Physical Multi Field

Physical Multi Field solves a problem that comes up constantly on recipe and ingredient-list sites: a single quantity needs to be able to hold very different kinds of measurements from one row to the next. One ingredient is
a weight ("250 g flour"), another is a volume ("1.5 l stock"), another is a
plain count ("3 eggs"), and another is a named size ("1 large onion"). Drupal
core has no field type for this, and the popular Physical module locks
each field to a single measurement type, which forces site builders to add a
separate field for weight, a separate field for volume, and so on, and then
hide whichever ones don't apply to a given item. Physical Multi Field solves
this by providing one field type that stores the measurement type alongside
the quantity and unit on every individual value, so a single field can
represent any of these ingredient quantities side by side.

Features

• One field type, four measurement kinds: weight, volume, plain count, and
  custom named sizes, chosen per value rather than being fixed per field.
• Reuses the Physical module's unit definitions and bcmath-based
  conversion engine for weight and volume, so unit math (grams to ounces,
  liters to cups, and so on) is accurate and consistent with any other
  Physical-powered fields on the site.
• Site builders choose which of the four measurement types are available
  on a given field, can restrict the offered units for weight and volume, and
  can define their own list of size labels (for example Small, Medium,
  Large).
• The default widget presents a single quantity input alongside one unit
  select, grouped into optgroups by measurement type — there's no
  JavaScript-dependent "pick a type, then pick a unit" two-step interaction to
  keep in sync.
• The default formatter displays the stored value with locale-aware
  number formatting, and can optionally convert weight and/or volume values to
  a chosen display unit (for example, always show weight in kilograms even
  when some values were entered in ounces).
• Well suited to recipe websites, ingredient lists, product specification
  fields, or any content type where quantities naturally come in different
  measurement dimensions.

Post-Installation

After enabling the module (and its dependency, Physical), add a field of
type "Quantity (weight, volume, count, or size)" to any bundle from
Manage fields, exactly as you would add any other field.

On the field storage settings form, select which measurement types
(weight, volume, count, size) editors will be able to choose from for that
field — at least one is required:

• If Weight or Volume is enabled, you can optionally restrict which units
  are offered; leaving all of a type's units unchecked allows every unit for
  that type.
• If Size is enabled, enter one size label per line (for example Small,
  Medium, Large). Each line becomes a selectable option.

On the field instance's Manage form display tab, the default
"Quantity and unit" widget needs no special configuration beyond the usual
widget settings (placeholder text, input width, and whether to visually hide
the field labels).

On the field instance's Manage display tab, the default
"Quantity and unit" formatter can optionally be configured with a weight
and/or volume output unit, to always display those measurement types in a
specific unit regardless of what was entered. Count and size values are
unaffected by these settings.

Note: because a single field can mix weights, volumes,
counts, and sizes, sorting or filtering a view by the field's raw quantity
is not meaningful without first restricting to a single measurement type
(via a Views contextual or exposed filter on measurement_type).
This module does not ship that Views integration.

Additional Requirements

This module requires Physical,
which provides the weight and volume unit definitions and conversion math
this module builds on. Beyond that and Drupal core's Field module, there are
no other dependencies.

Recommended modules/libraries

None beyond the required Physical module. Since Physical Multi Field does
not ship a Views integration for mixed-dimension sorting/filtering, Views
(included in Drupal core) is worth combining with a contextual or exposed
filter on measurement_type if you need to filter before sorting
numerically.

Similar projects

Physical provides
field types such as physical_measurement for weight, volume,
length, area, and other dimensions, but each field instance is locked to a
single measurement type. Physical Multi Field is built on top of Physical's
conversion engine and is intended for the opposite case: when a single field
needs to hold several different measurement types across its individual
values — as with a list of recipe ingredients — rather than one consistent
measurement type across the whole field.

Community Documentation

See the module's README.md and AGENTS.md for a deeper look at the
configuration workflow and the architectural reasoning behind storing the
measurement type per value instead of per field.