Bengala
Best cheap projector for projection mapping
Published October 8, 2026
Short answer. Skip the rankings and read the spec sheet. For a window, or an object indoors in a dark room, look for 300 or more ANSI lumens, native 720p or better, an HDMI input and a throw ratio near 1.2 to 1.5. Outdoors you need much more: 1,000 or more for a one-car garage door, 2,000 or more for a two-car door and 3,000 or more for a whole house front. A real projector with 300 ANSI lumens often costs around $150 to $400. Far less than that, and the brightness number on the box is probably not ANSI.
This page does not rank projectors. Models are replaced every few months, and listings change after the reviews are in. Many “best of” lists are written mostly to earn a commission. What lasts is knowing which numbers matter. The prices here are rough and will drift, so check current ones.
1. Brightness: ANSI lumens, not the big number
Lumens measure how much light the projector puts out. The trouble is that there are several ways to measure it, and cheap listings use the most flattering one. A box that says 12,000 lumens can be a 200 ANSI lumen projector. ANSI lumens is a standard test. If the spec sheet does not say ANSI, assume the number is inflated.
How much do you need? Divide lumens by the area you light, in square meters, to get lux. Lux is what the surface receives.
| Job | ANSI lumens | Why |
|---|---|---|
| An object indoors, like a pumpkin or a box, in a dark room | 300 and up | A small area, in the dark |
| A window at night, from inside | 300 and up | Light passes through a translucent layer, and the room is dark |
| A one-car garage door outside | 1,000 and up | About 5 square meters, and some stray light |
| A two-car garage door | 2,000 and up | About twice the area |
| A whole house front | 3,000 and up, more near a streetlight | A much bigger area, and dark brick reflects little |
An example. A one-car garage door is about 2.4 meters wide and 2.1 meters tall, which is 5 square meters. A 1,000 lumen projector gives it about 200 lux. A two-car door has twice the area, so it needs 2,000 lumens for the same result. As a rule of thumb, aim for about 200 lux outdoors on a light surface, and more on dark brick, because it reflects a fraction of what white paint does. That is a working rule, not a standard.
Also expect a streetlight or porch lamp to eat into all of it, so go higher near one. Darkness matters as much as lumens.
2. Throw ratio: how far back it has to sit
Throw ratio is the distance from the lens to the surface divided by the width of the picture. A ratio of 1.2 means you need 1.2 meters of distance for every meter of width. One meter is about 3.3 feet.
| Throw ratio | Distance for a 1.2 m wide window | Distance for a 3 m wide wall |
|---|---|---|
| 0.8 | 1.0 m | 2.4 m |
| 1.2 | 1.4 m | 3.6 m |
| 1.5 | 1.8 m | 4.5 m |
| 2.0 | 2.4 m | 6.0 m |
Most small projectors sit between 1.2 and 1.5. If your room is tight, look for a lower number. Zoom helps, but digital zoom shrinks the picture and wastes resolution, so prefer optical zoom or just move the projector. You do not need keystone correction, because mapping already straightens the picture.
3. Resolution: native, not supported
Native resolution is how many pixels the lens actually draws. “Supports 4K” often means the projector accepts a 4K signal and shows it at 480p or 720p. Check the line that says native.
- 480p: soft. Avoid unless it is nearly free.
- 720p: fine for glowing effects, fire, eyes in the dark. From a few meters away you will not miss the extra pixels.
- 1080p: worth it if you map crisp lines, text or logos, or if the shape is large.
- 4K: not needed for this.
4. Inputs: HDMI first
For a wired connection you need an HDMI input. Plenty of the very cheapest pocket projectors only take USB or AV and cannot be used. For wireless, look for the word AirPlay, not just “wireless display”. See AirPlay vs HDMI. An Apple TV on the HDMI port gives any projector AirPlay.
5. Black level: the gray rectangle
No projector shows black. It shows the dimmest picture it can make, and in a dark room that is a faint gray rectangle on the wall. Expect it. Cheap projectors usually show more of it than good ones. What helps:
- Choose a projector with a decent stated contrast, and test it in the dark before you commit.
- Use eco mode. It lowers the gray and the fan noise.
- Keep the shape inside the surface, move the projector back until the beam is only a little bigger than the target, and hang black cloth or card around the edges.
The rest, quickly
- Fan noise. Listed in decibels. Under 35 dB is quiet. Outdoors it hardly matters. Next to a bed it does.
- Lamp life. LED projectors usually claim 20,000 hours or more. At a few hours a night, that is not the limiting factor.
- Built-in speakers and smart apps. You are paying for things you will not use. Spend the money on lumens instead.
- Weather. A cheap projector is not weatherproof. Keep it dry, under a roof or in a ventilated box, and never seal it, because it needs airflow.
A checklist for the listing
- Does it state ANSI lumens, and is it 300 or more?
- Is the native resolution 720p or better?
- Is there a real HDMI input?
- Is the throw ratio listed, and does it fit your room?
- Can you return it within 30 days? Test it in the dark the day it arrives.
What we have not done
This page tests nothing. It tells you what to check. If a page lists the “10 best projectors” with a link under each, ask what they measured. Use the numbers above, buy somewhere with an easy return, and judge it in the room where it will live.
We do keep a short list of picks, with adapters, a cable and a stand, on the recommended gear page. It is where we put links to stores. Any affiliate link is marked as one, at the top of the page and next to the buttons. We have not tested those picks either: each one says who measured it, and says so when nobody did.
Ready to map something? Read the beginner’s guide.