What does it cost to leave it on?
Turn watts and your electricity rate into a daily, monthly, and yearly cost.
Free tools for everyday technology
Run the numbers.
Make a better call.
What does that always-on device cost? Is an upgrade worth it? Will your backup finish this week? Start with your numbers.
Will a more efficient device pay for itself?
Compare energy savings with the purchase price before replacing working equipment.
How long will your upload actually take?
Account for your upload speed, usable bandwidth, and the hours available each day.
Your inputs. Visible assumptions. No signup.
Calculations happen in your browser. Copy a result link or print the page to keep your comparison.
Understand the decision behind the number.
The cost of an always-on device
Why a few watts add up, how to measure them, and which rate to use.
Should you replace an old PC to save electricity?
Work through purchase cost, annual savings, and the limits of a payback calculation.
How long does a 1 TB backup take?
See the effect of upload speed, overhead, and overnight-only schedules.
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