MATH

Math & Money calculators

Calculators that turn two numbers into an answer: what 25% of 80,000 is, what a 20% discount plus a 10% coupon really comes to, how much something rose against last year. Every page prints the formula it uses, so you can check the result by hand. The unit converter works the same way, on the exact international definitions of the inch, the pound and the gallon, and the BMI calculator turns a height and a weight into the index with the cut-offs it was read against.

Where money is involved, the basis is stated. The brokerage-fee calculator uses the rates and caps in the Korean real-estate brokerage regulations, and the pyeong converter works from the exact value of 1 pyeong = 400/121 m². Anything that varies from person to person — tax, a negotiated rate — is an input, not an assumption.

8 tools

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Percentage CalculatorAnswer the three most common percentage questions instantly — everything runs in your browser.

ExampleTip: what is 15% of $64? — Type 15 and 64 into “What is X% of Y?”. The result is 9.6, so a 15% tip on a $64 bill is $9.60.

Discount CalculatorEnter a price and a % off to see the sale price and exactly how much you save.

Example25% off a $80 jacket — The discount is $20, so the sale price is $60. You save $20.

Korean Brokerage Fee CalculatorThe most an agent can charge on a housing deal — bracket, rate and cap shown, VAT optional.

ExampleBuying a ₩300,000,000 flat — A sale between 200 million and 900 million won is capped at 0.4%, so the most the agent can charge is ₩1,200,000. If the agent is a general taxpayer, 10% VAT comes on top: ₩1,320,000. The seller pays their own agent the same ceiling separately.