Bike Fit Calculators
Frame sizing, saddle height, reach, stack and positioning calculators.
Frame Size Calculator
Find the right frame size based on your body measurements.
Saddle Height Calculator
Calculate optimal saddle height from inseam measurement.
Handlebar Reach Calculator
Determine ideal handlebar reach from torso and arm length.
Stack and Reach Calculator
Compare frame stack and reach between different bike sizes.
Stem Length Calculator
Calculate the stem length needed for your ideal reach.
Crank Length Calculator
Find optimal crank length based on leg length and riding style.
Seat Tube Angle Calculator
Calculate effective seat tube angle from saddle position.
Saddle Setback Calculator
Determine saddle fore-aft position relative to the bottom bracket.
Handlebar Width Calculator
Find the right handlebar width from shoulder measurement.
Cleat Position Calculator
Calculate optimal cleat placement on cycling shoes.
10 free calculators in Bike Fit
Understanding Bike Fit for UK Cyclists
A proper bike fit is one of the most important investments any cyclist can make, whether you are commuting through central London, tackling sportives in the Yorkshire Dales, or training for British Cycling time trials. Poor positioning is a leading cause of knee pain, lower back discomfort, and numbness on long rides — issues that become particularly noticeable on the UK's often rough and poorly surfaced roads. Our frame size calculator and saddle height calculator use your body measurements in centimetres to recommend starting positions based on widely accepted fitting methodologies.
Getting your reach and stack dialled in is essential for both comfort and aerodynamic efficiency. The stack and reach calculator lets you compare geometry across different bike sizes, while the stem length calculator helps fine-tune your cockpit without needing a full professional refit. For riders using clipless pedals, the cleat position calculator provides a starting point that can prevent hotfoot and knee tracking issues over longer distances.
While these calculators give you an excellent foundation, many UK bike shops and organisations like Cycling UK recommend a professional bike fit for serious riders — especially those covering high weekly mileage or recovering from injury. Use our tools to understand your measurements before a fitting session, or to make informed adjustments between visits to your local fitter.