Digital devices have a real monthly cost, but the calculators on this site estimate it at two different scopes. The Screen Time Cost calculator models a single device with two ingredients: the electricity it draws and a usage-weighted share of its purchase price. The Digital Device Usage Cost calculator models an entire setup — up to 20 devices — adding maintenance and recurring device-related fees to electricity and depreciation. The genuine choice between them is scope: one device and a habit-focused estimate, or the whole home office, gaming, or family electronics list.
Both pages share the same electricity math — watts, hours, and rate over a 30-day month — and both are planning estimates rather than measurements. The real fork is how much of the ownership picture you want included.
What each calculator does
The Screen Time Cost Calculator takes a device cost, daily usage hours, electricity rate, lifespan in months, and a usage share, then reports a monthly and yearly total. Electricity is daily hours times kilowatts times a 30-day month times the rate; depreciation is device cost divided by lifespan months, scaled by the share of the day you actually use the device. Its worked example — a desktop at 100 watts, 4 hours a day, with a 50% usage share — comes to $2.40 in electricity plus $12.50 in depreciation, or $14.90 per month. The blue-light, break, and ergonomics switches on the page are context prompts only and do not change the arithmetic.
The Digital Device Usage Cost Calculator starts with an electricity rate and then takes one or more named devices, each with hours per day, watts, purchase price, lifespan in years, monthly fees, and yearly maintenance. Per device it adds power, depreciation (purchase price divided by lifespan in months), maintenance (yearly amount divided by 12), and fees, then sums every device into one monthly total. Its worked example totals about $59.00 per month for a laptop and a game console.
Side-by-side comparison
| Feature | Screen Time Cost Calculator | Digital Device Usage Cost Calculator |
|---|---|---|
| Scope | One device | Up to 20 devices |
| Cost ingredients | Electricity + usage-weighted depreciation | Electricity + depreciation + maintenance + monthly fees |
| Depreciation basis | Lifespan in months × usage share | Lifespan in years, no usage-share adjustment |
| Monthly fees | Not included | Included per device |
| Extra inputs | Usage share, behavior prompts | Maintenance, recurring fees, device names |
| Typical question | What does this device cost me while I use it? | What does my whole setup cost per month? |
When to use which
Use the Screen Time Cost Calculator when you are looking at one device and one habit — a phone, laptop, or TV — and want a quick electricity-plus-depreciation floor on its use. Its usage-share adjustment makes it a conservative usage cost rather than a full ownership budget. Use the Digital Device Usage Cost Calculator when you want the full monthly ownership picture: a home office, gaming setup, network equipment, or family devices, including maintenance and subscriptions, with per-device breakdowns that show which cost driver dominates.
Neither calculator prices attention, productivity, sleep, or health, and neither should be read as a complete answer to whether screen time is worth it. Both also depend on the values you enter — measured or labeled watts, realistic lifespans, and an electricity rate in dollars per kWh — so the estimate is only as good as the scenario, and neither measures standby power, time-of-use rates, resale value, or shared family use.
Where to start
- Screen Time Cost Calculator — one-device electricity and usage-weighted depreciation estimate.
- Digital Device Usage Cost Calculator — multi-device monthly cost with maintenance and fees.