woman scoring +12 cm, on the other hand, is in the "Good" range and significantly reduces her fall-injury risk.
Physical therapists, coaches, and personal trainers regularly use this test in fitness assessments, rehabilitation programs, and pre-season screenings. Even a 10-minute daily stretching routine can meaningfully improve your score within 4–6 weeks.
The standard sit-and-reach test measures how far (in cm or inches) you can reach past — or short of — your toes while seated with legs straight. The box edge (toes position) equals 0. Positive scores mean you reached past your toes; negative scores mean you fell short.
Your score is then compared against published normative data segmented by age group and biological sex (sourced from the Canadian Fitness and Lifestyle Research Institute and ACSM guidelines). Each age/sex combination has six rating categories: Very Poor, Poor, Below Average, Average, Good, and Excellent. Percentile ranks are estimated from these normative distributions.
Formula used: Score (cm) → lookup normative table for [age group × sex] → assign category and percentile band
For adult men aged 20–29, a score of +15 cm or above is rated "Excellent," while 10–14 cm is "Good." For women the same age, +20 cm or above is "Excellent." Scores drop slightly with age, so "Average" for a 50-year-old male is roughly 5–9 cm — lower than for a 25-year-old.
For most people, retesting every 4–8 weeks provides enough time to see meaningful change from a stretching program. If you're working with a physical therapist, they may retest every 2–3 weeks. Track your score over time to stay motivated and adjust your program.
Yes — flexibility generally peaks in the mid-20s and declines gradually, mainly due to reduced elastin in connective tissue and decreased activity levels. However, consistent stretching can significantly slow this decline. Many 60-year-olds who stretch regularly outperform sedentary 30-year-olds.
The V-sit test uses a different reference baseline (heel line = 23 cm on the ruler), so raw numbers aren't directly comparable. This calculator uses the standard box-test protocol where toes = 0. If you have a V-sit score, subtract 23 cm from your reading to approximate the box-test equivalent before entering it here.