Cost per Day Calculator

500 jacket worn 2 days a week for 5 years = 520 uses = 96p per use. Or 500/1825 days = 0.27/day. Reframes big purchases. Helps judge whether a 'worth it' premium applies. Works for any long-life purchase.

Run it with sensible defaults

Using purchase price of 500, expected years of use of 5, the calculation works out to 0.27. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Purchase Price and Expected Years of Use — do not pull with equal force.

How the math works

Price divided by days of use.

Using the result to negotiate

The figure gives you a concrete number to quote when shopping alternatives. "I'm paying X annually" cuts through marketing in a way "I want a better deal" doesn't. The specificity wins.

What this doesn't capture

Usage varies month-to-month; tariffs change; discounts come and go. The figure here is a clean baseline — your actual annual bill will fluctuate around it. Use the calculation to benchmark providers, not as a prediction of a specific bill.

Related calculations worth running

Plans get firmer when you triangulate. Alongside this one, the true cost of ownership calculator, the annual cost of habit calculator, and the coffee habit calculator tend to come up in the same conversations. Running two or three together exposes inconsistencies in any single assumption — which is usually where the useful insight lives.

Worked example

A professional bag costs 200 and is expected to last 4 years of regular daily use. The calculator divides 200 by 1,460 days (4 × 365), giving approximately 0.14 per day. Over a 5-day working week, that's roughly 0.70 per working day. Compared side-by-side with a cheaper bag at 80 that lasts 2 years (0.11 per day), the math shows the premium bag's daily cost in concrete terms, making the durability trade-off visible.

Common scenarios

• Comparing quality tiers of everyday items (shoes, bags, tools)
• Evaluating whether a premium version justifies higher upfront cost
• Framing one-time purchases in terms of recurring daily expense
• Understanding the true affordability of a long-life asset

What the result illustrates and what it does not

The calculator shows the average daily cost of a purchase spread evenly across its expected life. It does not account for maintenance costs, repair expenses, replacement parts, or inflation over time. It also assumes steady, consistent use — in reality, usage patterns vary. The result is an educational illustration of cost amortisation, useful for comparison but not a complete financial model.