Use of
- In the top mode button, select the type of calculation you want.When you change the mode, the input box name automatically changes to suit that calculation.
- For example, if the “A’s B%?” mode is set, put a reference value (50,000) in A and a percentage (15) in B.
- to calculate If you press the button, the representative result will be widely displayed, and below comes the calculation formula and additional information.
- If you press the Copy Result button, you can copy the calculation result into text and paste it into a messenger or note.
Percentage calculation principle.
Percentage is a "percentage based on 100" and all four modes are sorted into one formula below.
| Mooded | Officially | 예시 |
|---|---|---|
| What is B%? | A × B ÷ 100 | 15% of 50,000 = 7,500 |
| How many percent? | A ÷ B × 100 | 30 is 25% of 120. |
| A is B rate. | (B − A) ÷ A × 100 | 100 → 130 is +30% increase |
| B% off / increase | A × (1 − B/100) / A × (1 + B/100) | 20,000 to 30% off 14,000 · Impressive 26,000 |
The basis of all percentage calculations. What is the rate?Especially in the amplification mode, the pre-variation value A is the base value. If you change from 100 to 150 (150−100)÷100×100 = +50 percent increaseBut if it turns from 150 to 100 (100−150)÷150×100 = Roughly −33.33% decreaseThe rate of increase varies depending on which side the same two numbers are based on.
Knowing good information.
Difference between percentage (%) and percentage point (%p) — the most mistaken part
In the news, the news that “interest rates have risen from 2% to 4%” can be expressed in two ways.
| expressed | calculated | Meaning of |
|---|---|---|
| 2% of P | 4% − 2% = 2%p | Simple percentage difference. |
| Increased 100% | (4−2) ÷ 2 × 100 = 100% | Changes in price ratio. |
Both expressions match, but meanings are completely different. When we talk about changes in values already shown as percentages, such as support rates, interest rates, and unemployment rates, The percentage point (% p)If you write "the support rate has risen from 30% to 33% 3%", it is a strictly wrong expression, and "3%p has risen" or "10% has risen" is correct.
Common Mistake: 50% discount after 50% discount is not profitable
A 50% discount on a $10,000 item is $5,000. here again a 50% discount is 5,000 × 1.5 = by 7500This is because the base value of the impression has changed to a discounted price ($10,000) rather than a price of $5,000. On the contrary, if you want to return to the original price, you have to increase from $5,000 to 100%. Remember that the base value changes every time you apply a percentage in a row.
A real life mode.
- What is B%? — When calculating how much 10% added tax is in a restaurant, and how much if you save a percentage of the annual salary.
- How many percent? When 68 of the 80 questions were met in the test, the correct answer rate and the achievement rate were compared to the target amount.
- A is B rate. — Compared to last year's sales growth rate, when checking the rate of electricity bill increase compared to last month.
- B% discount / discount — When you look at how much the sale price will be, how much should you pay if the monthly rate rises by 5%.
This calculator is a purely anatomical calculation tool. The result is a value rounded up from the second point, and separate criteria, such as unit processing regulations, can be applied to accurate accounting and tax calculations.
Frequently asked questions.
What is the difference between percentage (%) and percentage point (%p)?
A percentage (%) refers to the percentage itself, and a percentage point (%p) refers to an arithmetic difference of two percentage values. For example, if the interest rate increases from 2% to 4% it increases from 2%p to 100% when viewed as a percentage. If the two expressions are confused, the size of the change can be widely misread.
What are the criteria when calculating the rate?
The base value of the increase rate is always the value before change (A). The formula is ÷ the value before change × 100 (the value after change - the value before change). 100 to 150 is +50%, but 150 to 100 is about -33.33%, and the size of the increase varies according to the direction.
After a 50% discount, will you return to the original price?
No. A 50% discount of $10,000 will be $5,000, where a 50% increase will be $7,500 because the base value of the impression is the discounted price ($5,000), not the value of the unit.
How many points are indicated?
This calculator displays the results by rounding up to a second point of a small number, and without a small number if the whole number falls by a small number, it displays the result as an integer. There may be very subtle rounding errors due to the display number, so if you need a precise calculation, check the original formula together.
Is the entered number saved or transmitted?
All calculations are processed only in JavaScript within your browser and do not send or store input to the server.