Does this calculator reproduce the ISO 2768-1 tolerance tables?

No. The normative table values and boundary wording require the licensed governing edition. Enter the documented tolerance and its exact source location.

What is the current status of ISO 2768-1:1989?

As checked on 12 July 2026, ISO lists Edition 1 as Published at stage 90.92, to be revised. A second edition of ISO 2768 is under publication at stage 60.00.

What does the calculator determine?

It performs only the arithmetic L=N-t, U=N+t and W=2t using a tolerance supplied from controlled documentation.

Is ISO 2768-2:1989 current?

No. ISO lists Part 2 as withdrawn on 4 February 2021 and revised by ISO 22081:2021. Confirm the governing drawing and contract before changing legacy specifications.

Document-controlled dimensional arithmetic

ISO 2768-1 Documented Tolerance Limit Calculator

Enter a symmetric tolerance copied from the governing drawing, contract or licensed standard. The page calculates arithmetic limits; it does not reproduce, infer or certify the normative ISO 2768 tables.

L=N−tU=N+tTables: licensed source required

Documented tolerance arithmetic

Arithmetic interval

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Lower limit L

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Nominal value N

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Upper limit U

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Total interval width W

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Normalized tolerance

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Implemented arithmetic—not an ISO table lookup

Lower limit L=N−t
Upper limit U=N+t
Interval width W=U−L=2t

For a linear value,N and t are in millimetres. For an angular value,N is entered in decimal degrees and t may be entered in degrees,arcminutes or arcseconds;1°=60′=3600″. These equations only propagate a user-documented symmetric tolerance.

NEEDS_LICENSED_SOURCE: the former page reproduced two tolerance tables and selected values automatically. ISO states that ISO 2768-1:1989 contains three tables,while its public Online Browsing Platform exposes only informative material and requires purchase for the full normative content. The old values,boundary wording and omissions cannot be certified from the public card,so they were removed rather than guessed.

ISO 2768-1 status on 12 July 2026

ISO 2768-1:1989Edition1,published November1989. ISO status: Published;stage90.92,to be revised. The 2022 systematic review confirmed it before the revision project advanced.

ISO 2768,Edition2ISO status: Under publication;stage60.00 since2June2026. Do not treat a draft/under-publication text as the contract edition.

Official records: ISO 2768-1:1989 product page и ISO 2768 Edition2 project page.

Publicly verifiable scope

The official ISO Online Browsing Platform states that Part1 applies to linear and angular dimensions without individual tolerance indications,for parts produced by metal removal or formed from sheet metal. It covers specified categories of linear/angular dimensions and machined assembled parts. It excludes dimensions governed by another general-tolerance standard,auxiliary dimensions in brackets and theoretically exact dimensions in rectangular frames. This is narrower than “all untoleranced dimensions”.

Geometrical-tolerance legacy note

ISO 2768-2:1989 was withdrawn on4February2021;ISO lists it as revised by ISO 22081:2021,which remains current and was confirmed in2026. Do not reuse legacy combined class notation as if Part2 were current;interpret or migrate a legacy drawing through its governing contract and current GPS rules.

Why the former lookup was removed

One default nominal dimension drove both a linear-size table and the shorter-side input for an angular tolerance,even though they are different quantities. At exactly10mm,the code selected the next angular row while the displayed first row said “≤10”. Labels “upper limit” and “lower limit” displayed only +t and −t instead of N+t and N−t. Defaults,presets,local history,unsupported process-to-class advice and “class m when in doubt” guidance were also removed.