A lampshade can make a bedside lamp feel beautifully finished, or slightly out of place. The right lampshade size chart takes the guesswork out of choosing: it helps you balance the height of the base, the width of your bedside table and the amount of soft light you want for the evening.
For a bedroom, proportion matters as much as style. A shade that is too small can leave a lamp looking top-heavy and expose the bulb’s glare. One that is too wide may crowd a compact table or block your view across the bed. A few simple measurements will help you create a cosy, considered look without making the choice feel technical.
Lampshade Size Chart for Bedside Lamps
Use the height of the lamp base, measured from the bottom of the base to the bulb holder, as your starting point. The shade diameter is the width across its widest point, usually the bottom edge of a drum or empire shade.
| Lamp base height | Suggested shade diameter | Suggested shade height | Best for |
|---|---:|---:|---|
| 20-28 cm | 20-25 cm | 14-18 cm | Small bedside tables, shelves and compact guest rooms |
| 28-38 cm | 25-35 cm | 18-23 cm | Most standard bedside lamps and everyday bedroom schemes |
| 38-50 cm | 35-45 cm | 23-30 cm | Larger tables, statement bases and spacious bedrooms |
| 50 cm or more | 45-55 cm | 30-38 cm | Tall lamp bases, wide chests of drawers and feature lighting |
These are useful guide ranges rather than fixed rules. A wide, rounded ceramic base may suit a more generous shade than a slim metal base of the same height. Equally, a narrow bedside table may call for a slightly smaller diameter, even if the lamp itself could carry a larger one.
The two proportion rules that usually work
For a balanced bedside lamp, aim for a shade diameter that is close to the height of the base. So, if your base measures 32 cm to the fitting, a shade around 28-35 cm wide will usually look right. This gives the lamp a settled, comfortable shape without making the shade appear pinched or oversized.
The shade height should generally be around two-thirds of the base height. On a 30 cm base, a shade around 18-22 cm tall is a natural starting point. This keeps enough of the base visible for its colour, texture or decorative detail to make an impact.
There is one practical check worth making before you order: when you sit or lie in bed, the bottom of the shade should sit around eye level or a little below. This helps shield the bulb from direct view while still giving you useful light for reading, winding down or finding your mobile phone charger after dark.
Measure your bedside table too
A lamp does not sit in isolation. Its shade needs room to breathe on the table, particularly in a smaller bedroom where every centimetre counts.
As a comfortable guide, keep the shade diameter within the width of the bedside table. If your table is 40 cm wide, a 25-35 cm shade is likely to feel well proportioned. A 45 cm shade might technically fit, but it can look crowded and leave less useful surface space for a book, glass of water or mobile phone.
For narrow tables, consider a slim lamp base with a smaller drum shade, an oval shade, or a wall-mounted bedside light. These options can still bring a warm evening atmosphere without taking over the surface. Touch lamps and rechargeable lamps are especially useful where you want fewer cables and easier control from bed.
Choose the shade shape before finalising the size
The same diameter can look completely different depending on the shade shape. A straight-sided drum shade has a clean, contemporary feel and gives a fuller pool of light below. It works particularly well with Scandinavian, modern and minimalist bedside lamps.
An empire shade is wider at the bottom than the top. Its tapered outline suits traditional, rattan, ceramic and more decorative lamp bases, while its narrower top can make a compact bedroom feel less visually busy. Because the bottom edge is the widest point, use that measurement when checking the chart.
Oval and rectangle shades are practical when a lamp sits close to a wall, headboard or framed artwork. They project less deeply than a round shade of similar width, so they can be a smart choice for a narrow table. Measure the front-to-back depth as well as the side-to-side width before choosing one.
How shade size changes the light in your bedroom
A larger shade does more than change the look of a lamp. It spreads light over a wider area and often gives the base a softer, more relaxed presence. This can be lovely on a generous bedside table, especially with a warm white LED bulb for reading and relaxing.
A smaller shade creates a more focused glow and can make a petite lamp feel neat and intentional. It is often the better option for a child’s room, a guest room, or a compact bedside setup where ambient light matters more than strong task lighting.
Material also changes the result. Linen, cotton and lightly textured fabric shades gently diffuse the bulb for a calm, cosy effect. Darker shades direct more light up and down, which can feel dramatic but may be less useful if your bedside lamp is your main reading light. A pale inner lining will usually make the most of a lower-energy LED bulb.
Check the fitting, not just the measurements
Before selecting a replacement shade, check how your existing lamp holds it in place. Many UK table lamps use a shade that rests on the lampholder, but the fitting size can vary. Some shades include a reducer ring, while others are made for a specific fitting. Clip-on shades and harp fittings need a different approach again.
Look at the product specification for the fitting type and measure the opening in your current shade if you are replacing like for like. If you are choosing a complete bedside lamp, this part is already taken care of, allowing you to focus on the size, colour and atmosphere you want.
Also check that the shade leaves enough clearance around the bulb. The bulb should not touch the fabric or sit too close to the top. LED bulbs are a sensible choice for bedroom lamps because they use less energy and run cooler, but the lamp’s stated maximum wattage should always be followed.
Common lampshade sizing mistakes
The most common mistake is choosing by appearance alone. A beautiful 40 cm shade may look perfect in a photograph, yet overwhelm a 30 cm bedside table at home. Measure the table, the base and the available space beside your bed before being guided by the image.
Another is focusing only on width. A very shallow shade can make a tall base look exposed, while an overly tall shade can hide the base and reduce the lamp’s decorative character. Use both diameter and shade height from the chart for a more reliable match.
Finally, think about the lamp’s job. If it is mainly for a soft night-time glow, a smaller fabric shade and a dimmable bulb can be ideal. If you read in bed most evenings, choose a shade wide enough to spread light comfortably and position it at a useful height beside your shoulder.
Let your bedroom set the final scale
Your lampshade should echo the room rather than compete with it. A compact, softly coloured shade can bring calm to a small bedroom, while a larger linen, rattan or textured design can add warmth and presence to a wider bedside setup. When the measurements feel balanced and the light feels gentle at the end of the day, you have found the right fit.