General Calculators

This is the catch-all shelf: everyday calculations that do not belong to one subject, from tips and discounts to lengths, rates and household costs. Pick a tool, enter the figures you already have, and get a straight answer without working through the arithmetic by hand.

Some questions come up once and do not fit a specialist category. A tip at a wedding, the right TV size for a room, the words on a cheque written out in full, or the value of a guitar chord change — the tools here cover that scattered ground. The Check Writing Calculator, the TV Size Calculator and the Guitar Chord Calculator sit alongside dozens of smaller helpers, each built around one ordinary job.

Much of the collection turns on comparing like with like. Cost tools put a price on groceries, plaster, bottled water or a sprayer job; rate tools work out click-through, billing, baud or yearly rates; length and volume tools handle rooms, wells, pipes and bolts. Discount and percentage tools do the same for prices and growth, so a sale price, a wedding tip or a year-over-year change can be checked in seconds rather than estimated.

The point throughout is practical: the inputs are the numbers a person would already know, and the output is a figure that can be used straight away, for a purchase, a job or a household decision.

    • Some questions come up once and do not fit a specialist category. A tip at a wedding, the right TV size for a room, the words on a cheque written out in full, or the value of a guitar chord change — the tools here cover that scattered ground. The Check Writing Calculator, the TV Size Calculator and the Guitar Chord Calculator sit alongside dozens of smaller helpers, each built around one ordinary job.

    Much of the collection turns on comparing like with like. Cost tools put a price on groceries, plaster, bottled water or a sprayer job; rate tools work out click-through, billing, baud or yearly rates; length and volume tools handle rooms, wells, pipes and bolts. Discount and percentage tools do the same for prices and growth, so a sale price, a wedding tip or a year-over-year change can be checked in seconds rather than estimated.

    The point throughout is practical: the inputs are the numbers a person would already know, and the output is a figure that can be used straight away, for a purchase, a job or a household decision.