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Unit price calculator

Compare products by working out the price per unit and per 100 units.

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The Unit price calculator turns Price, Quantity (g, ml, units…) into Price per unit, Price per 100, instantly and for free. For instance, with Price = $4.50 and Quantity (g, ml, units…) = 500 it returns Price per unit = $0.01 and Price per 100 = $0.90.

How to use it

  1. Enter your values: Price, Quantity (g, ml, units…).
  2. Read the result instantly: Price per unit, Price per 100.

Frequently asked questions

What does the Unit price calculator actually compute?

It takes Price and Quantity (g, ml, units…) and derives Price per unit and Price per 100 from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

2 values: Price ($) and Quantity (g, ml, units…). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Price = $4.50 and Quantity (g, ml, units…) = 500, the calculator returns Price per unit = $0.01 and Price per 100 = $0.90. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

When would I actually use this?

Deciding at the shelf: which pack is genuinely cheaper, what a stacked discount really leaves, and how a bill splits when it is not split evenly.

What is the most common mistake?

Adding stacked discounts together. Thirty per cent then a further twenty is not fifty off — it is forty-four, because the second is taken on what the first already reduced.

What is the difference between the Unit price calculator and the Coffee habit cost calculator?

This one returns Price per unit and Price per 100; the Coffee habit cost calculator returns Monthly cost and Yearly cost. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Cost per use calculator is the closest one after this: Work out the real cost per use of a purchase to judge if it's worth it.

What else is worth having open alongside it?

Discount calculator and Discount percentage finder — they come up in the same task often enough to be worth a second tab.

Where do the figures come from, and how current are they?

The arithmetic is exact for the prices you enter. Unit prices on shelf labels are legally standardised in the EU but rounded, so a computed figure can differ slightly from the printed one.

Further reading

All guides →
How-toHow to Compare Unit Prices and Find the Better DealTurn any package price into a price per pound or ounce so you can compare sizes and brands honestly, ignore the marketing, and spot the real bargain on the shelf.ComparisonWhich Pizza Size Is the Best Value? The Answer Is GeometryArea grows with the square of the diameter, so an 18-inch pizza is not half as big again as a 12-inch — it is more than twice. Price per square inch settles the argument; the crust and the toppings complicate it.How-toThe Perfect Coffee-to-Water Ratio (the Golden Ratio Explained)The golden ratio is roughly 1:16 — learn grams of coffee per cup and how to adjust strength to your taste.ExplainerWhat a Daily Coffee Habit Costs Over a YearThe number is large because it is a daily number multiplied by 260 or 365 — and the same arithmetic works on anything daily, which is the part worth keeping. With the home-brewing comparison done properly, and a plain statement of what the number is not.GuideWhat Your Subscriptions Really Cost in a YearThe addition is trivial. What people miss is the annual plan billed once, the trial that converted, the conversion fee on a service billed abroad — and the break-even month that decides whether a yearly plan was ever a saving.How-toHow to Calculate a Discount (and the Final Price)A discount is a percentage off a price. Here's how to find the amount saved and the final price — plus how to stack discounts and spot fake deals.