Calculate tips by entering a bill amount and selecting a tip percentage. Display total and per-person costs. Split bills among multiple people. Works on iPhone and iPad with a clean interface. Includes a small ad banner. Free to use.
Calculate depth of field by selecting frame size, aperture, focal length, and focusing distance. Determine foreground and background depth. Automatically compute hyperfocal distance. Adjust diffuse circle diameter for print size requirements.
Calculate price changes and target forecasts instantly. Determine profit and loss by entering trade size. Switch between calculation tabs for different strategies. Set principal to view overall performance. Review K-line charts for trend analysis.
Calculate VAT by entering a monetary value and adjusting the tax rate. Specify whether to add or remove tax from the amount. Tap controls or the background to hide the keyboard.
Calculate measurement errors using directivity and mismatch error tools. Convert ratios to decibels. Compute noise figures and antenna parameters. Input values and retrieve calculated results.