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Tools · TOOL · REV 2026-10-06

Throw ratio calculator

The lens is chosen from room geometry: where the projector can sit, and the image width the sightline decided.

What this gate is

Throw ratio = lens-to-screen distance ÷ image width. The three numbers are one equation.

It does not calculate lens shift, screen curve, lumens, or the shadow of a hung object.

What is published now

  • The equation is visible

    The calculator writes the law above the result so it can be checked.

  • Limits are written

    Each tool names what it ignores: the room, the code, or the manufacturer’s sheet.

  • An editable example

    The starting values are for understanding. Change them to your project, then discard the result when a measurement arrives.

When to open this gate

  • Before a meeting

    To turn a verbal dispute into a calculation whose assumptions everyone can see.

  • Not in a tender

    A result from this page is not pasted into a bill of quantities.

How to read the subject

  1. 01

    A ratio of 1.2 and a width of 4 m means about 4.8 m from lens to screen, not from the rear wall to the stage without a measurement.

  2. 02

    Read the warning under the result. If the assumption does not apply, stop.

  3. 03

    Replace any textbook coefficient with a laboratory sheet or a measurement.

  4. 04

    Ask it again inside the project brief: what is success, and in which room condition?

What this gate does not do

  • Copying the figure

    A figure without the volume, the distance, or the condition is meaningless in a contract.

  • Mixing tools

    Adding decibels is not RT60, and throw ratio is not brightness.

THROW RATIO

Throw ratio

Throw ratio = lens-to-screen distance ÷ image width. Fill two fields and the third is calculated. Lens shift, screen curve, and image brightness are not calculated.

Ratio
1.20
Distance
12.00m
Width
10.00m

A preliminary figure for understanding and comparison. Not a measurement, not an acoustic model, and not something to paste into a specification or a quotation.

Questions designers and owners ask

Is the result approved?

No. It is a preliminary calculation on a stated assumption.

Why are there no product numbers?

Because a product’s performance is copied from its test report, not from an article.

Can I save the calculation?

Copy the result into the study brief. The page does not send it to a server.

Technical sources

  • The law written inside the tool

    The law written inside the tool

  • ISO 3382-1 and IEC 60268-16 when the subject is the room

    ISO 3382-1 and IEC 60268-16 when the subject is the room

  • The local code and the manufacturer’s sheet

    The local code and the manufacturer’s sheet

Last editorial review: 2026-10-06. Review means the text was checked, not that a project was measured.

Turn the question into a brief

A study starts from room volume, use, and existing condition, not from a product name. Fill the brief and copy it.

Project study form