A 48 in dining table
A round fixture starts at 24–32 in across. Try a candidate diameter to compare the edge margin.
Lighting size calculator
Find the right size, spacing and hanging height for your space.
- 6 spaces to explore
- Inches & centimeters
- Live layout preview
01 / MAKE IT YOUR SPACE
Start with the space below your light
Choose a scene. Only the measurements for that layout will appear.
02 / SEE WHAT THE NUMBERS MEAN
Try a familiar setup
Choose a room, load an example and adjust the measurements to suit your space.
An 84 in kitchen island
Two 16 in shades and 12 in end margins leave 28 in between shades, with centers 44 in apart.
A 12 × 14 ft living room
The room-scale starting diameter is 26 in. Use the seating zone if it defines a smaller area.
A bedroom with a 9 ft ceiling
A chosen 84 in floor clearance leaves a 24 in installed-drop limit. Check the complete assembly.
A tall entryway
A 144 in mounting height and chosen 96 in clearance leave a 48 in drop limit.
A staircase with two positions
Mounting heights of 144 and 132 in, each with 96 in clearance, make 36 in the tighter drop limit.
03 / BEFORE YOU MEASURE
Measure the space, then the whole light
A shade edge, an electrical center and the bottom of a fixture are different reference points.
How to use this lighting calculator
- Choose the space and fixture layout.
- Enter your dimensions, or load an example and replace its measurements.
- Read the size, spacing or drop result, then compare the complete dimensions of a candidate fixture.
Replace each example value with your own measurements before comparing a fixture.
Room, table or island?
For a room, measure the lighting zone’s length and width. For a dining table, use its width or diameter for a round light, and its length for a linear light. For an island, also measure full shade widths and the distance from each end to the nearest shade edge.
Body height is not installed drop
Measure from the ceiling mounting point to the lowest part of the complete fixture. Include the canopy, connectors and suspension. For stairs, measure vertically to every affected step or landing from the same mounting point.
04 / KNOW WHAT IS BEING CALCULATED
Simple formulas. Clear assumptions.
Proportion guidelines offer a starting point. Geometry describes the layout you enter. Neither selects a fixture for you.
Length + width
Add room length and width in feet. Use that number as a starting diameter in inches.
12 + 14 → 26 in
Kichler guidelineFollow the surface
Round light: ½–⅔ of table width. Linear light: ⅓–½ of table length.
48 in round → 24–32 in
Artcraft & KichlerEdges before centers
Gap = (island length − two end margins − all shade widths) ÷ number of gaps.
Center spacing = gap + shade width
Equal-width pendants in one straight row.
Account for the full drop
Drop = ceiling height − table or counter height − your chosen gap.
96 − 36 − 34 = 26 in
Optional: explore area and target illumination
Size and brightness answer different questions. This separate estimate multiplies area by a target in foot-candles to describe light reaching a reference plane. It does not predict a fixture’s delivered illumination or required rated lumen output.
The dining example uses 10 foot-candles from Kichler’s 10–20 foot-candle discussion. Distribution, surface reflectance, maintenance and task lighting are not modeled. No universal target is assigned to other scenes.
05 / QUICK REFERENCE
Check a few common dimensions
These are transparent examples of the formulas above, not product specifications.
| Table width | Fixture diameter |
|---|---|
| 36 in / 91.4 cm | 18–24 in / 45.7–61 cm |
| 48 in / 121.9 cm | 24–32 in / 61–81.3 cm |
| 60 in / 152.4 cm | 30–40 in / 76.2–101.6 cm |
| Table length | Fixture length |
|---|---|
| 60 in / 152.4 cm | 20–30 in / 50.8–76.2 cm |
| 72 in / 182.9 cm | 24–36 in / 61–91.4 cm |
| 84 in / 213.4 cm | 28–42 in / 71.1–106.7 cm |
| Inputs | Result | Type |
|---|---|---|
| 12 × 14 ft room | 26 in starting diameter | Proportion guideline |
| 84 in island; two 16 in shades; 12 in end margins | 28 in shade gap; 44 in center spacing | Geometry |
| 96 in ceiling; 36 in counter; 34 in chosen gap | 26 in overall installed drop | Geometry |
A linear fixture over an island uses the table-length guideline as a comparison only. Check actual footprint, shade shape and working sightlines.
06 / FROM NUMBERS TO A LIGHT YOU LOVE
Use your result to check a candidate
Two lights with the same width can feel very different. Open arms and clear glass look lighter than a dense or solid shade.
- Compare the full outline. Include shades, arms and any parts extending beyond the main body.
- Check the installed range. Confirm canopy and suspension dimensions, adjustment increments and included hardware.
- Check the view through the room. Consider seated sightlines, cabinet doors, circulation and nearby fixtures.
- Confirm the installation. Review the actual product instructions, mounting conditions and requirements with your installer.
07 / TAKE THE NEXT STEP
Explore lights and deeper guides
Chandeliers
Compare silhouettes and dimensions for a room or dining table.
Browse chandeliers ↗Chandelier sizing guide ↗Kitchen island lighting
Look closer at shade sizes, layout and the view across your island.
Browse island chandeliers ↗Kitchen island lighting guide ↗Hanging height
Understand the difference between fixture dimensions and installed height.
Browse pendant lights ↗Chandelier hanging-height guide ↗Dining room
Choose a light for your table and room.
Dining room chandelier guide ↗Living room
Size a chandelier around your seating area.
Living room chandelier guide ↗Bedroom
Compare fixture scale and floor clearance.
Bedroom chandelier guide ↗Foyers & staircases
Check mounting height and every affected walking position.
Foyer and staircase chandelier guide ↗Linear chandeliers
Compare full length, width and edge margins.
Linear chandelier size guide ↗08 / A FEW GOOD QUESTIONS
Lighting size calculator FAQs
How do I calculate a chandelier size for a room?
Add the room’s length and width in feet, then use the total as a starting diameter in inches. A 12 × 14 ft room gives 26 in. For a light centered over a table, start with the table dimensions instead.
What size chandelier works over a 48-inch round table?
The ½–⅔ table-width guideline gives a starting diameter of 24–32 in. Compare the complete fixture outline and its visual weight before choosing.
How far apart should two lights be over an 84-inch island?
There is no single spacing without shade width and end margins. With two 16 in shades and a 12 in margin from each island end to the nearest shade edge, the clear gap is 28 in and the centers are 44 in apart. The centers sit 20 and 64 in from the same end.
Is center spacing the same as the gap between shades?
No. For equal-width shades, center spacing equals the clear shade gap plus one shade width. Existing electrical centers can be checked using the “Keep existing center positions” island mode.
How high should a pendant hang above a table or island?
A 30–36 in gap is a common design starting point. Choose a gap for the actual fixture, sightlines and space. This tool uses your chosen gap; it does not automatically raise the light by a fixed amount for each extra foot of ceiling height.
Can a body-height measurement tell me whether a light fits?
No. The complete installed length also includes suspension, connectors and canopy. Compare the required drop with the product’s actual installed range and available adjustment steps.
How does the staircase calculation work?
Each entered step or landing produces a drop limit: mounting height above that surface minus your chosen clearance. The smallest limit governs the entered positions. Other positions and the fixture’s full outline still need to be checked.
Does a larger chandelier always give more light?
No. Fixture dimensions do not establish lumen output, beam distribution or illumination on a surface. Use verified lighting specifications and consider the room’s other light sources.
09 / METHODS YOU CAN TRACE
Sources & calculation notes
Tool by Toplightstore. Manufacturer proportions provide design starting points; spacing and drop use your measurements. Contact us about a fixture’s listed dimensions.
Methods last reviewed: . The proportional rules below come from published manufacturer guidance. Spacing, margins and drop calculations use the dimensions you enter.
- Kichler — Chandelier Planning & Selecting Tips: room diameter, linear table proportions and the optional dining illumination example.
- Artcraft — Choosing a Chandelier Size for Your Dining Room: round fixture proportion and tabletop gap.
- Visual Comfort — Pendant Height Over a Kitchen Island: island hanging-height context.
This tool is a planning aid. A proportional starting range is not a required clearance or a guarantee that a specific light will fit. Installation conditions and local requirements are outside its scope.
A SECOND PAIR OF EYES
Have a light in mind?
Share its product link, your measurements and your copied results so our team can help you check the listed dimensions.