LDK to PPG Conversion Calculatorv1.0.0

This calculator converts between Litre Degrees per Kilogram (LDK) and Points per Pound per Gallon (PPG), two systems used by brewers and malt suppliers to express the extract potential of malted grains. LDK is the standard in the United Kingdom and many European malt specification sheets, while PPG is the standard in the United States and is used by most online brewing calculators and recipe databases. The conversion factor is derived from the relationship between kilograms and pounds and between litres and US gallons.

The formula used is: PPG = LDK / 8.3454, where 8.3454 is the product of the pound-to-kilogram ratio (2.20462) and the US-gallon-to-litre ratio (3.78541). The reverse formula is: LDK = PPG x 8.3454. Note that US gallons are used, not Imperial gallons.

• Enter a value in the Litre Degrees Per Kilogram (LDK) field to convert to PPG, or enter a value in the Points Per Pound Per Gallon (PPG) field to convert to LDK.
• The calculator accepts decimals (300.5), fractions (3/4), and mixed numbers (36 1/2).
• Results update automatically after a short delay, or press the Convert button to trigger the conversion manually.
• Open the Settings panel to adjust the number of decimal places displayed in the result or to enable step-by-step formula derivation.
• Press the Reset button to clear all inputs and restore default settings.
• Bookmark or share a specific conversion by copying the URL from the address bar after performing a calculation.

Malt extract potential values are essential for predicting original gravity and building accurate brewing recipes. Because malt suppliers in different regions publish specifications in different unit systems, a reliable conversion tool bridges the gap between recipe software expectations and malt data sheets. Homebrewers, professional brewers, and malt suppliers all benefit from fast and accurate conversions between these two standards.

• Homebrewing recipe design: Convert LDK values from a UK malt data sheet into PPG so they can be entered into US-based recipe calculators such as those built around PPG-based gravity prediction formulas. For example, convert a pale malt specification of 305 LDK to approximately 36.55 PPG for use in a recipe targeting 1.050 original gravity.
• Professional brewing: Translate PPG values from American hop and grain databases into LDK for use in metric-based brewhouse software or production spreadsheets. Production brewers working across international supply chains rely on consistent unit conversion to maintain batch consistency.
• Malt supplier comparison: Normalize extract potential values from suppliers across different countries to compare grain quality on a common scale regardless of the unit system published. Compare a German pilsner malt at 310 LDK against an American two-row at 37 PPG by converting both to the same system.
• Educational reference: Verify textbook conversion examples or learn how the relationship between kilograms, pounds, litres, and US gallons produces the 8.3454 conversion factor. Enable the step-by-step derivation in settings to see the full breakdown of each calculation.
• Recipe scaling across systems: Adapt a recipe originally formulated in one unit system for use in another, ensuring grain bill calculations produce the intended original gravity. Share specific conversions with brewing partners by copying the URL from the address bar after performing a calculation.
• Quality control documentation: Record malt lot specifications in both LDK and PPG formats for internal records that serve teams working in different measurement traditions. Maintain consistent documentation across brewery locations in different countries.