All Chester tests: guides and tools
Chester Cycle Test (CCT) calculator
Estimate aerobic capacity (VO₂max) from the Chester Cycle Test using the protocol and calculation described in the Chester Aerobic Fitness Tests manual.
Calculator
Start with the participant details, then enter each completed stage. On a narrow screen, scroll the stage table sideways to see all four columns.
Chester Cycle Test protocol
The Chester Cycle Test is a submaximal incremental cycle-ergometer test. Following a two-minute warm-up, the participant cycles at 50 pedal revolutions per minute. Workload is increased every two minutes while heart rate and rating of perceived exertion (RPE) are monitored.
The manual starts females at 25 W and males at 50 W. The usual next workload is 50 W for females and 100 W for males, followed by the same workload increment at each subsequent two-minute level. For males over 40 who take little or no exercise, the manual specifies a 25 W increment.
The test continues while heart rate is below 80% of age-predicted HRmax and RPE is below 14. If 80% HRmax is reached part-way through a level, the manual allows the level to be completed when RPE is 14 or below and the participant is cycling without discomfort. Stop the test if the participant develops concerning symptoms.
How the result is calculated
The original graphical method plots the exercise heart-rate responses against workload, draws a best-fit line and extrapolates it to age-predicted HRmax (220 − age). The workload at that intersection is the predicted maximum workload.
The manual instructs the tester to draw a best visual straight line through the plotted workload and heart-rate points and extend it to HRmax. This calculator uses a least-squares straight-line fit as a reproducible digital implementation of that graphical step, then converts predicted maximum workload to relative aerobic capacity using the manual’s cycle-ergometry equation:
Predicted VO₂max (mL/kg/min) = [1.8 × (Watts × 6) ÷ body mass (kg)] + 7
The result is therefore an estimate derived from a submaximal test, not a directly measured VO₂max from respiratory gas analysis.
What you need
- A high-specification cycle ergometer capable of accurately setting workload in 25 W increments
- A heart-rate monitor
- An RPE chart
- Body mass in kilograms and participant age
See our cycle ergometer buyer’s guide and Monark cycle ergometer guide for equipment selection and professional testing considerations.
For heart-rate capture, Cartwright Fitness also supplies the Polar H10 chest-strap sensor and Polar Verity Sense optical sensor. For a heart-rate-based submaximal protocol, a chest strap is generally the more appropriate first option where accurate exercise HR capture is the priority.
Pre-test conditions and safety
The Chester manual specifies pre-test health screening and advises against testing where there are doubts about suitability for moderately vigorous activity. It also specifies standardised pre-test conditions and notes that beta-blocker medication can depress heart-rate responses. During testing, stop if the participant shows signs such as over-tiredness or dizziness.
Using the calculator
Enter age, sex and body mass, choose the appropriate workload progression, then enter the stable heart rate recorded near the end of each completed two-minute level. The calculator uses the entered stages to estimate the workload corresponding to age-predicted HRmax and then estimates relative aerobic capacity.
Interpretation
The calculator reports the predicted aerobic capacity and the age- and sex-specific fitness rating published with the Chester Cycle Test datasheet. Use normative categories as descriptive reference values rather than diagnoses or pass/fail standards unless your organisation has separately adopted a defined occupational standard.
Running fitness assessments professionally?
Free calculators are useful for individual tests. Cartwright Assess provides the workflow around repeated assessments, including results, reporting, practitioner access and optional participant records.
Worked calculation and quality checks
Fictional arithmetic example: age 40, body mass 80 kg, and heart rates of 100, 120 and 140 bpm at 50, 100 and 150 W. The fitted line is HR = 0.4 × watts + 80. At predicted HRmax 180 bpm, predicted maximum workload is 250 W. The equation gives 1.8 × (250 × 6) ÷ 80 + 7 = 40.75 mL/kg/min, displayed as 40.8. This example demonstrates the calculation, not clearance to exercise or proof of an individual’s capacity.
Check entries against the original record, use consecutive completed stages and review implausible or irregular heart-rate responses. The manual’s fitness-reference table covers ages 15–65; it does not supply a category for older participants. Its categories are descriptive, and the population/source limitations should be considered before using them.
Use the Chester test comparison guide to distinguish cycle, step and treadmill methods, and the standardisation pack for consistent records and review across practitioners.
Source edition: the supplied resource manual carries a 2016 copyright/update; see printed pages 25–26 and the cycle datasheet on page 48. Follow any current edition-specific instructions for your setting. Reviewed 9 October 2026.
Source
Sykes K. The Chester Aerobic Fitness Tests, Chapter 4: Chester Cycle Test (CCT), including the CCT graphical datasheet and normative table. Cartwright Fitness resource manual.