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Mixed fuel purchase cost calculator

Find the combined bill and weighted price of two fuel purchases.

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Your result

Total volume60L
Total fuel cost101
Weighted price per litre1.68

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How to calculate

Mixed fuel purchase costMixed fuel purchase costMixed fuel purchase costWeight each price by its purchased litres. A simple average of prices is correct only when both volumes are equal. Concept diagram; not to scale.Mixed fuel purchase costFirst purchasevolume (L)25First price perlitre1.8Total volume60 LMyCalCute.comFirst purchase volume (L)25First price per litre1.8Total volume60 L
Mixed fuel purchase costWeight each price by its purchased litres. A simple average of prices is correct only when both volumes are equal. Concept diagram; not to scale.Mixed fuel purchase costFirst purchasevolume (L)25First price perlitre1.8Total volume60 LMyCalCute.com
Weight each price by its purchased litres. A simple average of prices is correct only when both volumes are equal. Concept diagram; not to scale.

Find the combined bill and weighted price of two fuel purchases.

Total volume = litresA+litresB L
Total fuel cost = litresA*priceA+litresB*priceB
Weighted price per litre = (litresA*priceA+litresB*priceB)/(litresA+litresB)

Worked example

  • First purchase volume (L): 25
  • First price per litre: 1.8
  • Second purchase volume (L): 35
  • Second price per litre: 1.6
  • Total volume: 60 L
  • Total fuel cost: 101
  • Weighted price per litre: 1.68

Assumptions and limits

Only price and volume are combined. This does not assess fuel compatibility, octane blending, additives or safe vehicle operation. Use one currency.

Results are rounded for display; calculations use unrounded values. Read our calculation methodology.

Understanding the result

Find the combined bill and weighted price of two fuel purchases. Weight each price by its purchased litres. A simple average of prices is correct only when both volumes are equal.

When this tool is useful

Weight each price by its purchased litres. A simple average of prices is correct only when both volumes are equal.

Understanding your inputs

InputExample
First purchase volume (L) litresA25
First price per litre priceA1.8
Second purchase volume (L) litresB35
Second price per litre priceB1.6

Frequently asked questions

What does this estimate leave out?

Only price and volume are combined. This does not assess fuel compatibility, octane blending, additives or safe vehicle operation. Use one currency.

How do I check the example?

Use the stated units and the formula below. Keep full precision until the final answer; change one input at a time to see its effect.

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