Chandelier Size Calculator — Diameter, Height & Hang Rules

What size chandelier for your room? Size the diameter from the room rule, match it to your dining table, solve the hang height and chain drop, plan two-story foyers and kitchen islands, and check brightness — 7 modes in one free tool.

Room Diameter Sizer

The room rule taught across lighting guides: add the room's length and width in feet, read the total as inches — that is your baseline chandelier diameter. Low ceilings (under 8.5 ft) take 10% off; high ceilings (over 10 ft) add 10–20%.

Examples: 12×14 ft → 26″ · 10×12 ft → 22″ · 12×12 ft → 24″. The fixture body itself should be 2.5–3″ tall per foot of ceiling (20–24″ on 8 ft, 30–36″ on 12 ft).

Frequently Asked Questions

Not what you're looking for? (boundary guide)

A chandelier is a decorative hanging light fixture sized by diameter, drop, and hang height. These sibling tools cover the neighbors — each is a deliberately different intent:

Table Lamp Size Calculator

Table lamps sit, chandeliers hang — portable lamp sizing for nightstands, end tables, consoles, and desks: shade proportions, eye-level glare check, and pair matching. No ceiling-drop math here.

Ceiling Fan Size Calculator

A ceiling fan circulates air — blade span, downrod, and CFM. It produces no light design of its own. Different physics, different tool.

Recessed Lighting Calculator

Can-light layout planning for lights flush in the ceiling — spacing grids and fixture counts, not hanging fixtures.

Mirror Size Calculator

Wall decor sizing — mirrors hang on walls and follow furniture-width rules, not ceiling-drop math.

Curtain Size Calculator

Window treatments — panel width, length, and stack rules for windows, unrelated to overhead lighting.

Sourcing: the diameter rule (L+W ft → in) and hang rules converge across 10+ lighting guides — homesandgardens, schoolhouse, mirodemi, mh-lighting, coohom, lights4living, wayfair, modernchandelier, esperilux, seuslighting, designingidea, homebaa. Dining 1/2–2/3 (with the 3/4 variant flagged, not hidden); two-story sizing anchored to a published table value; the 15–30 lm/sq ft brightness band is a single-source planning estimate and is labelled as such. This tool is an educational estimator, not a substitute for a licensed electrician.

Free tool by NRTechStudio