Energy, Nutrient, Percentage and Cost Calculations
Selecting data, scaling quantities and showing units and method for energy, nutrient, percentage, portion and cost problems.
How to prepare for the written examination
Move from person or food context to relevant evidence, scientific or nutritional principle, consequence and justified decision. Complete all practical and NEA work only through authorised centre arrangements.
Core concepts
Concept 1
A food calculation must establish the basis of the data, such as per 100 g, per portion, whole recipe or daily total.
Exam cue: Write basis, formula or scaling factor, substitution, answer and unit.
Concept 2
Scaling uses a consistent factor across quantity, energy, nutrient or cost while unit conversion must occur at a controlled stage.
Exam cue: Convert grams, kilograms, milligrams and micrograms before combining unlike units.
Concept 3
A calculated value becomes useful only when interpreted against the stated person, target, reference or comparison.
Exam cue: State what the final percentage or total means in the food context.
Risk pitfalls and guardrails
Using a per-100 g value as if it were the actual portion.
Guardrail: Do not replace explanation with a memorised food fact, undated public-health figure or a practical project that belongs to NEA.
Rounding too early and carrying error through several stages.
Guardrail: Do not replace explanation with a memorised food fact, undated public-health figure or a practical project that belongs to NEA.
Giving a mathematically correct number with no unit or nutritional interpretation.
Guardrail: Do not replace explanation with a memorised food fact, undated public-health figure or a practical project that belongs to NEA.
Memory anchors
Data Basis
The quantity or serving to which a stated energy, nutrient or cost value applies.
Scaling Factor
The multiplier that converts a reference quantity into the required quantity.
Percentage Contribution
A part expressed as a proportion of a stated total or reference value.
Unit Conversion
Changing measurement units without changing the underlying quantity.
Calculate-Then-Interpret
Show the method and unit, then explain the result in the stated food or nutrition context.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A bread recipe uses 500 g flour costing £1.60 per kilogram. What is the flour cost?
A 750 g bag of rice costs £2.25. What is the cost per 100 g?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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