omacusPercentages, the way you'd say them
Discounts, tax, tips, raises and "what percent is that?" all have a natural phrasing. Omacus understands them, so 15% off $1,299 gives $1,104.15 without reaching for a formula.
Omacus is a free notepad calculator for Linux, macOS and Windows. Each line is calculated as you type, so you can try a discount, add tax on the next line and see both answers at once.
Every phrasing, at a glance
| You type | Omacus shows |
|---|---|
20% of 340 | 68 |
5% on $200 | $210 |
15% off $1,299 | $1,104.15 |
$100 - 20% | $80 |
$50 + 8% tax | $54 |
$120 as % of $480 | 25% |
6 is what % of 120 | 5% |
40 is 20% of what | 200 |
5% of what is 6 | 120 |
Of, on and off
of takes a share: 20% of 340 is 68. on adds it, for tax or a markup: 5% on $200 is $210. off takes it away, for a discount: 15% off $1,299 is $1,104.15.
Adding or taking off a percentage
Writing + or - a percentage means a percentage of that amount, the way a shop or a receipt uses it. You can name what it's for after it:
| You type | Omacus shows |
|---|---|
$100 - 20% | $80 |
$50 + 8% tax | $54 |
€50,000 + 20% VAT | 60,000 EUR |
$2,000 - 15% discount | $1,700 |
What percent is it?
To find a percentage, ask for one. Both as % of and is what % of work:
| You type | Omacus shows |
|---|---|
$120 as % of $480 | 25% |
6 is what % of 120 | 5% |
12 as a % of 48 | 25% |
And to work backwards from a percentage to the whole:
| You type | Omacus shows |
|---|---|
40 is 20% of what | 200 |
5% of what is 6 | 120 |
Everyday examples
| You type | Omacus shows |
|---|---|
Tip: 18% of $64 | $11.52 |
salary = $85,000 | $85,000 |
raise = 4.5% on salary | $88,825 |
raise - salary | $3,825 |
3% of $250,000 | $7,500 |
Shopping for a laptop
A discount, sales tax and a comparison with another store's price in pounds, on one page:
- # New laptop
- price = $1,299$1,299
- deal = 15% off price$1,104.15
- with_tax = deal + 8.875%$1,202.14
- monthly = with_tax / 12$100.18
- // same model, from the UK store
- uk = £1,049 in USD$1,391.15
- uk - with_tax$189.01
Questions
What does $100 - 20% give?
$80. A percentage added to or taken from an amount is a percentage of that amount, like on a receipt.
How do I calculate what percent one number is of another?
Write 6 is what % of 120 or 6 as % of 120. Omacus answers 5%.
How do I add sales tax or VAT?
Use on or +: 5% on $200 or $200 + 5% tax. Both give $210.
How do I find the original price before a percentage?
Write 40 is 20% of what (200), or 5% of what is 6 (120).