What standard costing is
Standard costing sets an expected cost for a product, component, or a full bill of materials in advance, based on planned material prices, labor rates, and overhead allocation, rather than waiting to see what a specific batch actually cost to produce or purchase.
That standard is then used for pricing, budgeting, and margin estimates throughout the period, and compared against actual costs as they come in. The gap between the two is the variance, and it is tracked deliberately rather than treated as noise.
This is common in manufacturing specifically because a BOM-based product has many cost inputs (multiple raw materials, labor, overhead), each of which can fluctuate independently — standard costing gives a single stable number to build a price or a budget around, instead of recalculating cost for every quote from whatever the most recent purchase happened to cost.
How cost variance works, with an example
Price variance is the difference between the standard price and the actual price paid per unit, multiplied by the quantity purchased. If a component has a $10 standard cost but was actually purchased at $11, and 100 units were bought, the price variance is (10 − 11) × 100 = −$100 (unfavorable, since actual cost more).
Quantity (or usage) variance is the difference between the standard quantity expected to produce a given output and the actual quantity used, valued at the standard cost. If a build was expected to use 5kg of material per unit but actually used 5.5kg, and the standard cost is $4/kg, across 100 units built that is (5 − 5.5) × 100 × $4 = −$200 unfavorable.
Both variances get reviewed periodically, and persistent unfavorable variance in either direction is the signal to update the standard, because it means the assumption behind it (the planned price, or the planned material usage) no longer reflects reality.
Standard costing vs. actual and weighted-average costing
Actual costing values each unit at the real cost of the specific purchase or build that produced it, which is the most accurate at any given moment but the hardest to use for forward-looking pricing, since the cost of the next unit is not known until it is actually produced or bought.
Weighted-average costing blends all actual costs into a single running average that updates with every purchase, giving a middle ground: more current than a static standard, but still a real, transaction-based number rather than a planning assumption.
Standard costing trades currency for stability: the number is set and held for a period, deliberately not chasing every purchase price fluctuation, which makes budgeting and pricing predictable at the cost of needing a periodic review to keep the standard from drifting too far from reality.
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