Is the duty factor the same as a service factor?

No. The duty factor here is your estimate of how much the load rises with viscosity and startup. A motor's service factor is the manufacturer's short-term overload allowance, commonly 1.15, and a steady load near the nameplate is best kept out of it.

What load should I enter for a viscous product?

Start from the vendor's load curve at your speed and specific gravity, then raise it by the measured jump when the batch thickens. A wattmeter reading on a like batch is better than a nameplate estimate.

Why compare the load with a motor rating?

The nameplate rating is the highest power the manufacturer allows through the motor. A load above it runs hot and trips, so the headroom row tells you whether the batch is safe before you charge it.

Does the energy row cover the whole mixing step?

It covers steady mixing at one average load for the entered hours. It leaves out startup, stops, cleaning cycles and any drive losses, so treat it as the mixing portion of the step's energy.

Process Manufacturing calculator

Mixer Power Load Calculator

Check the power a mixing step puts on the motor before the batch starts. The load share and headroom show whether the installed drive can carry the product at speed.

What this calculator does

Mixer load from the agitator load and duty factor, the energy over the run, and how much of the motor rating it uses.

Formula used

Mixer power load = agitator load × viscosity and duty factor
Energy consumed = mixer power load × mixing runtime
Motor rating headroom = motor nameplate rating − mixer power load
Load share of motor rating = mixer power load ÷ motor nameplate rating × 100

Inputs explained

Agitator Load: Vendor load curve or measured draw for this product at speed.
Viscosity and Duty Factor: Covers the viscosity rise and startup above the vendor curve.
Mixing Runtime: Planned hours the agitator runs for this step.
Motor Nameplate Rating: Nameplate rating of the installed mixer motor.

How to use the result

Best suited to checking a drive before a thick batch, costing mixer energy for a run, sizing a replacement motor.
A motor can carry a short overload inside its service factor, which this steady check does not model. Does not include starter, gearbox or variable frequency drive losses.

Current U.S. benchmarks

The producer price index for industrial chemicals stands at 336.006 (BLS, Aug 2026), up 13.3% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).

Common questions

Is the duty factor the same as a service factor? No. The duty factor here is your estimate of how much the load rises with viscosity and startup. A motor's service factor is the manufacturer's short-term overload allowance, commonly 1.15, and a steady load near the nameplate is best kept out of it.
What load should I enter for a viscous product? Start from the vendor's load curve at your speed and specific gravity, then raise it by the measured jump when the batch thickens. A wattmeter reading on a like batch is better than a nameplate estimate.
Why compare the load with a motor rating? The nameplate rating is the highest power the manufacturer allows through the motor. A load above it runs hot and trips, so the headroom row tells you whether the batch is safe before you charge it.
Does the energy row cover the whole mixing step? It covers steady mixing at one average load for the entered hours. It leaves out startup, stops, cleaning cycles and any drive losses, so treat it as the mixing portion of the step's energy.

Last reviewed 2026-10-01.