How far is Grantham, NH from Merrimack, NH?
The driving distance from Grantham, NH to Merrimack, NH is about 67.4 miles (108.4 km), with a travel time of about 01h 09m by car.
- The straight-line flight distance is about 54 miles (86.9 km).
- For a round trip, plan for roughly 02h 18m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM EDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 01h 09m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
Town in Merrimack County, New Hampshire
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny
Mostly Cloudy
Driving Route Map
The map below follows the saved road route between Grantham and Merrimack.
Turn-by-Turn Driving Directions
Step-by-step road directions between Grantham and Merrimack.
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1
Start on the route
38 m · 14 sec
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2
Turn left
3224 ft · 55 sec
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3
Take the ramp slight right
2017 ft · 49 sec
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4
Merge slight left
42.5 mi · 49 min
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5
Take the exit slight right toward I 93 South Toll: Manchester, Boston
1 km · 1 min
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6
Merge slight right onto Everett Turnpike
5.7 mi · 7 min · Everett Turnpike
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7
Keep slight left to continue on Everett Turnpike
2 mi · 2 min · Everett Turnpike
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8
Keep slight left to continue on Everett Turnpike
8.2 mi · 11 min · Everett Turnpike
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9
Keep slight left to continue on Everett Turnpike
2.4 mi · 3 min · Everett Turnpike
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10
Take the exit slight right toward Airport
1.3 km · 1 min
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11
Keep slight right to continue on Merrimack
1425 ft · 38 sec
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12
Turn right onto South River Road
704 ft · 13 sec · South River Road
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13
Continue on Daniel Webster Highway
3.8 mi · 8 min · Daniel Webster Highway
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14
Turn slight left onto Loop Road
25 m · 4 sec · Loop Road
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15
Arrive at your destination
0 m · 1 sec · Loop Road
Car Route Details
A richer read on the saved driving route between Grantham and Merrimack.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Longest stretch
Merge slight left
42.5 mi · 00h 49m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Partly Sunny leaving Grantham and Mostly Cloudy near Merrimack.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Grantham to Merrimack?
The road trip is about 67.4 miles (108.4 km) and usually takes 01h 09m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Hopkinton is a useful midpoint, sitting about 33.7 miles from Grantham and 33.7 miles from Merrimack.
How much longer is the road route than the straight-line distance?
The direct path is about 54 miles (86.9 km), while the road route adds roughly 13.4 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 8:00 AM to 10:00 AM EDT. If you want a more comfortable same-day return, try to leave by 4:12 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $9.39 one way or $18.78 round trip. Estimated CO2 is about 21.2 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny around Grantham and Mostly Cloudy near Merrimack.
Stop Ideas Near Hopkinton
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 Hopkinton.
Concord, New Hampshire
Manchester, New Hampshire
Tilton, New Hampshire
Nashua, NH
Flight Path Map
This map shows the direct air route between Grantham and Merrimack. Straight-line distance: 53.99 mi (86.89 km).
#1 Grantham
Town in Sullivan County, New Hampshire, United States
| Population | 2,955 |
| Coordinates | 43.4895200, -72.1375900 |
| Altitude | 288 |
| Country | United States |
#2 Merrimack
River in New Hampshire and Massachusetts, United States
| Population | 27,452 |
| Coordinates | 42.8650900, -71.4934000 |
| Altitude | 47 |
| Country | United States |
End: (-71.493333, 42.865106)
Estimated Travel Time
Distance: 108 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 14m |
| 40 mph (64.37 km/h) | 01h 41m |
| 50 mph (80.47 km/h) | 01h 20m |
| 60 mph (96.56 km/h) | 01h 07m |
| 70 mph (112.65 km/h) | 00h 57m |
| 80 mph (129 km/h) | 00h 50m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.95 | $9.39 | $18.78 |
| Mid-grade | $4.46 | $10.61 | $21.22 |
| Premium | $4.86 | $11.56 | $23.12 |
| Diesel | $6.00 | $14.27 | $28.55 |
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 New Hampshire · Apr 29, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.