Everyday Calculator
Use it like the calculator on your desk: type a number, pick an operation and press =. The extra keys handle the sums that come up with money, such as adding sales tax, taking it back out or marking up a price.
Enter your figures below. Results update as you type.
How the Everyday Calculator calculation works
TAX+ = amount x (1 + rate / 100) TAX− = amount / (1 + rate / 100) a MU b = a x (1 + b / 100)
It works left to right, as desk calculators do, so 2 + 3 × 4 = 20. The percent key works the business way: 200 + 10 % gives 220, 200 − 10 % gives 180 and 200 × 10 % gives 20.
TAX+ adds sales tax at the rate shown and TAX− takes it back out, so at 8%, 100 becomes 108 and 108 goes back to 100. To change the rate, type it and press Set tax rate.
MU marks up a cost: 50 MU 40 = 70, a 40% markup. M+ and M− add the number on the screen to memory or take it away, MR brings it back and MC clears it. GT shows the grand total of every answer since the last AC.
Frequently asked questions
How do I add sales tax to a price?
Type the price and press TAX+. At the default 8% rate, 100 becomes 108. Type a different rate and press Set tax rate to change it.
How do I take tax out of a total?
Type the total and press TAX−. At 8%, 108 goes back to 100, and the line above the answer shows the tax that was included.
Why does 2 + 3 × 4 give 20?
Like a desk calculator, it works out each step as you go: 2 + 3 is 5, then 5 × 4 is 20. For the order-of-operations answer of 14, press 3 × 4 = first, then + 2 =.
What does the GT key do?
GT is the grand total. Every time you press =, the answer is added to it, so you can work out several lines of a bill and then see the total. AC clears it.
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