Grip Strength Calculator
Measure your grip strength and see how it compares to age- and gender-based norms. Get your predicted grip strength, percentage of the norm, relative strength (% body weight), and health insights , all for free.
What Is Grip Strength?
Grip strength is the maximal force you can generate with your hand and forearm muscles when squeezing a hand dynamometer. It's a simple, non-invasive measure that has become one of the most powerful indicators of overall muscular fitness and even long-term health.
Research has shown that grip strength is a strong predictor of:
- All-cause mortality , lower grip strength is associated with higher mortality risk, independent of other factors.
- Cardiovascular health , grip strength asymmetry (a large difference between hands) is linked to higher cardiovascular mortality risk.
- Sarcopenia and frailty , grip strength is a key diagnostic criterion for age-related muscle loss.
- Overall physical function , it correlates with mobility, independence, and quality of life in older adults.
This calculator compares your measured grip strength to an age- and gender-specific predicted value so you can see how you stack up against the population average.
How Does the Grip Strength Calculator Work?
The calculator uses the following validated formula to predict average grip strength:
Predicted Grip Strength (kg):
Predicted = 62.68 − (0.5179 × Age) + (17.14 × Gender)
Gender: 1 = male, 0 = female
Percentage of Predicted Norm:
% of Norm = (Measured ÷ Predicted) × 100
Relative Grip Strength (% Body Weight):
Relative Strength = (Grip (kg) ÷ Body Weight (kg)) × 100
The predicted value represents the average grip strength for someone of your age and gender. A percentage above 100% means you are stronger than the age- and gender-matched average; below 100% means you are below average.
Why Use This Grip Strength Calculator?
- Age- and gender-adjusted comparison: See how you compare to people like you, not just raw numbers.
- Relative strength: Grip strength as a percentage of body weight gives a fairer picture for different body sizes.
- Health insights: Grip strength is a proven health marker , tracking it can help you monitor muscle health over time.
- Unit flexibility: Enter grip strength in kg or lbs, and body measurements in metric or imperial.
- Visual chart: Compare your measured strength to the predicted average at a glance.
- Free & Private: No registration, no data storage.
Understanding Your Grip Strength Category
- Weak (< 80% of predicted): Below the age- and gender-matched average. May indicate muscle weakness or a need for strength training.
- Normal (80–120% of predicted): Within the expected range for your age and gender.
- Strong (> 120% of predicted): Above the age- and gender-matched average. Indicates good muscular strength.
Note: These categories are relative to the predicted average and are intended as a general guide. Clinical grip strength thresholds (e.g., for sarcopenia diagnosis) use absolute cutoffs that vary by population and protocol.
How to Measure Grip Strength Correctly
For accurate and repeatable results, follow a standardized protocol:
- Use a calibrated hand dynamometer (e.g., Jamar).
- Sit with your arm at a right angle (elbow ~90°), forearm neutral, and wrist in a neutral position.
- Squeeze as hard as possible for 3–5 seconds.
- Perform 2–3 trials per hand, alternating hands, with 15–60 seconds rest between trials.
- Record the best (or average) score for the dominant hand.
Keep the testing conditions consistent each time you measure, so you can track changes reliably.
❓ Grip Strength Calculator FAQ
What is a good grip strength?
It depends on your age and gender. The predicted formula in this calculator gives the average for your demographic. Generally, a grip strength at or above the predicted value is considered good. For reference, average peak grip strength is around 49.7 kg for males and 29.7 kg for females at ages 30–39.
How is predicted grip strength calculated?
The calculator uses the formula: Predicted = 62.68 − (0.5179 × Age) + (17.14 × Gender), where gender = 1 for male and 0 for female. This gives the expected average grip strength for your age and gender.
What does "% of predicted norm" mean?
It compares your measured grip strength to the predicted average for your age and gender. 100% means you are exactly at the predicted average. Above 100% means you are stronger than average; below 100% means you are below average.
What is relative grip strength?
Relative grip strength is your grip strength divided by your body weight, expressed as a percentage. It adjusts for body size and can be a better indicator of muscle quality than absolute strength, especially in people with higher body weight.
Is grip strength a good indicator of overall health?
Yes. Numerous studies show that grip strength is a strong predictor of all-cause mortality, cardiovascular risk, and physical disability. It is often used as a vital sign in clinical settings because it reflects overall muscular and neurological health.
How does grip strength change with age?
Grip strength typically peaks between ages 30 and 39, then declines gradually with age. The decline is slightly larger in men than in women during middle adulthood.
Should I measure my dominant or non-dominant hand?
Most norms are based on the dominant hand. The calculator allows you to select which hand you tested so the comparison is appropriate. If you test both, use the dominant hand for the main comparison, or use the average of both hands if that is your preference.
What is a significant difference between hands?
A difference of 4–5 kg between hands may be associated with increased health risks, and a difference of 10 kg or more is linked to substantially higher all-cause and cardiovascular mortality risk. If you notice a large asymmetry, it's worth discussing with a healthcare professional.
Can I improve my grip strength?
Yes. Grip strength responds well to training. Exercises like farmer's carries, dead hangs, hand grippers, and heavy rows can all improve grip strength. Consistency is key , aim for 2–3 grip-focused sessions per week.
Is this calculator suitable for athletes?
Yes, but keep in mind that athletes (especially in sports like climbing, wrestling, or grip-intensive sports) may have grip strength well above the population average. The relative strength metric (% body weight) may be more meaningful for athletic comparisons.
How do I convert grip strength between kg and lbs?
1 kg = 2.20462 lbs. This calculator lets you enter your grip strength in either kg or lbs, and automatically converts it to metric for the calculations. Body weight and height can also be entered in metric or imperial units.
How often should I measure my grip strength?
Every 4–8 weeks is sufficient for tracking progress. Measure at the same time of day, with the same dynamometer, and using the same protocol each time for consistent results.