Download Time Calculator
Estimate download time from file size and connection speed.
Open calculatorWhat this category helps with
Technology calculators help with questions where a number is useful but the assumptions matter. Start with the calculator closest to your question, then use the linked guide or formula page when units, rates, dates, local rules or source data could change the answer.
Best starting points
Data Transfer Rate Calculator
Calculate transfer rate from data size and time.
Open calculatorFile Size Calculator
Estimate file size from bitrate and duration.
Open calculatorBitrate Calculator
Calculate bitrate from file size and duration.
Open calculatorAspect Ratio Calculator
Calculate aspect ratio from width and height.
Open calculatorPPI Calculator
Calculate screen pixel density from resolution and diagonal size.
Open calculatorHow to choose the right calculator
- Use a broad calculator first when you need a quick estimate.
- Use a more specific calculator when rates, units, dates, eligibility or fees change the answer.
- Read assumptions before comparing results across calculators or external sources.
- For current-data topics, confirm the data source and date before relying on the result.
Calculators
Download Time Calculator
Estimate download time from file size and connection speed.
Open calculatorData Transfer Rate Calculator
Calculate transfer rate from data size and time.
Open calculatorFile Size Calculator
Estimate file size from bitrate and duration.
Open calculatorBitrate Calculator
Calculate bitrate from file size and duration.
Open calculatorAspect Ratio Calculator
Calculate aspect ratio from width and height.
Open calculatorPPI Calculator
Calculate screen pixel density from resolution and diagonal size.
Open calculatorMegapixel Calculator
Convert image width and height in pixels to megapixels.
Open calculatorStorage Converter
Convert gigabytes to megabytes and terabytes using decimal units.
Open calculatorBinary Calculator
Convert a decimal integer to binary.
Open calculatorHex Calculator
Convert a decimal integer to hexadecimal.
Open calculatorIP Subnet Calculator
Calculate address count from IPv4 CIDR prefix length.
Open calculatorPassword Generator
Generate a random numeric password of a selected length.
Open calculatorVoltage Drop Calculator
Estimate voltage drop from current, resistance and one-way length.
Open calculatorResistor Calculator
Calculate resistance from voltage and current.
Open calculatorOhms Law Calculator
Calculate voltage from current and resistance.
Open calculatorElectricity Calculator
Calculate electricity cost from power, time and price.
Open calculatorBandwidth Calculator
Calculate transfer time from file size and bandwidth.
Open calculatorBase64 Encode / Decode
Encode text to Base64 in the browser.
Open calculatorURL Encode / Decode
Percent-encode text for use in URLs.
Open calculatorSolar Panel Savings Calculator
Estimate solar panel savings from user-entered values with a visible formula, assumptions, limitations and source notes. Use dated source values for any market, distribution, regional or price-sensitive input.
Open calculatorHeat Pump Savings Calculator
Estimate heat pump savings from user-entered values with a visible formula, assumptions, limitations and source notes. Use dated source values for any market, distribution, regional or price-sensitive input.
Open calculatorAppliance Energy Cost Calculator
Estimate appliance energy cost from user-entered values with a visible formula, assumptions, limitations and source notes.
Open calculatorEV Charging Time Calculator
Calculate ev charging time from user-entered values with a visible formula, assumptions, limitations and source notes.
Open calculatorLaptop Battery Life Calculator
Calculate laptop battery life from user-entered values with a visible formula, assumptions, limitations and source notes.
Open calculatorCloud Storage Cost Calculator
Estimate cloud storage cost from user-entered values with a visible formula, assumptions, limitations and source notes. Use dated source values for any market, distribution, regional or price-sensitive input.
Open calculatorAPI and Token Cost Calculator
Estimate api and token cost from user-entered values with a visible formula, assumptions, limitations and source notes. Use dated source values for any market, distribution, regional or price-sensitive input.
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