Time & Cost Savings to Calculate Distance Between Two Addresses Using Google Maps in Excel

This tool estimates the time and cost savings achieved by automating bulk address distance calculations in Excel via the Google Maps API, compared to performing the task manually.

Automation Savings Calculator

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In-Depth Guide to Calculating Distances in Excel

What is Calculating Distance Between Two Addresses in Excel?

Calculating the distance between two addresses in Excel refers to the process of using spreadsheet functions to determine the real-world travel distance (not a straight line) between multiple sets of geographic locations. This is not a built-in feature of Excel. Instead, it requires a custom solution that connects to a mapping service like the Google Maps API. This technique is invaluable for logistics planners, sales route optimizers, researchers, and anyone needing to process geographic data in bulk. The primary method involves writing a custom VBA (Visual Basic for Applications) script that sends address data from your spreadsheet to Google’s servers and then writes the returned distance data back into your cells.

The Method: Using a VBA Function and the Google Maps API

Excel does not have a native =GET_DISTANCE() function. To achieve this, you must create a User-Defined Function (UDF) using VBA. This function acts as a bridge between your worksheet and the Google Maps Distance Matrix API. The API takes origin and destination addresses as input and returns detailed information, including travel distance and duration.

Here is a complete, functional VBA script you can add to your Excel workbook. You must first get a free API key from the Google Cloud Platform and enable the “Distance Matrix API” service for it to work.

'Add this code to a new Module in the VBA Editor (ALT + F11)
'Requires a reference to 'Microsoft XML, v6.0'. Go to Tools -> References and check the box.

Public Function GoogleMapsDistance(origin As String, destination As String, apiKey As String, unit As String) As Double
    Dim url As String
    Dim httpReq As Object
    Dim jsonResponse As String
    Dim distanceValue As Double

    On Error GoTo ErrorHandler

    'Encode addresses for URL
    Dim encodedOrigin As String
    Dim encodedDest As String
    encodedOrigin = WorksheetFunction.EncodeURL(origin)
    encodedDest = WorksheetFunction.EncodeURL(destination)

    'Construct the API URL
    url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=" & encodedOrigin & _
          "&destinations=" & encodedDest & "&key=" & apiKey

    'Create HTTP request object
    Set httpReq = CreateObject("MSXML2.XMLHTTP.6.0")
    httpReq.Open "GET", url, False
    httpReq.send

    'Get the response
    jsonResponse = httpReq.responseText

    'Basic parsing to find the distance value in meters
    Dim valueMarker As String
    valueMarker = """distance"" : {\s*""text"" : "".*?"",\s*""value"" : "
    
    Dim regex As Object
    Set regex = CreateObject("VBScript.RegExp")
    regex.Pattern = """value""\s*:\s*([0-9]+)"
    regex.Global = False
    
    If regex.Test(jsonResponse) Then
        Dim matches As Object
        Set matches = regex.Execute(jsonResponse)
        distanceValue = CDbl(matches(0).SubMatches(0)) 'Distance in meters
    Else
        GoogleMapsDistance = -1 'Error code for "not found"
        Exit Function
    End If

    'Convert meters to the desired unit
    If LCase(unit) = "km" Then
        GoogleMapsDistance = distanceValue / 1000
    ElseIf LCase(unit) = "miles" Then
        GoogleMapsDistance = distanceValue / 1609.34
    Else
        GoogleMapsDistance = distanceValue 'Default to meters
    End If

    Exit Function

ErrorHandler:
    GoogleMapsDistance = -2 'General error code
End Function

                

Formula Variables Explained

Variables used in the custom Excel VBA function to calculate distance.

Variable	Meaning	Unit (in Formula)	Example Value
origin	The starting address or coordinates.	Text String	“1600 Amphitheatre Parkway, Mountain View, CA”
destination	The ending address or coordinates.	Text String	“1 Infinite Loop, Cupertino, CA”
apiKey	Your personal Google Cloud Platform API key.	Text String	“AIzaSy… (your key here)”
unit	The desired output unit for the distance.	Text String (“km” or “miles”)	“km”

Practical Examples

Example 1: Single Distance Calculation

Imagine you have your starting address in cell A2, your destination in B2, and your API key in C2. In cell D2, you would enter the following formula:

=GoogleMapsDistance(A2, B2, C2, "miles")

Excel will then run the VBA script, call the Google Maps API, and display the driving distance in miles in cell D2.

Example 2: Bulk Calculation for a List of Addresses

The real power comes from applying this to a list. If you have origins in column A (from A2 to A100) and destinations in column B (from B2 to B100), you can use the formula efficiently. To avoid re-typing the API key, place it in a single cell (e.g., F1) and reference it absolutely.

In cell D2, type: =GoogleMapsDistance(A2, B2, $F$1, "km")

You can then drag this formula down from D2 to D100. Excel will automatically calculate the distance for each row, saving you hours of manual work. A related topic you might find useful is our guide on geocoding.

How to Use This Automation Savings Calculator

This page’s calculator helps you quantify the benefits of the automation described above.

1. Enter the Number of Address Pairs: Input how many distance calculations you need to perform.
2. Estimate Manual Lookup Time: Enter a realistic average of how many minutes it would take you to find and record the distance for one pair of addresses by hand.
3. Confirm API Cost: The calculator defaults to $5.00 per 1,000 calls, a common price for the Distance Matrix API. You can adjust this if you have a different pricing plan.
4. Calculate: The tool will show you the total hours you would spend on manual entry versus the estimated cost of using the API, highlighting the immense time savings.

Key Factors That Affect Distance Calculation

• API Key Validity: An incorrect or disabled API key is the most common reason for errors. Ensure it’s active and has the Distance Matrix API enabled.
• Address Formatting: The API is robust, but poorly formatted or ambiguous addresses can lead to incorrect results. Use full, clean addresses where possible.
• API Usage Quotas: Google enforces limits on how many requests you can make per day and per minute. For very large datasets, you may need to spread your calculations out over time.
• Travel Mode: The API defaults to ‘driving’ but can be modified to calculate distances for ‘walking’, ‘bicycling’, or ‘transit’. Our function uses the default.
• Unit Conversion: The API returns distances in meters. The VBA function must correctly convert these to your desired units (km or miles).
• Internet Connection: Since the VBA script makes an external web request, a stable internet connection is required for it to work.

Frequently Asked Questions (FAQ)

How do I get a Google Maps API key?

You need to create a project in the Google Cloud Platform console, enable the “Distance Matrix API”, and generate credentials to get an API key. You will also need to enable billing on your account.

Is the Google Maps API free?

The API operates on a pay-as-you-go model. Google provides a recurring monthly free credit, which covers a significant number of requests. For low-volume use, it can often be free. High-volume users will incur costs.

Why does my formula return an error like #NAME? or -2?

A #NAME? error means Excel doesn’t recognize the function. Make sure you’ve installed the VBA code correctly in a module. A -2 or -1 error from our function typically indicates a problem with the API request, often due to an invalid API key, incorrect addresses, or no internet connection.

Can I calculate driving time instead of distance?

Yes. The Google Maps Distance Matrix API returns both distance and duration. The provided VBA script can be easily modified to parse the “duration” value instead of the “distance” value from the API’s JSON response.

What are the limitations of the API?

The primary limitations are the number of origins and destinations you can send in a single request (typically 25 of each) and the rate limits on how many elements (origins x destinations) you can request per minute.

Do I have to enable macros in Excel?

Yes. Since this solution uses a VBA script, you must enable macros in your Excel workbook or trust the document for the function to run.

Is this better than buying an Excel add-in?

This DIY method is free to set up and highly customizable. Paid add-ins might offer a more user-friendly interface but perform the same underlying function of calling a mapping API. For more on this, see our comparison of data analysis tools.

How accurate is the distance?

The distance is highly accurate as it’s based on Google’s comprehensive mapping data and routing algorithms, reflecting actual driving routes.

Related Tools and Internal Resources

• Bulk Geocoder Tool – Convert addresses to latitude and longitude coordinates.
• Route Optimization Analysis – Learn about strategies for planning efficient multi-stop routes.
• Understanding API Costs – A deep dive into managing and predicting API-related expenses.
• VBA for Beginners – Get started with programming in Excel.