Complete Collection of Bike Size Calculators

Trail-optimized sizing with proper standover clearance and geometry for off-road riding. Perfect for XC, trail, and enduro bikes.

Specialized sizing for gravel bikes accounting for riding style, terrain preference, and the unique geometry of gravel frames.

Size your electric bike correctly considering motor type, battery placement, frame style options including step-through designs.

Find the right BMX bike size for race, freestyle, street, or park riding. Uses height and age to recommend top tube length and wheel size.

Triathlon and time trial bike sizing using height, inseam, torso, and arm length. Includes stack/reach targets and race distance adjustments.

Calculate perfect saddle width based on sit bone measurements. Prevents discomfort and improves cycling performance.

Determine optimal stem length for perfect reach and bike handling. Balances comfort and control for any riding style.

Find the perfect handlebar width based on shoulder measurement. Supports road, gravel, and mountain bike bar sizing with different measurement standards.

Calculate ideal frame reach and stack from body measurements. Compare your proportions against common frame sizes for the perfect fit.

Compare two stem, spacer, and angle setups side by side to see exactly how your handlebar reach and height change before buying parts or flipping a stem.

Convert head circumference to the right bike helmet size. Adult, youth, and toddler ranges with a full fit checklist and brand-size notes.

Turn sit-bone width into a target saddle width in mm, plus the closest stocked widths from Specialized, Bontrager, Fizik, Selle Italia, and Ergon.

Convert hand circumference to cycling-glove size. Adult and youth ranges with road vs MTB fit notes.

Calculate and compare gear ratios for any chainring and cassette combination. Compare 1x vs 2x drivetrains, view gear inches, and find overlapping gears.

Determine optimal crank arm length based on inseam measurement and riding discipline. Supports road, mountain, track, and triathlon setups.

Calculate the correct chain length using the Shimano method. Input chainstay length and drivetrain sizes to get exact link count.

Calculate cycling speed from gear ratio and cadence, or find the cadence needed for a target speed. Visualize speed across the full RPM range.

Calculate skid patches for fixed-gear bikes. Find the best gear combinations for maximum tire life with both single-leg and ambidextrous skidding.

Calculate total wheel diameter for any rim and tire combination. Convert between ETRTO, French, and imperial tire size formats.

Calculate spoke lengths for wheel building based on hub and rim measurements. Includes common hub presets and cross pattern selection.

Calculate wheel circumference for bike computer calibration. Supports standard tire presets and custom rim/tire measurements with ETRTO reference table.

Estimate cycling power output in watts based on speed, gradient, weight, and wind. Calculate W/kg and compare against FTP categories.

Estimate calories burned during cycling based on speed, power, duration, and weight. Includes fun food equivalents and activity comparisons.

Calculate gradient percentage and VAM (vertical ascent meters per hour). Compare your climbing performance against benchmarks and famous climbs.

Estimate your bike weight based on frame material, component choices, and build tier. Detailed component-by-component breakdown for road, MTB, gravel, and e-bikes.

Calculate your Functional Threshold Power from 20-minute, 8-minute, or ramp test results. Get personalized training zones and W/kg classification.