Observed Function Calculator
Measured Function Score
Convert your real-world validation measures into a single observed-function score so you can compare measured performance against the modeled Energy Score. This is a practical tracking score, not a clinically validated scale.
Inputs
Enter Measured Results
Use one consistent protocol and home setup so this score becomes useful for repeat tracking, not just a one-off estimate.
Recommended Grip Device
Handeful digital dynamometer
If you are using the grip-strength version of this calculator, a simple standardized option is the Handeful Grip Strength Tester. It fits the workflow on the validation page and makes repeated home or clinic measurements easier to keep consistent.
Pick the protocol version you actually used. Do not mix versions across visits in the same study if you can avoid it.
The normal path assumes you are measuring now. Switch to a custom timestamp only when you need to backfill or enter a past measurement.
Used to apply sex-specific scales for both grip strength and sit-to-stand performance.
Use a dynamometer. Preferred setup: seated, feet flat, back supported, shoulder neutral, elbow near 90 degrees, forearm neutral. Do one practice squeeze if needed, then perform 3 maximal trials per hand with 15 to 30 seconds rest. Enter the best dominant-hand value. You can also enter the non-dominant hand to reflect bilateral balance.
Required when using the grip protocol. The dominant hand anchors the grip score using sex-specific thresholds and top-end scaling.
Optional. Matching hands scores slightly better than a single-hand entry, while larger left-right gaps reduce the grip component.
Use a stable chair without wheels, ideally about 17 to 18 inches high. Start seated fully back with feet flat. Preferred method: arms folded across chest if safe. On go, stand up fully and sit down fully 5 times as quickly and safely as possible. Stop timing when fully standing on the 5th repetition.
Standard test guide
Lower is better. Faster times approach the top score asymptotically using sex-specific scaling, so male and female performance are not forced onto the exact same curve.
Choose this based on how much the person used their hands during the 5x sit-to-stand. No support means arms folded or no meaningful hand use. Light means a brief touch or single push-off. Moderate means repeated push-off, steady hand support, or clearly assisted completion.
Use this when the person holds the chair, pushes off the seat, or otherwise uses arm support. More support lowers the sit-to-stand score.
Use the same fatigue survey each visit. A practical option is the Fatigue Severity Scale. This baseline fatigue input should represent the person's recent usual fatigue burden, not how tired they feel immediately after the grip test or the 5x sit-to-stand. Ideally collect it before performance testing, especially if exertion temporarily worsens symptoms. Convert the raw survey result into a 0 to 100 burden score before entering it here.
Use a baseline or recent usual-state fatigue score, preferably recorded before the grip and sit-to-stand tests. Do not use immediate post-test exhaustion here. 0 means no fatigue burden and 100 means maximal fatigue burden.
Enter how fatigued the person feels immediately after completing the 5x sit-to-stand using the same 0 to 100 burden scale. This is meant to capture exertional cost or post-test fatigue, separate from the general baseline fatigue burden used in the weighted Measured Function Score.
Use the same framing each visit and record it right after the 5x sit-to-stand. 0 means no fatigue after the test and 100 means maximal post-test fatigue.
Grip interpretation note:
This calculator now uses raw grip strength in pounds.
The dominant hand is required for the grip protocol. The non-dominant hand is optional and adjusts the grip component for bilateral symmetry.
If both hands score the same, the grip component is slightly higher than a single-hand entry at that same level. As the two hands drift further apart, the grip component falls monotonically, and a large mismatch scores worse than entering only the dominant hand.
For practical interpretation, it anchors "low strength" near common sex-specific cut points used in the literature:
women around `35-40 lbs`, men around `60-65 lbs`.
Both grip and sit-to-stand now use asymptotic scoring with sex-specific scales. Male grip scaling uses a higher ceiling than female grip scaling, and sit-to-stand uses sex-specific top benchmarks and floor values.
Fatigue still needs to be converted to a 0 to 100 burden score.
This calculator now uses raw grip strength in pounds.
The dominant hand is required for the grip protocol. The non-dominant hand is optional and adjusts the grip component for bilateral symmetry.
If both hands score the same, the grip component is slightly higher than a single-hand entry at that same level. As the two hands drift further apart, the grip component falls monotonically, and a large mismatch scores worse than entering only the dominant hand.
For practical interpretation, it anchors "low strength" near common sex-specific cut points used in the literature:
women around `35-40 lbs`, men around `60-65 lbs`.
Both grip and sit-to-stand now use asymptotic scoring with sex-specific scales. Male grip scaling uses a higher ceiling than female grip scaling, and sit-to-stand uses sex-specific top benchmarks and floor values.
Fatigue still needs to be converted to a 0 to 100 burden score.
Output
Measured Function Score
This is the observed-function companion to the Energy Score. It emphasizes practical repeatability over perfect clinical exhaustiveness.
Current Score
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Enter results to calculate
As you update the protocol version, performance measures, and baseline fatigue burden, the score recalculates instantly so you can compare visits more cleanly.
Upper Body Score
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Lower Body Score
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Component Scores
Applied Weights