Unit Price Calculator

Retail Economics & NIST Unit Pricing Standards

The National Institute of Standards and Technology (NIST Handbook 130) establishes retail unit pricing guidelines requiring standardized price per measure (oz, lb, gram, fl oz, or count).

Primary Unit Price Formulas

• Unit Price (UP): UP = Package PricePackage Quantity

• Unit Price Difference: Δ UP = |UP_A - UP_B|

• Percentage Cost Savings: Savings \% = (Δ UP) / ((UP_A, UP_B)) × 100\%

• Equivalent Dollar Savings: Dollar Savings = Δ UP × Q_B

How to Use This Calculator

Enter your Item A Price () (e.g. 4.99 in ), Item A Quantity / Size (e.g. 16), Item A Unit — choose from Ounces (oz), Pounds (lb), Grams (g), Item B Price () (e.g. 8.49 in ), Item B Quantity / Size (e.g. 32), and Item B Unit — choose from Ounces (oz), Pounds (lb), Grams (g). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Conversion factors (to SI base unit or reference unit):

oz: 1

lb: 16

kg: 35.274

fl_oz: 1

gal: 128

liter: 33.814

count: 1

Worked Example

Buying a 32 oz jar of sauce for 8.49 saves 14.9% compared to buying two 16 oz jars at 4.99 each, putting 1.49 back in your wallet.

Understanding Your Result

Unit conversions are exact by definition within a given measurement system (e.g., 1 km = exactly 1,000 m). Cross-system conversions (metric to imperial) use defined exchange factors: 1 inch = exactly 2.54 cm; 1 pound = 0.45359237 kg. Round your converted result to match the precision of your original measurement — expressing more decimal places than your input justifies implies false accuracy. For regulatory, legal, or safety-critical applications, verify which measurement system is required by the applicable standard.