4 free calculators to help you choose, install, and optimize your smart lock
Choosing a smart door lock involves more than just upfront price. Our free calculators help you understand ongoing costs (batteries, subscriptions), compatibility with your smart home, security features you need, and total cost of ownership over 5 years.
Whether you're upgrading to your first smart lock, replacing an existing one, or comparing multiple options, these tools will save you time, money, and help you avoid buyer's remorse.
Calculate annual battery replacement cost based on lock type, usage frequency, and battery brand
Compare DIY vs professional installation costs for retrofit and full replacement locks
Calculate 5-year total cost of ownership including lock, installation, batteries, and subscription
Calculate features per dollar value to find the best bang for your buck (UNIQUE metric!)
Start with the Battery Life Calculator to understand ongoing costs, then use the Total Cost Calculator to see the complete 5-year picture.
Use the Total Cost Calculator to understand 5-year ownership costs, then find the best value with the Features per Dollar Calculator.
Use the Installation Cost Calculator to compare DIY vs professional installation costs and decide which option makes sense for your situation.
Our calculators use industry-standard battery costs, typical installation rates, and real product data from 2,500+ smart locks. Results are highly accurate for planning purposes, but always check your specific lock's specifications for exact values.
If you're just starting research, use the Battery Life Calculator to understand ongoing costs. If you want to see the complete picture including installation and maintenance, use the Total Cost Calculator to plan your 5-year budget.
No, use only what you need! Most people use 2-3 calculators depending on their priorities. The Total Cost Calculator and Features per Dollar Calculator are most commonly used when narrowing down final choices.
This is our exclusive metric that NO competitor offers! It calculates how many features you get per $100 spent, helping you find locks that offer the most value for your money regardless of price point.