To convert litres of peanut butter into kilograms, multiply by 1.0905022: one litre comes to 1.0905022 kilograms. Every ingredient has its own figure here, because the units are measuring different things and only the density links them.
Water is the yardstick: 1 mL of it weighs 1 g. Peanut butter comes in at 1.0905 g per mL, or 109.1% of water, which is why a cup of it is 258 g rather than 236.6 g. Volume and weight only line up for water, and only in metric.
A litre of peanut butter weighs 1.0905 kg, because its density is 1.0905 kg per litre. Litres and kilograms are the units this ingredient is actually bought in at any scale beyond a single recipe, which is what makes this the useful conversion for batch cooking and for costing.
A kilogram of peanut butter is 3.876 cups, and a 500 g pack is 1.938 cups. Metric pack sizes are round numbers in weight and awkward ones in volume, which is the practical argument for scaling a recipe by weight: 1.938 cups is a measurement you have to count out, 500 g is one you read off.
The condition this weight assumes: Smooth, at room temperature. Straight from the fridge it is far harder to level into a cup, and that shows up on the scale.
The formula
litres- The amount of peanut butter you are converting, in litres
1.09050223213- Kilograms per litre for peanut butter, from its density of 1.0905 g/mL
kilograms- The equivalent quantity in kilograms
How it works, step by step
- Enter the quantity in litres.
- It is multiplied by 1.09050223213, the kilograms-per-litre figure for peanut butter.
- The result appears in kilograms, with a second reading in lb beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
1/2 L of peanut butter in kilograms
A recipe calling for 1/2 L of peanut butter needs 0.545251 kilograms on the scale. The arithmetic is 0.5 × 1.0905022 = 0.54525112, and halving the recipe halves the weight to 0.272626 kilograms.
1 L of peanut butter in kilograms
Take 1 L of peanut butter: 1 × 1.0905022 gives 1.0905 kilograms. Doubling the batch takes it to 2.181 kilograms, because the relationship is a straight proportion once the density is known.
2 L of peanut butter in kilograms
A recipe calling for 2 L of peanut butter needs 2.181 kilograms on the scale. The arithmetic is 2 × 1.0905022 = 2.1810045, and halving the recipe halves the weight to 1.0905 kilograms.
How to read your score
Frequently asked questions
How many kilograms are in 1 L of peanut butter?
One litre of peanut butter is 1.0905022 kilograms. Half that quantity is 0.545251 kilograms and double it is 2.181 kilograms, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of peanut butter not 236 g like water?
Because weight per cup depends on what is in the cup. Peanut butter has a density of 1.0905 g per mL where water has 1.00, so a cup of it weighs 258 g rather than 236.6 g. That is a difference of 21.4 g per cup, and it is the reason a single volume-to-weight factor cannot be applied to every ingredient.
Does how I measure it change the weight?
Barely. Peanut butter does not compress, so a cup of it is 258 g however it is poured — within about 1%, which is inside the accuracy of a domestic scale. This is the group where measuring by volume is defensible.
Is a fluid ounce of peanut butter the same as an ounce?
No. A fluid ounce is a volume — one eighth of a US cup, 29.57 mL — and an ounce is a weight. One fluid ounce of peanut butter weighs 1.138 oz, so the two readings differ by 13.8%. They coincide only for something with the density of water, and then only roughly.
Is this a US cup or a metric cup?
US customary: 236.59 mL, which is the cup every US recipe means. A metric cup is 250 mL, so the same cup of peanut butter would weigh 272.63 g instead of 258 g — 14.6 g more, or 5.67%. Australian and some European recipes use the metric cup, and the difference is large enough to matter in baking.
Do I need a scale for this, or will measuring cups do?
A scale, if the result matters. Volume measuring carries a spread of about 1% for peanut butter — roughly 2.58 g on a 258 g cup — while a domestic scale is accurate to a gram or two. For anything where the ratio of ingredients drives the outcome, bread and pastry above all, weigh it.
How many litres of peanut butter is 1 kg?
1 kg of peanut butter is 0.91701 litres — 0.917009 litres to one kilogram, so 1 × 0.917009 = 0.91701. Going that way is a division by 1.0905, or a multiplication by 0.917009 if you prefer.
Peanut butter in litres and kilograms
| Litres | Kilograms | Unrounded |
|---|---|---|
| 0.1 L | 0.10905 kg | 0.1090502232 |
| 1/4 L | 0.272626 kg | 0.272625558 |
| 1/2 L | 0.545251 kg | 0.5452511161 |
| 3/4 L | 0.817877 kg | 0.8178766741 |
| 1 L | 1.0905 kg | 1.090502232 |
| 1 1/2 L | 1.63575 kg | 1.635753348 |
| 2 L | 2.181 kg | 2.181004464 |
| 3 L | 3.27151 kg | 3.271506696 |
Based on 258 g per cup of peanut butter. One litre of peanut butter is 1.0905022 kilograms.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 258 g | 9.1 oz | 236.6 mL |
| 3/4 cup | 193.5 g | 6.83 oz | 177.4 mL |
| 2/3 cup | 172 g | 6.07 oz | 157.7 mL |
| 1/2 cup | 129 g | 4.55 oz | 118.3 mL |
| 1/3 cup | 86 g | 3.03 oz | 78.86 mL |
| 1/4 cup | 64.5 g | 2.28 oz | 59.15 mL |
| 1 tbsp | 16.12 g | 0.569 oz | 14.79 mL |
| 1 tsp | 5.375 g | 0.19 oz | 4.929 mL |
US customary measures: 1 cup = 236.59 mL, 1 tbsp = 14.79 mL, 1 tsp = 4.93 mL.
| Ingredient | Grams per cup | Ounces per cup | Density (g/mL) |
|---|---|---|---|
| Tomato sauce | 245 g | 8.642 oz | 1.036 |
| Orange juice | 248 g | 8.748 oz | 1.048 |
| Evaporated milk | 252 g | 8.889 oz | 1.065 |
| Peanut butter (this page) | 258 g | 9.101 oz | 1.091 |
| Sweetened condensed milk | 306 g | 10.79 oz | 1.293 |
| Maple syrup | 322 g | 11.36 oz | 1.361 |
| Corn syrup | 328 g | 11.57 oz | 1.386 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.