Unit Conversion

Unit conversion lets Blynk automatically display sensor values in a different unit than what your device reports — without changing the data your device sends or how it's stored.

For example, a device that reports temperature in °C can show values to users in °F. A flow sensor reporting in l/min can display readings in CFM. No firmware changes needed.

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How it works

Each datastream has a base unit — the unit your device sends. When conversion is enabled, Blynk shows that value in the user's preferred unit using one of two methods:

• Formula — Blynk applies a conversion formula to the value (for example, °C → °F). This is the default.

• Paired datastream — if the device already streams the same measurement in two units on separate pins (for example, V1 = °C, V2 = °F), Blynk reads the matching datastream directly instead of calculating.

Note: Conversion changes only how values are displayed. The raw value stored on server is always the value your device sent, so historical data, the API, and exported reports remain in the device's original (base) unit.

Enabling conversion per datastream

Conversion can be turned off for an individual datastream in the Units tab of Datastream Settings. The toggle appears only when the selected unit is convertible, and is on by default. When off, that datastream always displays in its base unit regardless of the user's unit system.

Unit conversion levels

Unit preferences can be set at multiple levels: per user, per device, per organization, or per template — with more specific settings taking priority.

Priority	Level	Set by	Purpose
1 (highest, if added will override all other levels)	Unit Conversion Switch (device metadata)	Manufacturer	Keep the app in sync with a unit toggle on the device itself
2	User preference	End user	"I prefer Imperial"
3	Organization	Org admin	Company-wide default
4 (lowest)	Template default	Manufacturer	The unit a product ships with

Smart Unit Scaling

Beyond converting between systems, Blynk can automatically scale a value to the most readable unit within the same system — showing 2.5 kg instead of 2500 g, or 45 kW instead of 45000 W. Some quantities scale as a single decimal value; others that read more naturally in two parts (time, imperial length and mass) display as a composite, like 2 days 19 hr or 5 ft 8 in.

Smart scaling is a display-only convenience and never changes the stored value. It can be toggled on the Units tab of Datastream Settings. The toggle appears only when the selected unit supports smart scaling, and is enabled by default.