Unit price calculator
Unit price calculator: enter your values and get an instant free result.
Open calculatorCleverCalc · Guides
Compare offers: unit prices and successive discounts
A bigger pack or a larger discount is not automatically better value. Convert offers to the same unit, apply successive discounts correctly and compare the final amount payable, including relevant extra costs.
The right calculatorsHow to get started
- 01
Choose a common unit such as kg, litres or items. Compare comparable products; different quality, concentration or serving sizes can make unit prices misleading.
- 02
Divide price by quantity. Convert grams to kilograms by dividing by 1,000 first. Put both offers on the same basis before judging the saving.
- 03
Apply the second discount to the already reduced price. Check shipping, minimum purchase and coupon conditions; a saving only helps if you actually need the quantity.
The right calculators
Best-value comparison
Best-value comparison: enter your values and get an instant free result.
Open calculatorDiscount calculator
Calculate the final price after a discount.
Open calculatorStacked discount calculator
Stacked discount calculator: enter your values and get an instant free result.
Open calculatorA worked example
Compare offers: unit prices and successive discounts
Pack A: 2.5 kg for €7.50 = €3.00/kg. Pack B: 1.8 kg for €5.76 = €3.20/kg. A costs less per kg despite the higher total price. For a €100 item discounted first by 20% and then by 10%, pay 100 × 0.80 × 0.90 = €72: a total discount of 28%, not 30%.
Frequently asked questions
Why can’t I simply add two discounts?
The second percentage applies to the smaller remaining price. The combined factor is (1 − discount 1 ÷ 100) × (1 − discount 2 ÷ 100). Subtract that factor from 1 to get the total discount fraction.
When is a unit-price comparison not enough?
When concentration, usable quantity, shelf life or quality differ. For detergent, for example, cost per wash may tell you more than cost per litre.
More guides
Calculate appliance electricity costs: watts, kWh and annual cost
What does a lamp, PC or refrigerator cost to run each year? Separate power in watts from energy in kWh and use your own electricity tariff. Compare appliances over the same usage period rather than judging them by wattage alone.
Read guidePlan laminate and paint: floor area, waste and coats
Plan materials for a room in the right order. Floor area and wall area are different quantities. Calculate them separately, choose an appropriate allowance and round up when buying full packs or paint containers.
Read guideFinance calculators: interest, savings and loans
Match your money question to the right tool: percentages for shares, interest for a period, compound interest for multiple years and loan payments for regular instalments. Compare scenarios using the same assumptions.
Read guideCalculate household costs: electricity, appliances and budget
Put monthly and annual household costs on the same basis. Calculate appliance usage, electricity costs and subscriptions before adding the amounts to your household budget.
Read guideBuilding and renovation: calculate area and materials
Start with area, then calculate material quantities and costs. Find tools for laminate, tiles, paint, concrete and building costs, including a waste allowance you choose yourself.
Read guideSports calculators: running pace, swim pace and steps
Compare time, distance and pace with sports calculators. Convert steps into kilometres or use health tools for general information. Check the units and the assumptions of each model.
Read guideConvert units: length, weight, volume and temperature
Find the right converter for international units. Distinguish length, weight, volume and temperature, and remember that some kitchen measures depend on the measurement system or ingredient.
Read guidePlan a travel budget: costs per day and person
Plan accommodation, transport and day-to-day travel costs together. Split expenses per person, calculate a daily budget and keep currency conversion separate from possible bank charges.
Read guide