Understand Advanced Formulas Between Meters
Last updated on Aug 28, 2026
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This feature is currently in beta and may change over time. During the beta period, functionality, availability, and performance may vary.
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Combine multiple Maxio Metering signals into one billable quantity for usage-based billing. Advanced Formulas let you calculate charges from related Meters, such as reads, writes, API calls, storage, compute, or included usage thresholds.
Advanced Formulas Between Meters lets you define a mathematical expression that combines multiple Meters into a single billable quantity. Instead of creating separate Products to approximate a blended rate, you write the billing logic directly on the Product:
- Bill on total I/O:
[reads] + [writes] - Blend weighted usage types:
[api-calls] * 0.01 + [storage] * 0.05 - Charge only above an included threshold:
MAX([usage] - [included], 0)
The formula is evaluated at billing time using actual Meter values, producing a single quantity that drives the Invoice line item.
Requirements
Before using Advanced Formulas Between Meters, confirm the following are in place:
- Maxio Metering is enabled on your site. Formula Meters are not compatible with Legacy metering.
- At least one Meter is defined on your site.
- All member Meters belong to the same Stream, share the same Segment Group, and share the same periodicity.
- The
meter_formulafeature is enabled on your site. Contact Maxio Support to request access during Early Access.
Key concepts
| Term | Definition |
|---|---|
| Formula Meter | A saved mathematical expression combining multiple member Meters. When attached to a billing Product, the formula result is used as the charge quantity. |
| Member Meter | An individual Meter referenced within a formula expression, identified by its handle in bracket notation. |
| Formula Expression | The user-authored expression that defines the billing logic, for example [reads] + [writes] or [api-calls] * 0.01 + [storage] * 0.05. |
A Formula Meter must reference Meters that all belong to the same Stream and share the same Segment Group. Cross-stream formulas are not supported.
Related information
To create a Formula Meter, see Use Advanced Formulas Between Meters.
For formula syntax used within a display-only Metered Field instead of a billing Product, see Use Advanced Formulas with Metered Fields.
For general Metering setup, see Understand Maxio Metering.
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