Unit Price Comparison Calculator

Find the cheapest fertilizer, mulch, or soil option. Normalize prices per liter, kilogram, or piece. Adjust for discounts and compare up to five items.

Calculator Inputs

Compare up to five products across a single measurement category.
White theme Gardening focus
Use one category for fair comparisons.
Shown in the results table.
Example: USD, EUR, GBP, PKR.
More decimals help close comparisons.

Items

Fields: price, size, unit, discount, coupon, tax, shipping, waste, dilution.
Percent off the base price.
Flat amount off the price.
Spillage, unusable parts, trimming loss.
Concentrates: final usable units per purchased unit.
Percent off the base price.
Flat amount off the price.
Spillage, unusable parts, trimming loss.
Concentrates: final usable units per purchased unit.
Percent off the base price.
Flat amount off the price.
Spillage, unusable parts, trimming loss.
Concentrates: final usable units per purchased unit.
Percent off the base price.
Flat amount off the price.
Spillage, unusable parts, trimming loss.
Concentrates: final usable units per purchased unit.
Percent off the base price.
Flat amount off the price.
Spillage, unusable parts, trimming loss.
Concentrates: final usable units per purchased unit.
Reset

Example Data Table

Item Price Size Discount Waste Dilution
Organic fertilizer (granular) USD 18.99 4 kg 5% 2% 1.00
Liquid concentrate feed USD 14.50 1 L 0% 0% 25.00
Seed packets USD 3.99 1 dozen 10% 0% 1.00
These examples show how waste and dilution affect the effective unit cost.

Formula Used

  • Base quantity = Quantity × Unit conversion factor
  • Effective quantity = Base quantity × Dilution × (1 − Waste%/100)
  • Net price = ((Price × (1 − Discount%/100) − Coupon) + Shipping) × (1 + Tax%/100)
  • Unit price (base) = Net price ÷ Effective quantity
  • Unit price (compare unit) = Unit price (base) × (Base units per comparison unit)
If you are comparing liquids, use the Volume category. For bulk items, use Weight. For landscape fabric, use Area.

How to Use This Calculator

  1. Select a measurement category that fits all items.
  2. Choose the unit you want to compare per.
  3. Enter each item’s price and package size.
  4. Add discount, coupon, shipping, and tax if needed.
  5. Set waste for expected loss or leftovers.
  6. Use dilution for concentrates that make more volume.
  7. Press Compare Unit Prices to rank the options.
  8. Download CSV or PDF to save your comparison.
Tip: Keep categories consistent for accurate rankings.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.