Skip to content

How to Measure for a Door Lock

This article is a collaborative effort, crafted and edited by a team of dedicated professionals.

Contributors: Muhammad Baballe Ahmad, Mehmet Cavas, Sudhir Chitnis, and Zhen-ya Liu.

✓ Verified & Tested Information

How to Measure for a Door Lock – Learn how to measure correctly for a door lock replacement. This guide provides step-by-step instructions on how to measure a door lock, what to look for, and what to avoid.

Preparation

Before measuring for a door lock, it’s important to first prepare. Make sure you have all the necessary tools, such as a measuring tape, a pencil or marker, and a screwdriver. Also, measure the door width and the door’s doorstop. The doorstop is the part of the door that is against the wall when the door is closed. Knowing the measurements of the door and doorstop are necessary for correctly measuring for the door lock.

Gather the necessary tools

In order to measure accurately for a door lock, it is important to have a few simple tools on hand. You will need:

Tape measure or ruler
Pencil
Phillips head screwdriver
Flathead screwdriver
Flashlight (optional)
Drill (optional)
Level (optional)
Once you have gathered the necessary tools, make sure that the door has been closed and locked. Open the door and inspect the existing lockset. Check the type of screws used around the exterior side of the lockset – they may be either Phillips or flathead – and make note of these before you proceed. If you are using a drill, open any holes necessary in order to access the knob/deadbolt screws. It is usually necessary to remove some metal or wood types of material in order for proper installation. Determine how deep any such material needs to be removed before proceeding with your project. Insert a flashlight into any openings so as to verify that you have removed any obstructions completely.

Measure the door

Measuring the door is a necessary step to ensure that you get the right type of lock for your setup. It is important to accurately measure both the thickness and height of your door as this will determine the size and type of lock you need. Starting with the thickness, measure from one edge of your door to the other, as close to where your lock will be placed as possible. Make sure to accurately record this measurement in either inches (in.) or millimeters (mm). For height, measure from top to bottom, ensuring that you take accurate measurements both at the top and bottom of your door so you can get an accurate outlined area. Once these measurements are taken, use them to select an appropriate-sized lock for installation on your door.

Measure the Backset

The backset is the distance from the edge of the door to the center of the handle. This measurement is essential when selecting a door lock. While there are standard backsets, some door handles may require a different measurement. It is important to accurately determine the backset before purchasing a door lock. Let’s discuss how to measure for the backset of a door lock.

Measure the distance from the edge of the door to the center of the hole

When measuring for a door lock, the first step is to measure the backset, which is the distance from the edge of the door to the center of the hole in the frame into which your mortise lock fits. Be sure that you are measuring each side of any double doors evenly, and backset will typically be 2 inches or 2 inches. Measuring this accurately will ensure that your new doorlock fits correctly within its intended frame.

Measure the diameter of the hole

Before measuring the backset, it is important to identify what type of door lock you need. If you’re replacing an existing lock, take a photo of the existing set before removing it. This will give you a better idea of which type of lockset and backset are appropriate for your door.

Once you have identified the correct lockset and backset combination, the next step is to measure the diameter of the hole. For most cylinder locksets, this is 2-1/8″(5.4 cm). Use a ruler or linestock to measure from one side of the hole to the other, parallel to the edge of the door. If applicable, position your ruler or linestock diagonally in an “X”-shape and measure from corner to corner for space between 3″(7.62 cm) from edge of door to center point in order to determine whether a larger size cylindrical than 2-1/8″ (5.4 cm) is required for a proper fitment for large or medium bore lock cylinders with an adjustable insert.

Measure the Faceplate

When measuring for a door lock, it is important to measure the faceplate of the lock. This is the metal section of the lock that will be installed against the door. It is important to measure correctly in order to ensure that the lock fits correctly and functions properly. Measuring the faceplate is the first step in the process. Let’s look at the process of accurately measuring the faceplate of a door lock.

Measure the width of the faceplate

When measuring for a door lock, the first thing to measure is the width of the faceplate. Faceplates are available in many widths, so choose one that fits your door. The most common faceplate widths are 1-1/2″ and 2″, but other sizes may be available depending on the type of lock you choose. To measure the width of your faceplate, follow these steps:

1. Open the door and place a measuring tape at one end of the faceplate where it meets the edge of the door frame.
2. Stretch the measuring tape across to meet with other side.
3. Make sure to record an exact measurement in either inches or millimeters and note which measurement system you used (inch or mm).
4. Be sure to include any trim or decorative pieces that may hang around or on top of your doorway when taking your measurements; these will affect your final fit and finish if not accounted for properly during installation.

Measure the length of the faceplate

Measuring the length of the door lock faceplate is an important step in the process of installing a door lock. A faceplate will vary in size depending on what type of door lock is being installed, but the most common sizes range from 3 inches (7.6 cm) to 5.5 inches (14 cm). This measurement should be taken from the edge of the door jamb closest to where the hinges are located, and it is important to use a measuring tape that is at least as long as your faceplate measurement. Once you have measured the length of your faceplate, make sure to take note of this so that when you purchase your door lock, you can be certain to get one with a compatible faceplate size.

Measure the Latch

When measuring for a door lock, it is important to get an accurate measurement of the latch to ensure the lock fits properly. Measuring the latch can help you determine the size and type of lock that you need. Here, we will discuss the step-by-step process of measuring the latch of your door lock.

Measure the distance from the edge of the door to the center of the latch

It is imperative that you accurately measure the distance from the edge of the door to the center of the latch hole when purchasing a new door lock. This measurement varies depending on door type and latch type, for instance: wooden doors with aluminum frames typically require a different style lock than metal doors with metal frames. Determine which style of lock is appropriate by examining which kind of latchbolt your door requires.

Single cylinder or vertical deadbolts require a 2 inch measurement from the edge of the door to the center of the latch hole while double cylinder or mortise-style deadbolts require a three inch measurement. You should also take note of any additional security hardware, such as auxiliary deadbolts, require and where it is placed in relation to your existing hardware before purchasing your new lock. Additionally, pay attention to what size, shape and type keyhole pattern your existing lock has been designed with – this will help you select a similar fitting model.

Measure the diameter of the latch

In order to make sure that you select the correct type of door lock, it is important to first measure the diameter of the latch. To do this, start by measuring from the bottom of the latch to the center of the hole in which it fits. This will give you a basic measurement that you can use when selecting your lock.

Next, measure inside and outside of your lock case using an accurate caliper or ruler. You should note down both measurements as this will help you select a lock with a slightly wider design than what is currently installed in your door frame. This will ensure that the replacement unit fits appropriately and helps prevent any future issues due to wear and tear over time.

You can also consider taking measurements based on other factors such as surface characteristics of your door’s frame, overall size and style, as well as handing (right hand versus left hand). All of these measurements are essential in order to accurately select a new door lock that suits your particular needs.

Measure the Strike Plate

Measuring the strike plate for a door lock is an important step in ordering the correct door lock for your door. The strike plate is the metal plate that lines the inside edge of the door frame that the door latch engages with when the door is closed. Knowing the measurements of this strike plate will help ensure you order the right size of door lock for your door.

Measure the width of the strike plate

Before purchasing a new door lock, the first step is measuring the size of the strike plate or the “keeper.” This is the metal plate attached to either side of your door frame. The measurements give you an idea of what size and style of strike plate you will need.

The length and width measurements should be taken from the actual hole in which your current lock is installed. Use a tape measure to measure across the front of the hole and make sure that measurements are taken from one corner to another across each side. In order to ensure that your new strike plate fits correctly, adding approximately 1/8″ to both sides will give you an acceptable margin for error.

Your measurements should indicate which type and size strike plate you require – whether it be an antique, square corner or rounded corner size – in order to purchase a compatible replacement. If uncertain, take down your measurements and visit a qualified shop for more advice on selecting a new strike plate for your door lock.

Measure the length of the strike plate

Measuring the length of the strike plate is an important step in order to ensure a proper fit when selecting a door lock. It is important to measure accurately so that the lock will have enough space and clearance to be properly installed. Before beginning, make sure you have the right tools; you will need a measuring tape and a pen.

Start by unfastening the screws securing the existing strike plate to the door frame and remove it from the frame. Measure the visible portion of its long side (from end to end) with your tape measure and record your measurement in inches or centimeters. This measurement should include any slots or notches that extend beyond the sides of the plate, as well as any lip or extension on either side of its opening (if present).

Next, make sure to note whether you need an offset strike plate. An offset strike has one side that is raised above or depressed below flush with its other side. In cases where this extension is necessary, measure how far out from flush it goes on each side and record these measurements as well.

Once you have all your measurements recorded, use this information when selecting a new strike plate for installation in accordance with manufacturer specifications for specific types of locksets or hardware – Door knob sets , mortise hardware, etc. Make sure that your new strike plate will match up properly with existing keyholes and pinset configurations in order for its installation to be successful.

How to Measure for a Door LockCheckout this video:

Share this Article