Technology cluster
Electronics, Power & Device Calculators
Calculators for circuits, batteries, and everyday devices: resistor values, voltage drops, charge times, battery life, UPS runtime, and 3D printing costs for laptops, phones, drones, and robots.
Top calculators
A short starting set for the most common electronics, power & device calculators workflows.
USB-C Cable Voltage Drop Charge Time Calculator
Estimate voltage drop across a USB-C cable, the delivered power at your device, and how cable length and gauge affect real-world charge time.
Laptop Battery Life Estimator | Estimate Runtime from Capacity and Power Draw
Estimate laptop battery life from battery capacity in watt-hours, screen brightness, CPU load, and accessory power draw. Includes formulas, a worked example, assumptions, and an optional battery tuning mini-game.
UPS Runtime Calculator - Estimate Backup Battery Duration
Determine how long your uninterruptible power supply will run during an outage using battery capacity, load wattage, and inverter efficiency.
Cordless Power Tool Battery Charge Cost Calculator
Estimate the electricity used to charge cordless power tool batteries and calculate cost per charge, per week, and per year using voltage, amp-hours, charger efficiency, local electric rates, and charging frequency.
Battery Pack Configuration Calculator - Series and Parallel Planner
Determine the total voltage, capacity, and energy of a custom battery pack by entering cell specifications and series/parallel counts.
Router UPS Runtime Calculator | Estimate Wi‑Fi and Modem Backup Time
Estimate how long a router, modem, or fiber ONT can stay online on a UPS by entering battery watt-hours, networking load in watts, and UPS efficiency. See the formula, a worked example, practical caveats, and a load-shed mini-game.
Ham Radio Antenna Length Calculator - Calculate Dipole, Quarter-Wave, and Loop Antenna Dimensions
Calculate precise antenna lengths for amateur radio operations. Determine dipole, quarter-wave vertical, and loop antenna dimensions based on frequency, wire gauge, and antenna type. Perfect for ham radio operators and RF enthusiasts.
Laptop External Monitor Battery Drain Calculator
Estimate how connecting an external monitor affects your laptop's battery life and energy cost.
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3D Printer Filament Usage Estimator (Weight → Length, Cost & Spool Check)
Estimate 3D printer filament length from model weight using density, diameter, and waste %. Includes batch quantity, spool remaining check, and optional cost estimate.
3D Printing Carbon Footprint Calculator for Filament and Power
Estimate a 3D print's carbon footprint by combining filament production emissions with printer electricity use, then compare materials, print time, and grid intensity.
3D Printing Time Estimator - Estimate FDM Print Duration
Estimate 3D print time from filament length, average print speed, travel overhead, infill, and support percentage. Use this 3D printing time estimator to compare settings, preview finish time, and plan FDM jobs.
Battery Internal Resistance Calculator
Estimate internal resistance of a battery using open-circuit voltage, load voltage, and load current.
Battery Life Calculator - Estimate Device Runtime
Predict how long your phone, laptop, or other gadget will run on a single charge using battery capacity and power consumption.
Battery Pack Configuration Calculator - Series and Parallel Planner
Determine the total voltage, capacity, and energy of a custom battery pack by entering cell specifications and series/parallel counts.
Buck Converter Calculator - Duty Cycle and Ripple
Estimate duty cycle and inductor ripple current for a basic step-down switching regulator.
Capacitive Reactance Calculator | Xc = 1/(2πfC)
Calculate capacitive reactance from capacitance and frequency, estimate AC current for an applied voltage, and learn how Xc changes in practical circuits.
Circuit Breaker Panel Load Calculator (Watts to Amps) | Estimate Main Breaker Usage
Estimate electrical panel load in amps from total watts and voltage, then compare it to your main breaker rating. Includes formulas, practical planning guidance, assumptions, examples, and an optional mini-game.
Coaxial Cable Impedance Calculator
Determine the characteristic impedance of a coaxial transmission line from its conductor diameters and dielectric constant.
Cordless Power Tool Battery Charge Cost Calculator
Estimate the electricity used to charge cordless power tool batteries and calculate cost per charge, per week, and per year using voltage, amp-hours, charger efficiency, local electric rates, and charging frequency.
CPU Power Consumption & Battery Life Calculator | Laptop Runtime Estimator
Estimate laptop battery runtime from CPU TDP, CPU load, GPU power, other component draw, display brightness, system efficiency, and optional undervolting. Includes a downloadable report and an educational mini-game.
CPU Undervolting Battery Savings Calculator
Estimate how much extra laptop battery life you can get from CPU undervolting. Enter battery capacity (Wh), baseline runtime, CPU load power (W), undervolt r...
Drone Rental vs Purchase Cost Calculator | Break-Even Cost Comparison
Compare the cost of renting versus buying a drone, estimate total ownership and rental costs, and find the break-even days of use per year.
EV Battery Degradation & Warranty Calculator
Calculate electric vehicle battery degradation over time and model warranty coverage. Estimate battery capacity retention, replacement costs, and warranty claim eligibility based on age and mileage.
EV Battery Swap vs Fast Charging Cost Calculator
Estimate cost and time differences between swapping an EV battery and using a fast charger.
Fiber Optic Link Budget Calculator - Plan Reliable Networks
Compute the expected optical power at the receiver based on cable length, splices, and component losses.
Ham Radio Antenna Length Calculator - Calculate Dipole, Quarter-Wave, and Loop Antenna Dimensions
Calculate precise antenna lengths for amateur radio operations. Determine dipole, quarter-wave vertical, and loop antenna dimensions based on frequency, wire gauge, and antenna type. Perfect for ham radio operators and RF enthusiasts.
Homelab Server Electricity Cost Calculator – Monthly & Yearly Power...
Estimate the monthly and yearly electricity cost of running your homelab or home servers. Enter server count, wattage, uptime, and your $/kWh rate to see ene...
Laptop Battery Life Estimator | Estimate Runtime from Capacity and Power Draw
Estimate laptop battery life from battery capacity in watt-hours, screen brightness, CPU load, and accessory power draw. Includes formulas, a worked example, assumptions, and an optional battery tuning mini-game.
Laptop Battery Replacement vs New Laptop Cost Calculator
Compare the annualized cost of replacing a worn laptop battery with buying a new laptop. Enter repair cost, labor, years gained, new laptop price, and expected lifespan.
Laptop External Monitor Battery Drain Calculator
Estimate how connecting an external monitor affects your laptop's battery life and energy cost.
Laptop Sleep vs Shutdown Energy Cost Calculator
Estimate and compare your laptop’s yearly electricity cost in sleep vs full shutdown, with clear formulas, examples, and typical wattage assumptions.
LED Strip Power Supply Calculator | Wattage and Amperage Sizing
Calculate the right LED strip power supply size from strip length, watts per meter, and voltage. Get a practical wattage and current recommendation with built-in headroom.
Router UPS Runtime Calculator | Estimate Wi‑Fi and Modem Backup Time
Estimate how long a router, modem, or fiber ONT can stay online on a UPS by entering battery watt-hours, networking load in watts, and UPS efficiency. See the formula, a worked example, practical caveats, and a load-shed mini-game.
Smartphone Battery Replacement vs New Phone Cost Calculator
Use this smartphone battery replacement vs new phone cost calculator to compare monthly ownership cost, understand the formula in MathML, and decide whether a battery swap or a new phone is the better value.
Transformer Turns Ratio Calculator - Predict Secondary Voltage
Calculate the secondary voltage of an ideal transformer from the number of turns on each coil and the primary voltage. Learn how electromagnetic induction links turns ratio to voltage ratio.
Underground Cable Burial Depth Calculator (NEC Planning Guidance)
Estimate minimum underground cable burial depth (cover) for electrical, fiber, and data runs based on cable type, protection method (direct burial or conduit), location/traffic, soil conditions, and NEC Article 300.5 planning notes.
UPS Runtime Calculator - Estimate Backup Battery Duration
Determine how long your uninterruptible power supply will run during an outage using battery capacity, load wattage, and inverter efficiency.
USB-C Cable Voltage Drop Charge Time Calculator
Estimate voltage drop across a USB-C cable, the delivered power at your device, and how cable length and gauge affect real-world charge time.
VR Headset Refresh Rate Battery Life Calculator | Estimate Runtime, Power, and Charging Cost
Use this VR headset refresh rate battery life calculator to estimate power draw, battery runtime, and charging cost based on battery capacity, refresh rate, brightness factor, and electricity price.