Calculator Input
Enter your grain bill, mash setup, boil plan, hop data, and target finishing gravity.
Example Data Table
This sample shows a common five gallon pale ale style batch.
| Input | Example Value | Purpose |
|---|---|---|
| Total Grain Weight | 10 lb | Defines fermentable material. |
| Average Grain Potential | 36 PPG | Estimates possible sugar yield. |
| Mash Efficiency | 75% | Adjusts gravity for system performance. |
| Final Batch Volume | 5 gal | Sets finished recipe size. |
| Pre-Boil Volume | 6.5 gal | Supports boil-off planning. |
| Hop Weight | 1 oz | Calculates estimated bitterness. |
Formula Used
Gravity points: (grain weight × PPG × efficiency) ÷ final volume
Original gravity: 1 + gravity points ÷ 1000
Pre-boil gravity: 1 + ((grain weight × PPG × efficiency) ÷ pre-boil volume) ÷ 1000
ABV: (original gravity - final gravity) × 131.25
Grain absorption: grain weight × absorption rate
Mash water: (grain weight × mash thickness) ÷ 4
Sparge water: pre-boil volume + absorption + trub loss - mash water
Strike water temperature: ((target mash temp - grain temp) × (0.2 ÷ mash ratio)) + target mash temp
SRM: 1.4922 × MCU ^ 0.6859
IBU estimate: (hop oz × alpha acid × utilization × 0.7489) ÷ batch volume
How to Use This Calculator
Start with your total grain bill. Enter its average potential in PPG. Add your expected mash efficiency. Use your real brewing system values when possible.
Next, enter your final batch size and pre-boil volume. Add boil time, evaporation rate, trub loss, and absorption rate. These fields estimate water demand and expected transfer volume.
Then enter mash thickness, grain temperature, and target mash temperature. The calculator estimates strike water temperature. This helps you hit the mash rest more closely.
Finally, add color, final gravity, and hop data. Submit the form. Results will appear above the form and below the header. Use the chart, CSV export, or PDF export for recipe records.
All Grain Brewing Guide
Plan the Whole Batch
All grain brewing needs careful planning. A small change can affect the whole recipe. Grain weight changes gravity. Water volume changes strength. Boil loss changes yield. This calculator brings those numbers together in one place.
Understand Gravity
Original gravity shows how much sugar is in the wort. It depends on grain potential, mash efficiency, and final volume. Higher grain weight raises gravity. Better efficiency also raises gravity. More final volume lowers gravity. Use realistic efficiency for better results.
Control Brewing Water
Water planning is very important. Grain absorbs liquid during the mash. The kettle loses water during the boil. Some wort stays behind with trub. The calculator estimates mash water, sparge water, total water, post-boil volume, and fermentor volume. These numbers help reduce missed batch sizes.
Hit the Mash Temperature
Strike water must be hotter than the target mash temperature. Dry grain cools the water when mixed. The calculator uses grain temperature and mash thickness to estimate strike water temperature. This helps create a stable mash rest.
Estimate Strength and Balance
ABV is estimated from original gravity and final gravity. Bitterness is estimated from hop weight, alpha acid, utilization, and batch size. Color is estimated from malt color and grain amount. These results help balance the recipe before brew day.
Improve Future Recipes
Save your results after each brew. Compare planned gravity with measured gravity. Compare planned volume with collected volume. Update efficiency, evaporation, and loss values over time. Your future recipes will become more accurate with each batch.
FAQs
1. What is all grain brewing?
All grain brewing makes wort from crushed malted grain. The mash converts starch into fermentable sugar. It gives more control over flavor, body, color, and recipe design than extract brewing.
2. What does PPG mean?
PPG means points per pound per gallon. It shows the potential sugar contribution from one pound of grain in one gallon of wort under ideal conditions.
3. Why does mash efficiency matter?
Mash efficiency shows how much potential sugar your system collects. Higher efficiency gives more gravity from the same grain bill. Lower efficiency may require more grain.
4. What is strike water temperature?
Strike water temperature is the hot water temperature before grain is added. It must be higher than the target mash temperature because dry grain cools the mixture.
5. Why calculate sparge water?
Sparge water rinses sugars from the grain bed. Correct sparge volume helps reach the planned pre-boil volume without making the wort too weak.
6. Is the IBU result exact?
No. IBU is an estimate. Real bitterness depends on boil vigor, hop age, wort gravity, timing, utilization method, and lab measurement differences.
7. What causes missed final volume?
Common causes include wrong boil-off rate, inaccurate kettle markings, high grain absorption, transfer loss, dead space, and trub left behind after chilling.
8. Can I use this for recipe design?
Yes. Use it to estimate gravity, water, color, bitterness, and strength. Then compare the results with your style target and measured brew day data.