What fill percentage should I use when sizing a mixing batch?

Most agitated tanks run best at 70 to 85 percent of geometric volume, so the liquid level covers the top impeller and leaves freeboard for vortex and foam. The Mixer Fill Percentage and Batch Size calculators back into a working volume from tank dimensions and target level. Low-viscosity blends tolerate the upper end; foaming or high-shear products stay lower to prevent splash-out and air entrainment.

How do I estimate blend time for a new formulation?

Blend time scales with tank turnovers, which depend on impeller pumping rate versus batch volume. The Blend Time calculator uses agitator throughput and the number of turnovers needed for homogeneity, typically 3 to 5 for low viscosity and more as viscosity climbs. Pair it with Agitator Power to confirm the drive delivers enough tip speed and flow to actually mix the full working volume in that window.

Why does my batch yield keep coming up short?

Yield loss usually hides in cling on tank walls and agitators, transfer line holdup, sampling, and off-spec reblends. The Yield Loss and Material Variance calculators quantify each against theoretical charge, and Scrap/Reblend Cost prices the rejected volume. A 2 to 4 percent loss is common; if you are above that, check heel remaining after drain, CIP flush recovery, and overfill splash before blaming the recipe.

How do I scale a lab batch up to a production vessel?

Use the Scale-Up Ratio calculator to hold a constant such as tip speed, power per unit volume, or blend time as volume grows. Equal power per volume keeps blending intensity similar but changes shear; equal tip speed preserves shear but under-blends the larger tank. Combine it with Agitator Power and Blend Time so the plant impeller reproduces the mixing the lab formula relied on.

What does a changeover and CIP cost per batch?

Changeover Cleaning Time plus CIP Cost capture the water, chemistry, energy, and labor to clean and re-sanitize between recipes, and that idle time is lost throughput. On short campaigns CIP can rival the batch cost itself. Run Tank Turnover and Throughput Per Shift to see how much cleaning frequency erodes capacity, then batch similar products back to back to cut the number of full cleans.

How is cost per batch calculated across labor, material, and energy?

The Batch Cost calculator sums raw material charge, Labor Per Batch from crew time across charge, blend, and drain, agitator energy from Agitator Power times run time, plus allocated CIP Cost. Divide by good yield to get true cost per unit. Recipe Margin then compares that against sell price so you can see which formulas carry the plant and which need reformulation or a price change.

Manufacturing calculator category

Mixing, Blending & Industrial Batch Processing calculators

Practical calculators for batch plants, process engineers, and formulation teams working with mixing and blending operations. Size each batch to the working volume of the vessel, model blend time and agitator power, check yield loss and reblend cost, and price out labor, material, and energy before the next run.

What this hub covers

Free calculators for batch plants and formulation teams covering batch sizing, mixer fill, blend time, agitator power, yield loss, CIP, and cost per batch.
Browse mixing, blending & industrial batch processing calculators for manufacturing planning, quoting, quality, capacity, and operations decisions.

Best calculators in this category

Batch Size: Size good batches per shift from output per batch, scheduled batches, mixer uptime, and first-pass yield.
Mixer Fill Percentage: Compare charge volume to mixer working volume and show the gap to target fill so the agitator stays inside its safe operating window.
Blend Time: Estimate blend time per batch from batch size, mixer throughput, and a process allowance for charging, sampling, and minor stops.
Ingredient Addition Rate: Compare an ingredient charge against the total batch mass and show the gap to the formulation target percent.
Changeover Cleaning Time: Estimate changeover cleaning time from wetted surface area, crew clean rate, and a CIP allowance for charge, drain, and verification steps.
Yield Loss: Compare lost batch mass against theoretical batch mass and show the gap to your yield loss ceiling.
Agitator Power: Estimate agitator energy cost per batch from connected motor load, runtime, electricity rate, and good batches produced.
Batch Cost: Build a defensible batch cost from material weight, blended material rate, capture factor, and fixed overhead per batch.
Throughput Per Shift: Estimate effective batch plant throughput from completed batch output, mixer runtime, and realistic line utilization.
Scale-Up Ratio: Translate a pilot batch into a production batch size using scale-up factor, geometric correction, and a process efficiency multiplier.
Viscosity Adjustment: Compare a current batch viscosity reading to the target spec and apply a process correction factor to plan thinner or thickener addition.
Powder Wet-Out Time: Estimate powder wet-out time from powder charge mass, mixer wet-out rate, and a process allowance for de-lump and hold time.

Common manufacturing problems solved

mixing
blending
batch processing
batch size
working volume
mixer fill
blend time
ingredient addition
batch yield
scale-up

Category questions

What fill percentage should I use when sizing a mixing batch? Most agitated tanks run best at 70 to 85 percent of geometric volume, so the liquid level covers the top impeller and leaves freeboard for vortex and foam. The Mixer Fill Percentage and Batch Size calculators back into a working volume from tank dimensions and target level. Low-viscosity blends tolerate the upper end; foaming or high-shear products stay lower to prevent splash-out and air entrainment.
How do I estimate blend time for a new formulation? Blend time scales with tank turnovers, which depend on impeller pumping rate versus batch volume. The Blend Time calculator uses agitator throughput and the number of turnovers needed for homogeneity, typically 3 to 5 for low viscosity and more as viscosity climbs. Pair it with Agitator Power to confirm the drive delivers enough tip speed and flow to actually mix the full working volume in that window.
Why does my batch yield keep coming up short? Yield loss usually hides in cling on tank walls and agitators, transfer line holdup, sampling, and off-spec reblends. The Yield Loss and Material Variance calculators quantify each against theoretical charge, and Scrap/Reblend Cost prices the rejected volume. A 2 to 4 percent loss is common; if you are above that, check heel remaining after drain, CIP flush recovery, and overfill splash before blaming the recipe.
How do I scale a lab batch up to a production vessel? Use the Scale-Up Ratio calculator to hold a constant such as tip speed, power per unit volume, or blend time as volume grows. Equal power per volume keeps blending intensity similar but changes shear; equal tip speed preserves shear but under-blends the larger tank. Combine it with Agitator Power and Blend Time so the plant impeller reproduces the mixing the lab formula relied on.
What does a changeover and CIP cost per batch? Changeover Cleaning Time plus CIP Cost capture the water, chemistry, energy, and labor to clean and re-sanitize between recipes, and that idle time is lost throughput. On short campaigns CIP can rival the batch cost itself. Run Tank Turnover and Throughput Per Shift to see how much cleaning frequency erodes capacity, then batch similar products back to back to cut the number of full cleans.

Last reviewed 2026-05-12.