Find Your Perfect E-Bike Size: Free Online Calculator
Getting the right e-bike size is crucial for comfort, efficiency, and injury prevention. Our professional e-bike sizing calculator uses industry-standard formulas (Hamley method, Italian standard) to recommend your ideal frame size, saddle height, and accessory specifications based on your unique body measurements.
Whether you're shopping for a city commuter e-bike, electric mountain bike (eMTB), or electric road bike, proper sizing ensures optimal power transfer, reduced joint strain, and maximum enjoyment on every ride.
🚴 Ebike Sizing Calculator & Accessory Finder
Professional bike fitting in 60 seconds - Get your perfect frame size, saddle height & accessory recommendations
Based on Industry Standards
Used by 10,000+ Riders
100% Free Tool
📏 How to Measure Your Body Correctly
Step 1: Measure Your Height
Stand barefoot against a flat wall with your heels together. Use a book or ruler to mark the highest point of your head. Measure from the floor to the mark.
Step 2: Measure Your Inseam
Stand with your back against a wall, barefoot, legs 6-8 inches apart. Place a book between your legs, spine up against your crotch (simulate saddle pressure). Measure from the floor to the top of the book spine.
Step 3: Optional - Sit Bone Width
Sit on corrugated cardboard on a hard surface for 30 seconds. Stand up and measure the distance between the center points of the two indentations. This gives your exact sit bone width for optimal saddle selection.
💡 Most important measurement for accurate sizing - see measurement guide above
💡 Affects saddle selection and handlebar reach recommendations
💡 For most accurate saddle width recommendation - see Step 3 in measurement guide
✅ Your Personalized E-Bike Fitting Results
Save these measurements for your next bike purchase or adjustment
🎯 Recommended Frame Size
📏 Saddle Height Setting
Distance from bottom bracket center to top of saddle (along seat tube)
🪑 Saddle Width Recommendation
🖐️ Handlebar Grip Size
Based on your height and hand size correlation
📐 Handlebar Reach (Cockpit Length)
🛒 Perfectly Matched Accessories for Your Size
Curated products that fit your exact measurements
📐 Calculation Methods & Scientific Basis
Frame Size Calculation:
• City/Commuter E-Bikes: Inseam × 0.66 cm (Italian Standard)
• Electric Mountain Bikes: Inseam × 0.226 inches + Reach/Stack geometry (IMBA Standard)
• Electric Road Bikes: Inseam × 0.665 cm (European Standard)
Saddle Height Calculation (Enhanced):
We use the renowned Hamley Method with posture adjustments:
• Upright: Inseam × 1.08 (reduces knee strain for relaxed riding)
• Moderate: Inseam × 1.09 (classic Hamley formula)
• Aggressive: Inseam × 1.10 (maximizes power output for performance riding)
This ensures optimal knee flexion angle (25-35°) at bottom dead center.
Saddle Width Selection:
If sit bone width provided: Sit Bone Width + 15-30mm (depending on riding posture)
• Upright (>90°): +25-30mm (more weight on sit bones)
• Moderate (60-90°): +20-25mm (balanced pressure)
• Aggressive (<60°): +15-20mm (forward weight shift)
If not provided: Based on gender averages - Males: 100-120mm sit bones (130-155mm saddle), Females: 110-130mm sit bones (145-170mm saddle)
Handlebar Reach Guidelines:
Estimated from arm span (height × 1.03):
• City: ~30% of arm span (short reach, upright comfort)
• Mountain: 35-38% of arm span (balanced control)
• Road: ~40% of arm span (aerodynamic efficiency)
Adjust stem length ±10-20mm to fine-tune.
Grip Diameter Guidelines:
Correlates with hand size, which scales with height. Small hands (<165cm height): 27-30mm, Medium (165-185cm): 30-32mm, Large (>185cm): 33-35mm diameter.
ℹ️ Important Note: These calculations provide excellent starting points used by professional bike fitters worldwide. However, individual body proportions (torso-to-leg ratio, arm length, flexibility) may require ±2cm adjustments. We recommend test riding when possible and making micro-adjustments based on comfort during your first few rides.
❓ Frequently Asked Questions About E-Bike Sizing
Q: Why is inseam more important than height for bike sizing?
A: Inseam (leg length) directly determines your standover height and optimal saddle position, which are critical for comfort and power transfer. Two people with the same height can have significantly different inseam measurements due to torso length variations, requiring different frame sizes.
Q: Do e-bikes require different sizing than regular bikes?
A: E-bikes typically follow the same sizing principles, but the added weight (battery and motor) makes proper fit even more important for handling and control. Some e-bike manufacturers recommend sizing down for better maneuverability in city riding.
Q: What if I'm between two frame sizes?
A: If between sizes, choose the smaller frame for more agile handling and better standover clearance (important for e-bikes). Choose the larger frame if you have a long torso or prefer a more stretched-out, aerodynamic position. Our calculator will alert you if you're on a size boundary and provide specific recommendations.
Q: How often should I adjust my saddle height?
A: Initially, you may need to make small adjustments (3-5mm) every few rides until you find your perfect position. Once set correctly using the Hamley method, saddle height rarely needs changing unless your flexibility improves significantly.
Q: What is "Handlebar Reach" and why does it matter?
A: Handlebar reach is the horizontal distance from your saddle to the handlebars. It affects your riding posture, aerodynamics, and comfort. Too long causes back strain; too short feels cramped. Our calculator estimates your ideal reach based on arm span and riding style.
Q: Can I use these measurements for any e-bike brand?
A: These calculations provide universal guidelines, but always check the manufacturer's specific geometry charts. Brands may have slight variations in how they define frame sizes. Use our results as a strong starting point.
- Choosing a selection results in a full page refresh.