Common technology tasks
Relate width, height and a selected display ratio.
Open calculator Battery Runtime CalculatorEstimate runtime from stored energy and load.
Open calculator Screen PPI CalculatorRelate screen dimensions, resolution and pixel density.
Open calculator File Size CalculatorEstimate digital media size from rate, duration or dimensions.
Open calculatorHow to use these calculators
Technology specifications often mix nominal capacity with usable performance. A battery's watt-hours do not guarantee runtime, advertised storage is not the same as formatted capacity and a network link rate is not an application transfer rate. Enter the specification you actually have and read which losses the calculator includes.
Use results for planning and comparison, then validate them against device documentation and a real workload. Software overhead, thermal limits, aging, protocol headers, display brightness and charger efficiency can move an observed result away from a clean equation. Security-sensitive network changes should be reviewed before deployment.
Three checks that change the answer
Distinguish capacity from throughput
Bytes stored, bits transferred per second and real completion time are different quantities.
Include efficiency and overhead
Conversion losses, reserved capacity and protocol overhead reduce usable output.
Treat infrastructure output as planning data
Review storage, energy and device documentation before committing to a service or hardware configuration.
Before you use the answer
- Confirm bits versus bytes and decimal versus binary prefixes.
- Use average and peak load where both matter.
- Include stated efficiency or overhead.
- Validate the result with device or platform documentation.
Browse all 7 technology calculators
Every tool calculates in your browser. Pages marked “Reviewed guide” also include topic-specific explanations and source checks.
- Aspect Ratio CalculatorReviewed guideScale image or video dimensions while preserving a selected width-to-height ratio.
- Screen PPI CalculatorReviewed guideCalculate pixel density, pixel pitch and physical screen dimensions.
- File Size CalculatorReviewed guideEstimate media file size from bitrate and duration or the bitrate available for a size limit.
- Battery Runtime CalculatorReviewed guideEstimate usable energy and runtime from battery voltage, capacity, load and efficiency.
- Solar Panel CalculatorReviewed guideEstimate array size, panel count and annual production from energy use and solar-resource assumptions.
- EV Charging Cost CalculatorReviewed guideEstimate energy from the wall, charging time and cost for a battery state-of-charge change.
- Cloud Storage Cost CalculatorReviewed guideModel monthly cloud-storage cost from capacity, retrieval, egress and request assumptions.
Frequently asked questions
Why is usable storage lower than advertised?
Decimal capacity, binary reporting, formatting and reserved system space can all contribute.
Does a battery-runtime result include aging?
Only if the entered usable capacity or efficiency accounts for it.
Is link speed the same as download speed?
No. Protocol overhead, congestion, server limits and signal quality can reduce application throughput.
Can a calculator configure my device or service?
No. It reports an estimate; changing hardware, energy or cloud settings is a separate administrative action.
Reference starting points
Individual reviewed guides cite the equation or standard used by that calculator. These authorities provide broader context for this collection.