All Calculators — My ROI Lab
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Every purchase has a payback period.
Find yours.

Honest, data-driven ROI calculators for real consumer decisions. Pick a category, enter your numbers, and see exactly what any purchase will cost — and return — over its full lifespan.

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12 calculators
🏠 Home 4 calculators
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Robot Vacuum
Time savings versus manual cleaning, calibrated to your hourly rate and weekly cleaning frequency.
530% ROIavg. 7.7 mo payback
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Smart Thermostat
Energy savings modeled to your climate zone, home size, and daily usage patterns.
180% ROIavg. 14 mo payback
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Water Filtration
Bottled water cost displacement versus filter replacement and upfront capital cost over time.
340% ROIavg. 8 mo payback
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Robot Lawn Mower
Lawn service savings versus equipment cost, modeled against your yard size and service frequency.
260% ROIavg. 22 mo payback
🚗 Transport 2 calculators
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Electric Vehicle vs Gas
5-year total cost of ownership across fuel, maintenance, insurance, and depreciation curves.
210% ROIavg. 3.2 yr payback
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Bike vs Car Commute
Fuel, parking, and maintenance savings from switching your commute to a bicycle over time.
400% ROIavg. 6 mo payback
💪 Health & Fitness 2 calculators
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Home Gym Equipment
Gym membership cost displacement versus equipment acquisition over your ownership horizon.
290% ROIavg. 18 mo payback
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Standing Desk
Productivity gains and health cost savings modeled against your hourly rate and usage habits.
180% ROIavg. 20 mo payback
⚡ Energy 2 calculators
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Solar Panels
Energy yield versus utility cost, federal tax credits, and financing across a 25-year horizon.
380% ROIavg. 7.4 yr payback
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LED Lighting Upgrade
Electricity bill savings from switching your entire home to LED versus incandescent bulbs.
500% ROIavg. 4 mo payback
💻 Tech & Devices 2 calculators
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Repair vs Replace Laptop
Whether to repair your current device or buy new, modeled against age, repair cost, and performance needs.
Variesdepends on repair cost
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Home Espresso Machine
Cafe spending displacement versus machine cost, modeled against your daily coffee habit.
250% ROIavg. 5 mo payback
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