Jack's — “How long did this cost me?” Calculator (GBP)

Enter your income + expenses + savings rate, then add items. It shows work time, calendar time, and opportunity cost. Data stays on your device (localStorage).

£ GBP Works offline after first load Add to Home Screen

1) Your money settings

Net pay method

Net annual pay (£)

Work hours per week

Work days per week

Hours per work day (for “days”)

How much of net pay can you save? (%)

2) Recurring expenses (optional, but makes it “full match”)

Add monthly fixed costs (rent, bills, subscriptions). This reduces what’s left to save.

3) Add an item

Item name

Price (£)

Your dashboard

Sort

Filter category

Item	Price	Work time	Calendar time (saving)	Cost rating	Action

Opportunity cost (quick comparisons)

This converts an item into “how many of your common monthly costs” it equals. Add your recurring expenses on the left to make this useful.