A runner may need to improve calf strength for training progression. A field sport athlete may need a clearer measure of seated calf loading capacity. A gym client may be progressing lower-limb strength and wants a simple way to track calf strength over time.
The Seated Calf Raise Repetition Maximum Test provides a controlled way to assess calf strength using a standardised seated calf raise machine setup. Rather than requiring a true 1RM attempt, the test can be performed using a submaximal repetition maximum, such as a 3RM, 5RM, 8RM or 10RM. The load and reps are then entered into Measurz to calculate the estimated 1RM.
The result is useful for strength tracking, but it should not be interpreted as a complete measure of calf function, Achilles tendon capacity, sprint performance, jump performance, running capacity, injury risk or return-to-sport readiness.
The Seated Calf Raise Repetition Maximum Test measures the heaviest load a client can lift for a defined number of repetitions using a seated calf raise machine.
Depending on the protocol, this may be a 3RM, 5RM, 8RM, 10RM or another repetition maximum. The repetition target should be clearly recorded.
In Measurz, the professional records the load and completed repetitions. Measurz then calculates the estimated 1RM from that result. This estimated 1RM can be used to monitor progress over time and guide loading decisions.
If the client performs a true single-repetition maximum, the result should be labelled as a directly measured 1RM. If the result is calculated from a submaximal load and repetitions, it should be labelled as an estimated 1RM.
This test is used to assess seated calf raise strength and track strength changes over time.
It may be useful for athletes, runners, field sport clients, gym clients and lower-limb strength programmes where calf strength is an important monitoring variable.
It is especially useful when the professional wants a strength estimate without requiring a true maximal 1RM attempt. A submaximal RM test can be more practical for many clients while still giving a useful estimated 1RM through Measurz.
The test measures seated calf raise performance under the selected machine setup.
It may reflect:
Machine-based plantar-flexion strength
Soleus-biased calf loading capacity
Load tolerance
Control through the selected ROM
Pain or symptom response
Estimated 1RM progress across training blocks
Training load progression
It does not measure Achilles tendon capacity, calf endurance, standing calf function, sprint performance, jump performance, ankle stiffness, foot control, balance, injury risk or sport readiness on its own.
This test may be useful for runners, field sport athletes, jumping athletes, gym clients, lower-limb strength clients and anyone completing calf-focused strength training.
It may not be appropriate when the machine setup causes pain, the client cannot stabilise safely, the ankle cannot move through a repeatable ROM, symptoms increase during loaded plantar flexion, or the client is not ready for maximal or near-maximal repetition testing.
Seated calf raise machine
Load stack or plates
Adjustable knee pad, foot platform and seat position
Measurz for recording load, reps and estimated 1RM
Optional metronome
Optional video
Optional foot-position marker if the machine setup allows
Set the machine
Adjust the seat, knee pad, foot platform and lever position. Record these settings so the setup can be repeated.
Position the client
Place both feet on the platform with the balls of the feet supported and the heels free to move. The knees should remain under the pad and the feet should stay aligned throughout the movement.
Choose the repetition target
Select the repetition maximum target, such as 3RM, 5RM, 8RM or 10RM. Use the same target for retesting where possible.
Define valid ROM
Set a clear start and finish range. A valid repetition should include controlled lowering into the selected dorsiflexion range and a consistent rise into plantar flexion without bouncing or shortening the movement.
Warm up
Complete light warm-up sets. Increase load gradually before testing.
Perform the test
Ask the client to complete the selected repetition maximum with controlled movement and the defined ROM.
Stop the attempt
Stop when the client reaches the target reps, cannot complete another valid rep, loses ROM, uses unacceptable compensation, reports limiting symptoms or cannot maintain control.
Record the maximum successful set
The score is the heaviest load completed for the target repetition range with acceptable technique and ROM.
Enter load and reps into Measurz
Record the completed load and repetitions in Measurz. Measurz calculates the estimated 1RM from the entered result.
Record the load, reps and exact seated calf raise setup. Measurz uses the completed load and reps to calculate the estimated 1RM.
The estimated 1RM should be interpreted as an estimate, not the same as a directly tested 1RM. If a true 1RM was performed, label it as directly measured. If the result comes from a submaximal load and repetitions, label it as estimated.
Interpretation should include:
Absolute load
Completed repetitions
Estimated 1RM
ROM
Machine setup
Tempo
RPE
Pain or symptoms
Compensations
Previous baseline
A lower estimated 1RM may suggest reduced machine-based seated calf raise strength under the tested setup, but it does not identify the cause. Pain, fatigue, ankle ROM, machine fit, foot placement, confidence, recent training and tendon symptoms may all influence the result.
No universal normative value should be applied across machines and populations. Seated calf raise results vary by machine design, knee angle, foot platform, lever arm, ROM, body size, training history and whether the 1RM is directly measured or estimated.
Use baseline comparison and progress across sessions as the primary benchmarks.
If a single-leg version is also tested, side-to-side comparison can be useful, but it should not be treated as a strict pass/fail rule. A noticeable difference between sides should be interpreted alongside symptoms, sport or training demands, ROM, calf endurance and related lower-limb tests.
Common errors include changing seat settings, changing knee pad position, using inconsistent ROM, bouncing out of the bottom position, shortening the top range, allowing the feet to slide, using momentum, changing tempo, testing while fatigued and comparing results across different machines.
A common recording error is failing to distinguish between a directly measured 1RM and an estimated 1RM. When load and reps are entered into Measurz, the result should be described as an estimated 1RM unless a true 1RM was directly tested.
The main limitation is that the test measures machine-based seated plantar-flexion strength only. It does not fully assess calf endurance, standing calf strength, Achilles capacity, sprinting, jumping, running performance or lower-limb function.
Use this test to monitor seated calf strength, guide training loads and track response to calf-strengthening or lower-limb training programmes.
The estimated 1RM can help track progress across training blocks, adjust loading and compare results across retests when the same setup is repeated.
It is most useful when interpreted alongside calf endurance, standing calf strength, ankle ROM, hop testing, sprint exposure, jump testing and symptom monitoring.
Record machine type, seat setting, knee pad setting, foot position, ROM, load, reps, RM target, estimated 1RM, RPE, pain score, symptom location, compensation notes, reason for stopping and retest date.
Useful notes include shortened ROM, heel drop depth, poor top-range lift, bouncing, foot slip, cramping, Achilles discomfort, pain-limited rep, fatigue-limited attempt, tempo change or setup change.
The key Measurz workflow is:
Enter the completed load
Enter the completed reps
Review the estimated 1RM calculated by Measurz
Record setup, ROM, symptoms, RPE and compensations
Use the same protocol for retesting
It measures machine-based seated plantar-flexion strength.
It provides useful soleus-biased calf strength information because the knee is flexed, but it does not isolate the soleus completely.
The professional enters the completed load and reps into Measurz. Measurz uses this information to calculate the estimated 1RM.
Not unless the client completed a true 1RM. If the result is based on load and multiple repetitions, it should be labelled as an estimated 1RM.
Only cautiously. Machine design, lever arm, knee pad position and ROM can change the score.
Yes. Pain score, symptom location, ROM and whether symptoms limited the result should be recorded.
No. A 3RM, 5RM, 8RM or 10RM may be more appropriate for many clients. Measurz can use load and reps to estimate 1RM.
The test measures seated calf raise repetition maximum performance.
Measurz calculates the estimated 1RM from the recorded load and reps.
Machine setup and ROM must be repeated.
Do not treat an estimated 1RM as the same as a directly measured 1RM.
Do not treat the result as a complete calf, Achilles or running profile.
Record load, reps, setup, ROM, symptoms and RPE in Measurz.
Grgic, J., Lazinica, B., Schoenfeld, B. J., & Pedisic, Z. (2020). Test–retest reliability of the one-repetition maximum strength assessment: A systematic review. Sports Medicine - Open, 6, 31. https://doi.org/10.1186/s40798-020-00260-z
Hébert-Losier, K., Wessman, C., Alricsson, M., & Svantesson, U. (2017). Updated reliability and normative values for the standing heel-rise test in healthy adults. Physiotherapy, 103(4), 446–452.
Suchomel, T. J., Nimphius, S., Bellon, C. R., & Stone, M. H. (2018). The importance of muscular strength: Training considerations. Sports Medicine, 48(4), 765–785.
