⚡ High Performance Pacing Engine

Bike Pace & Cycling Speed Calculator: Watts, Time & Physics Solver

Calculate average speed, pace (min/mi & min/km), finish time, and aerodynamic power demands. Toggle between instant speed/time pacing, physics-based wattage estimates, or ingest GPX/FIT course files for segment splits.

⚡ Quick-Load Pacing Presets:

⚙️ Pace & Ride Parameters

mi
h
m
s
lbs

📊 Calculated Speed & Pace Metrics

Average Speed 20.0 mph 32.2 km/h
Cycling Pace 3:00 min/mi 1:52 min/km
Total Moving Time 1h 15m 00s 25.0 miles covered
Estimated Energy Burn ~740 kcal Mechanical & metabolic work
⚡ Hourly Carbohydrate & Hydration Target

For a 1h 15m ride at this pace, target 60g carbohydrates per hour to prevent glycogen depletion.

⚙️ Rider & Environment Inputs

Watts
lbs
lbs
Watts
%
mi
mph
ft

📊 Calculated Telemetry

Estimated Speed -- mph
Estimated Time --:--
Power-to-Weight -- W/kg
Air Density (ρ) -- kg/m³

⚡ Environmental Resistance Breakdown

Aero Drag: --W
Gravity: --W
Rolling: --W
Drivetrain: --W

🗺️ Course File Ingestion (.GPX or .FIT)

📁
Drag & Drop Course File (.gpx, .fit, .tcx)

Export courses from Garmin Connect, Strava, RideWithGPS, or Komoot.

Watts
lbs

⏱️ Predicted Event Performance

📈
No Course Loaded Yet

Upload your GPX or FIT route to parse climbs, segment power targets, and total finish time.

📊 Official Cycling Pacing Benchmarks

Bike Pace & Speed Reference Chart (12 to 28 MPH)

Use this quick reference table to find your target pace per mile, pace per kilometer, and estimated finish times for popular cycling distances:

👉 Swipe horizontally to view full pace & finish time matrix →

Speed (MPH & KM/H) Pace (Min / Mi) Pace (Min / KM) 10 Miles 25 Miles 50 Miles 100 KM (62.1 mi) Century (100 mi)
12.0 mph (19.3 km/h) 5:00 min/mi 3:06 min/km 50m 00s 2h 05m 4h 10m 5h 11m 8h 20m
14.0 mph (22.5 km/h) 4:17 min/mi 2:40 min/km 42m 51s 1h 47m 3h 34m 4h 26m 7h 09m
16.0 mph (25.7 km/h) 3:45 min/mi 2:20 min/km 37m 30s 1h 34m 3h 07m 3h 53m 6h 15m
18.0 mph (29.0 km/h) 3:20 min/mi 2:04 min/km 33m 20s 1h 23m 2h 47m 3h 27m 5h 33m
20.0 mph (32.2 km/h) 3:00 min/mi 1:52 min/km 30m 00s 1h 15m 2h 30m 3h 06m 5h 00m
22.0 mph (35.4 km/h) 2:44 min/mi 1:42 min/km 27m 16s 1h 08m 2h 16m 2h 49m 4h 33m
24.0 mph (38.6 km/h) 2:30 min/mi 1:33 min/km 25m 00s 1h 02m 2h 05m 2h 35m 4h 10m
26.0 mph (41.8 km/h) 2:18 min/mi 1:26 min/km 23m 05s 57m 42s 1h 55m 2h 23m 3h 51m
⚡ US Authorized Retailer

Turn Target Numbers Into Real-World Speed

Pacing requires real-time data on your handlebars and high-carb fuel in your bottles. We stock official power meters, GPS computers, and elite nutrition with authentic U.S. warranties and fast domestic shipping.

Favero Assioma

Assioma Uno Single-Sided Pedals

Accurate left-leg power measurement with Look Keo cleats. Official 2-year factory warranty.

Garmin

Edge 840 GPS Cycling Computer

Touchscreen + buttons, ClimbPro real-time ascent tracking, multi-band GNSS accuracy, and targeted pacing.

Carbs Fuel

Original 50g Energy Gels (18-Pack)

50g carbs per pouch with optimal 1:0.8 maltodextrin to fructose ratio. Fast-acting glycogen fueling.

ChainLink Analytics

Free Endurance Cycling Platform

Sync workouts directly to Garmin, Wahoo, & Zwift. Auto-calculate PMC fitness (CTL), fatigue, and form.

📖 Cycling Speed Calculator & Pacing Science (In Plain English)

Understand the physics behind speed, aerodynamics, and race-day endurance:

💨 The 4 Forces That Determine Your Cycling Speed +

Every watt you produce at the pedals fights four distinct physical resistances:

  • Aerodynamic Drag (P_aero): Accounts for 70% to 90% of total resistance on flat roads above 18 mph. Air resistance scales with the cube of your speed, meaning doubling your speed requires 8x the aerodynamic power.
  • Gravity Resistance (P_grav): Becomes the dominant force on gradients steeper than 3%. On a 6% climb, over 70% of your power is spent lifting your body and bike against gravity.
  • Rolling Resistance (P_roll): Friction between your tire casing and the pavement. Supple tubeless tires with low rolling resistance save 10–20 watts over stiff butyl tube setups.
  • Drivetrain Losses (P_dt): Mechanical friction in your chain, cassette, and pulley wheels (typically 2% to 4% on clean, waxed drivetrains).
🚴 Aerodynamic Drag (CdA): Free Speed Without Extra Watts +

CdA (Coefficient of Aerodynamic Drag × Frontal Area) measures how much air your body pushes. Riding in the drops or on aero bars reduces your CdA from 0.320 to 0.240 m², giving you 2 to 3 mph of free speed at the exact same 200W pedaling effort.

🏔️ How to Pace a Century, Gran Fondo, or Gravel Race +

The #1 mistake endurance cyclists make is surging over early climbs. Riding at 115% of your FTP for 3 minutes early in a 100-mile ride burns glycogen at 4x the rate of steady endurance pacing, guaranteeing a severe bonk at mile 75.

  1. Target 70%–75% of your FTP as your average power ceiling for events over 4 hours.
  2. Cap climb wattages at 90%–95% FTP, shifting to easier gears and spinning at 85–95 RPM.
  3. Fuel aggressively from minute 20: Ingest 60–90 grams of carbs and 500–750ml fluid every single hour.
⚡ Watts to Speed Calculator: How Fast is 200 Watts on a Bike? +

A frequent question cyclists ask is: "How fast will 200 watts take me?" The answer depends entirely on your aerodynamic profile (CdA), rider + bike weight, and gradient:

  • Flat Road (0% Grade, Hoods Position, 75kg rider + 8kg bike): 200 watts yields approximately 19.8 to 20.4 mph (31.8 to 32.8 km/h) in calm wind conditions.
  • Flat Road (Aero Drops / TT Bars): Dropping your frontal area (CdA from 0.320 to 0.240 m²) increases your speed to 21.6 to 22.4 mph (34.8 to 36.0 km/h) at the exact same 200 watts.
  • Moderate Climb (5% Grade): Gravitational resistance dominates. 200 watts slows you to approximately 8.6 mph (13.8 km/h).
  • Steep Climb (8% Grade): 200 watts yields approximately 5.6 mph (9.0 km/h).

Use the interactive sliders above to adjust rider weight, position, tire Crr, and wind speed to see your precise speed and finishing time breakdown.

Frequently Asked Questions

How does this cycling speed calculator determine speed from watts?

This cycling speed calculator solves the complete physical equations of motion for cycling. It balances total mechanical power at the pedals against four resistive forces: Aerodynamic drag (governed by air density, frontal area CdA, and apparent wind speed cubed), Gravity resistance (gradient steepness and total rider + bike mass), Rolling resistance (tire casing Crr and road surface), and Mechanical drivetrain friction (typically 2–4% loss).

How fast is 200 watts on a road bike?

On a flat road (0% gradient) in calm wind with an average 75 kg rider on an 8 kg road bike, 200 watts produces approximately 19.8 to 20.4 mph (31.8 to 32.8 km/h) riding on the brake hoods. Riding in the drops or an aero tuck increases speed to 21.6 to 22.4 mph at the identical 200-watt effort. On a 5% hill, 200 watts slows to 8.6 mph.

What is aerodynamic drag (CdA) in cycling speed calculation?

CdA (Coefficient of Aerodynamic Drag × Frontal Area, in m²) measures how much air your body and bike displace. Because aerodynamic drag accounts for 70% to 90% of total resistance above 18 mph, reducing CdA from 0.320 m² (upright hoods) to 0.240 m² (aero drops) gives you 2 to 3 mph of free speed without producing a single extra watt.

How do hill gradients affect cycling speed and required watts?

Once road gradient exceeds 3% to 4%, gravity replaces aerodynamic drag as the primary opposing force. On an 8% climb, over 80% of your power is spent lifting your total system mass uphill. Every additional kilogram of weight requires roughly 2.5 to 3 extra watts to maintain the same climbing speed.

How do I calculate bike pace (min/mile) and finish time for a 100-mile century ride?

Enter your target average wattage or speed into the calculator alongside course elevation gain. For example, averaging 18 mph translates to a pace of 3 minutes and 20 seconds per mile (3:20 min/mi), yielding a rolling finish time of 5 hours and 33 minutes for a 100-mile ride. We recommend capping your century power at 70%–75% of your FTP.

Can I drag and drop GPX or FIT route files to get segment pacing?

Yes! Use the Course File Ingestion panel to drag and drop any .GPX or .FIT track. The calculator automatically parses real-world distance, cumulative elevation gain, and segment gradients, calculating precise pacing splits and estimated completion times based on your target average wattage.

What is the difference between this and a basic bike speed calculator?

Basic online calculators use simplistic flat-ground speed ratios. The Threshold Cycling calculator solves the full Newtonian power-balance equations including wind yaw angles, barometric air density, tire rolling resistance (Crr), drivetrain mechanical losses, and multi-segment GPX course simulations.