Why use a multi-step mash?

Multi-step mashing activates different enzymes at specific temperatures. A protein rest at 50-55C breaks down large proteins, beta-amylase works best at 60-67C for fermentable sugars, and alpha-amylase at 68-72C produces more body. Single infusion at 65-68C works for most well-modified malts.

What are common step mash temperatures?

Acid rest: 35-45C (lowers pH). Protein rest: 50-55C. Beta-amylase: 60-67C (fermentable, dry beer). Alpha-amylase: 68-72C (body, mouthfeel). Mash-out: 76-78C (stops enzyme activity).

How do I raise the mash temperature between steps?

Three methods: infusion (adding boiling or near-boiling water), decoction (removing and boiling part of the mash), or direct heat (applying heat to the mash tun). Infusion is simplest for homebrewers.

Do I need a multi-step mash for modern malts?

Most modern pale malts are well-modified and do fine with a single infusion at 65-68C. Multi-step mashing is beneficial for under-modified malts, wheat beers, decoction-style lagers, and when using large amounts of adjuncts.

BrewCalcs

Mash Step Scheduler

Plan multi-step mash timing with infusion water temperatures.

Grain Bill Weight

Total weight of all grains

Water-to-Grain Ratio

Typical: 2.5-3.0 L/kg

Number of Steps

Step 1 Temperature (Protein Rest)

Step 1 Duration

Step 2 Temperature (Saccharification)

Step 2 Duration

How We Calculate This

Infusion Temperature

Strike Temp = (Thermal Mass Factor / Water Ratio) x (Target - Grain Temp) + Target. Subsequent steps use the current mash temperature, accounting for heat loss over the step duration, to calculate the infusion water temperature needed.

Conversion Efficiency

Estimated from time spent in the saccharification range (60-72C). Longer rests at these temperatures improve conversion.

Frequently Asked Questions

Last updated: 2026-03-01

All calculations are estimates. Always verify values and adjust based on your equipment and ingredients.