Validated on 1,000+ real rides
Trusted by riders in 30+ countries • 100% private • No signup needed
Stop Guessing Your E-Bike Range. Know It. Exactly.
Trusted by 3,000+ riders to predict range with ±2–5% accuracy using real wind, elevation, drag & battery physics.
⚡ Instant — processed locally in your browser
Your GPX file is processed locally.
Range Anxiety Destroys Great Rides
Every year, thousands of riders get stranded or miss amazing routes because they trusted a simple “km per Wh” guess that ignored wind, elevation, and real physics.
Dead Battery, Miles from Home
You planned for 60 km. But the brutal headwind, that unexpected climb, and your loaded panniers drained 40% more battery than expected. Now you're pushing a 25kg dead weight uphill, sweating and stranded.
This happens to riders every single day.
Adventure Lost to Fear
That breathtaking coastal route? You skipped it because you “weren't sure” if you'd make it. Later, you discover you had 20 km to spare—an opportunity lost forever.
Fear of the unknown costs you the best rides.
Constant Stress Replaces Joy
Every hill, every gust of wind—you're doing exhausting mental gymnastics. “Can I make it? Should I turn back?” Your ride becomes a stressful calculation instead of the freedom you bought the e-bike for.
Range anxiety turns joy into anxiety.
Join 3,000+ riders who plan with confidence
Battery Physics
Real battery discharge modeling using motor efficiency curves.
Wind & Drag
Segment-based aerodynamic resistance modeling using real vectors.
Elevation & Slope
Precise gravitational force calculations on every climb.
Stop Guessing. Start Knowing.
See the difference between rough estimates and physics-based precision
Other Calculators
Simple formulas, dangerous guesswork
Fixed consumption rate
Assumes flat 15 Wh/km regardless of terrain
Ignores wind completely
20 km/h headwind? Not in the calculation
No aerodynamic drag
Pretends you're in a vacuum
Basic elevation handling
Total elevation gain only—no segment-by-segment physics
±15–40% error
Get stranded or miss routes
This Calculator
Physics-based precision you can trust
Motor efficiency curves
Real-world power draw at every speed & torque level
Wind speed & direction
Adjusts drag for headwinds, tailwinds, crosswinds
Aerodynamic resistance
CdA, frontal area, rider position all modeled
Segment-by-segment physics
Gravitational forces, recuperation, slope angles calculated per 100m
±2–5% accuracy
Real rides prove it works
See How Wind and Hills Destroy Your Range
Watch in real-time how each variable eats your battery—and why simple calculators get it so wrong
Estimated Range
Simplified demo. Real calculations model every 100m segment with precise physics.
Your actual calculation will be far more accurate.
Three Steps to Range Certainty
From route upload to physics-based predictions in under 10 seconds
Upload Your Route
Drop your GPX file. We instantly extract elevation, distance, slope, and GPS data—all processed locally in your browser.
We Run Real Physics
Thousands of calculations per 100m segment: wind vectors, aerodynamic drag, gravitational forces, motor efficiency curves.
Know Your Real Range
Precise range predictions, detailed energy breakdown, charging stop recommendations—delivered in seconds.
Free to use • No credit card • Instant results
From Range Anxiety to Complete Confidence
Real riders share how physics-based predictions changed their adventures
“Finally! A calculator that accounts for the 15 kg of camping gear I carry. Predicted 68 km, actual was 66 km. Incredible accuracy.”
Maria K.
Germany · Touring Cyclist
“I planned a 120 km mountain route with 2,000m elevation. It said I'd need one charging stop. Dead on. No more range anxiety!”
James L.
USA · Mountain Biker
“As a daily commuter, knowing my exact range in different wind conditions is a game-changer. Worth every second.”
Sophie R.
Netherlands · Commuter
Works with e-bikes from all major brands
Why Other Range Calculators Fail You
It's not your fault if you've been disappointed. Most calculators use shortcuts that guarantee inaccuracy.
They use fixed Wh/km consumption
Assuming 15 Wh/km works on flat ground at 20 km/h. But on a 10% climb at 15 km/h with a headwind? You'll use 40+ Wh/km. They can't model this.
They ignore wind & drag entirely
A 20 km/h headwind can reduce range by 20–30%. Most calculators don't even ask about wind. We calculate aerodynamic resistance for every segment.
No real motor efficiency curves
Motor efficiency varies from 60% to 85% depending on speed and load. They use average values. We model the full curve.
They skip recuperation & pedaling power
On descents, you can recover energy. When you pedal hard, motor assistance drops. We factor both in.
We Model Real Physics
Every variable modeled. Every 100m segment calculated. Wind vectors, aerodynamic drag, slope forces, motor efficiency, weight, rolling resistance—nothing left to chance.
±2–5% accuracy validated on 1,000+ real rides
Used by riders in 30+ countries
Built After Getting Stranded Twice in the Alps
I got stranded twice on mountain passes—pushing a dead 28kg bike uphill, miles from the nearest outlet.
Every calculator said I'd make it. None accounted for the headwind, the 12% grade, or my loaded panniers.
So I built the tool I desperately needed—one that uses real physics, not hopeful guesses.
— Developer & Long-Distance Touring Cyclist
Your Routes Stay Yours. Always.
Every calculation happens in your browser. No uploads, no servers, no tracking—just you and the physics.
Zero Server Uploads
Your GPX file is parsed and analyzed entirely in your browser. Nothing uploaded, ever.
Your routes are sacred—we never see them.
Zero Tracking, Zero Ads
No personal data collection. No location tracking. No behavioral profiling. Ever.
We respect riders, not just their data.
Instant Results, Zero Friction
Upload your GPX and get results in seconds. No email signup, no password, no account needed.
Just the tool, none of the hassle.