How does Coday work out cost per day, cost per use and cost per unit?

Cost per day = (price + additional costs − money from selling it) ÷ days in use. The day you buy it counts as day 1 and paused days are left out, so a $999 phone used for two years comes to about $1.37 a day. Things you use now and then get a cost per use, consumables a cost per unit, and subscriptions a daily cost from the current charge.

Cost per day: what something you own costs each day

When you add an item, leave Pricing on "Per day" (the default). Coday spreads the item's net cost over every day it's been in use:

Cost per day = (price + additional costs − money from selling it) ÷ days in use

The longer you use it, the lower it goes. The item's page shows how much one more day takes off.

Additional costs and recurring costs count too

A thing costs more than its price:

• Additional costs: one-off spending like accessories, repairs, fuel or vet visits. Log them on the item and they're spread over the days in use along with the price.
• Recurring costs: things paid each period, like car insurance or vaccines, are worked out per period: what you paid this period ÷ the days in it, added on to the cost per day.

Sold it: the money you got back comes off

Set the status to "Sold" and enter the price. The average then uses the net cost, and the day count stops on the day you sold it.

Say you sold that $999 phone for $400 after two years: (999 − 400) ÷ 730 ≈ $0.82 a day.

Paused days don't count

If you retire or sell something and later start using it again, the gap isn't counted as days in use:

1. When you stop using it: edit the item, set "Status" to "Retired" or "Sold" and enter the date.
2. When you use it again: set the status back to "In Use" and enter "Resumed On". If you were using it all along and just marked it by mistake, choose "Never Stopped Using" and the gap counts as normal.

Say the phone sat in a drawer for 65 of those two years: 999 ÷ (730 − 65) ≈ $1.50 a day.

Once something is retired, its average stays where it was on the day you retired it.

Cost per use: what each use costs

For a racket, a camera lens or a suit you only wear on big occasions, a daily figure doesn't mean much. Set Pricing to "Per use" and tap "Use once" on the item's page each time:

Cost per use = (price + additional costs − money from selling it) ÷ times used

A $150 racket played with 60 times: 150 ÷ 60 = $2.50 a use. Until you've used it once there's no cost per use, and the more you use it the lower it gets.

Cost per unit: what each one of a consumable costs

For tissues, coffee pods or cat litter, set Pricing to "Consumable" and log how many you bought, plus the amount and price of each restock:

Cost per unit = net cost ÷ total units bought (the first lot plus every restock)

Say you paid $12 for 12 rolls of paper towels and later $11 for another 12: (12 + 11) ÷ 24 ≈ $0.96 a roll.

Subscriptions: price per cycle, spread over the year

Subscriptions, memberships and annual passes are charged by period, so cost per day = price per cycle × cycles per year ÷ 365, the same in long and short months:

• $9.99 a month: 9.99 × 12 ÷ 365 ≈ $0.33 a day.
• $59.99 a year: 59.99 ÷ 365 ≈ $0.16 a day.

During a trial it's the trial price ÷ the trial days, so a free trial is 0. Once you unsubscribe, the average stays where it was on that day.