Zwift Segment Time Calculator

Enter your FTP (watts), weight (kg), and height (cm), then choose a Zwift segment to get a physics-based estimated finish time. You'll also see your W/kg, average speed, and average power for that segment — perfect for pacing Alpe du Zwift, Epic KOM, sprints, and more.

Disclaimer: This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any health-related decisions.

W

Your Functional Threshold Power in watts. Used to estimate sustainable segment power.

kg
cm
%

What percentage of your FTP you plan to sustain. 95% is typical for a hard effort.

Results

Estimated Segment Time

--

W/kg at Effort

--

Target Power

--

Average Speed

--

Time (h:mm:ss)

--

Results Table

More Health & Fitness Tools

Frequently Asked Questions

How accurate are the segment time estimates?

The estimates use a physics-based model accounting for gradient resistance, rolling resistance, and aerodynamic drag scaled to the segment's average gradient. They are typically within 5–10% of real Zwift times for most riders. Factors like in-game drafting, power-ups, and pacing variability can cause differences from actual results.

What W/kg do I need to go sub-60 minutes on Alpe du Zwift?

Most riders need approximately 3.2–3.5 W/kg sustained to complete Alpe du Zwift in under 60 minutes. This equates to roughly 240–260 W for a 75 kg rider. Your exact threshold depends on pacing efficiency and in-game conditions.

What power percentage of FTP should I target for a segment PR?

For short segments under 5 minutes, you may sustain 110–120% of FTP. For medium climbs (10–30 min) like Epic KOM, 95–100% of FTP is typical. For long efforts like Alpe du Zwift (over 45 min), targeting 90–95% of FTP is more realistic and sustainable.

What segments are included in this calculator?

This calculator covers the most popular Zwift KOM climbs, sprint segments, and iconic routes including Alpe du Zwift, Ventoux KOM, Epic KOM, Innsbruck KOM, Col d'Aspin, Col de la Madeleine, and several sprint segments across Watopia, London, and New York.

Does Zwift physics actually use my height and weight?

Yes — in Zwift, your weight directly affects climbing speed (heavier riders are slower on climbs) and your height influences your CdA (aerodynamic drag), which matters more on flat segments and descents. Accurate inputs give you more realistic predictions.

How does drafting affect segment times in Zwift?

Drafting in Zwift can reduce the power needed to hold a given speed by 15–25% on flat and rolling segments. This calculator assumes solo (non-drafted) efforts. If you plan to ride in a group or pace line, your actual time will likely be faster than the estimate.

Why is my estimated time different from my previous Zwift result?

Real-world Zwift times depend on your actual sustained power output during the segment, not just your FTP. Factors like warm-up state, fatigue, pacing strategy, power-ups used, and game lag can all affect results. Use this tool as a pacing guide rather than a guaranteed prediction.

Can I use this calculator for training pacing?

Absolutely. By adjusting the effort level percentage, you can estimate times at different training intensities — useful for planning structured efforts, setting realistic goals, or comparing how fitness improvements (FTP gains or weight loss) would affect your segment times.