How far is Mercer, WI from City of Janesville, WI?
The driving distance from Mercer, WI to City of Janesville, WI is about 273.7 miles (440.5 km), with a travel time of about 04h 23m by car.
- The straight-line flight distance is about 245.9 miles (395.8 km).
- For a round trip, plan for roughly 08h 46m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM CDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 04h 23m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Village in Portage County, Wisconsin, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Mercer and City of Janesville.
Turn-by-Turn Driving Directions
Step-by-step road directions between Mercer and City of Janesville.
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1
Start on US 51
32.8 mi · 49 min · US 51
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2
Continue on Oneida Street
71.1 mi · 1 hr 29 min · Oneida Street
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3
Keep slight left to continue on I 39 South, US 51 South: Stevens Point, Madison
22.5 mi · 24 min
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4
Continue straight
7.4 mi · 8 min
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5
Continue straight
73.1 mi · 1 hr 18 min
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6
Keep slight right
29.6 mi · 32 min
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7
Keep slight right to continue on I 39, I 90: Chicago
33.1 mi · 35 min
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8
Take the exit slight right
1240 ft · 30 sec
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9
Keep slight right to continue on WI 26: State Highway 26
1117 ft · 32 sec
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10
Keep slight right to continue on WI 26 South: Janesville
126 m · 10 sec
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11
Turn slight right onto Milton Avenue
2.3 mi · 5 min · Milton Avenue
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12
Turn left onto East Memorial Drive
80 m · 12 sec · East Memorial Drive
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13
Continue on North Garfield Avenue
2552 ft · 2 min · North Garfield Avenue
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14
Turn right onto East Court Street
142 m · 16 sec · East Court Street
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15
Arrive at your destination
0 m · 1 sec · East Court Street
Car Route Details
A richer read on the saved driving route between Mercer and City of Janesville.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 39 South
Continue straight
73.1 mi · 01h 18m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Partly Sunny leaving Mercer and Chance Rain Showers near City of Janesville.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Mercer to City of Janesville?
The road trip is about 273.7 miles (440.5 km) and usually takes 04h 23m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Whiting is a useful midpoint, sitting about 136.6 miles from Mercer and 137.2 miles from City of Janesville.
How much longer is the road route than the straight-line distance?
The direct path is about 245.9 miles (395.8 km), while the road route adds roughly 27.8 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 8:14 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $36.43 one way or $72.86 round trip. Estimated CO2 is about 85.8 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny around Mercer and Chance Rain Showers near City of Janesville.
Stop Ideas Near Whiting
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Whiting.
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Flight Path Map
This map shows the direct air route between Mercer and City of Janesville. Straight-line distance: 245.93 mi (395.79 km).
#1 Mercer
Civil town in Iron County, Wisconsin
| Population | 1,387 |
| Coordinates | 46.1655000, -90.0626600 |
| Altitude | 488 |
| Country | United States |
#2 City of Janesville
The most populous city in Rock County, Wisconsin.
| Population | 64,128 |
| Coordinates | 42.6857000, -89.0138500 |
| Altitude | 261 |
| Country | United States |
End: East Court Street (-89.013903, 42.685777)
Estimated Travel Time
Distance: 441 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 09h 07m |
| 40 mph (64.37 km/h) | 06h 50m |
| 50 mph (80.47 km/h) | 05h 28m |
| 60 mph (96.56 km/h) | 04h 33m |
| 70 mph (112.65 km/h) | 03h 54m |
| 80 mph (129 km/h) | 03h 24m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $36.43 | $72.86 |
| Mid-grade | $4.25 | $41.08 | $82.17 |
| Premium | $4.65 | $44.96 | $89.92 |
| Diesel | $5.30 | $51.24 | $102.47 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Wisconsin · May 05, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.