Gadget Replacement Calculator
javascript
dev.to
“Should I replace this device?” sounds like a price comparison, but a cheap upgrade can still be a poor decision if the current device is inexpensive to keep or the new device carries a large manufacturing footprint. I built this calculator for a more explicit comparison: put the financial break-even point beside a rough carbon payback point, then see whether both axes agree. The result is not a universal upgrade rule. It is a transparent model whose assumptions you can change: device type, res