How to Measure for a 20-Inch Gas Range? | Get the Right Fit

A 20-inch gas range fits an opening roughly 20 inches wide, but you must measure width, depth, and height at multiple points and use the smallest reading.

Installing a 20-inch gas range starts with accurate measurements, not assumptions. A “20-inch” range rarely measures exactly 20.0 inches—the Hotpoint RGAS200DMWW, for instance, spans 19 3/4 inches wide. Taking precise measurements of the opening and the delivery path prevents a frustrating return and a wasted afternoon. Here’s the exact process.

What Are The Actual Dimensions Of A 20-Inch Range?

Manufacturers build 20-inch class ranges to fit a standard 20-inch cabinet opening, but the appliance’s physical size varies by model.

You also need room for the range’s depth and height.

How To Measure The Opening In Three Dimensions

Measure the kitchen opening in three directions—width, depth, and height—and whenever the opening is uneven or varies front-to-back or side-to-side, use the smallest reading. This rule alone prevents most fit failures.

For width, measure the opening between cabinets or countertops at both the front and the back. If the numbers differ, use the smaller one. For depth, measure from the back wall to the front edge of the cabinets or countertop—never to knobs or handles. If the area is not square, take more than one depth reading and again use the smaller value.

For height, measure from the floor to the top of the countertop on both sides, and if possible front and back, to catch a sloped floor. Use the lowest height if readings differ. A floor that drops a quarter inch across the opening can make a tight fit impossible, so the lowest number is the one that matters.

What Else Must You Check Before Buying?

The opening dimensions are only half the job. Check for countertop overhangs, cabinet doors, hinges, trim, and molding that could stop the range from sliding fully into place. Remove the old range if possible, and unplug it or turn off the gas before moving it, so you can measure the opening accurately.

Confirm there is room for the gas line connection. Gas ranges need an accessible line, and if the connection point falls outside the model’s clearance zone, installation may not be possible without relocating the line. Also verify the delivery path: measure doorways, halls, and turns from the appliance entrance to the kitchen so the range can actually be moved into position once it arrives.

Check the specific model’s installation instructions for exact clearance requirements, since they vary between models. Before you commit to a purchase, our tested picks for the best 20-inch gas ranges can help you compare your options.

Get The Fit Right The First Time

Measure the opening at multiple points, use the smallest width, depth, and height readings, and verify the delivery path before ordering. Check the spec sheet for the exact model you want—the Hotpoint RGAS200DMWW spec page at GE Appliances lists the precise dimensions, and a current 20-inch compact gas range from Avanti or Impecca may differ slightly. The range should match your countertop height and leave clearance for the gas connection and ventilation. When all three dimensions check out against the manufacturer’s required cabinet opening, your new range will slide into place without a fight.