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Calculators

6 calculators. See the working for health, money, dates and everyday arithmetic, with each formula on the page.

Percentage, fast

work one out right here

240 × 1.15 = 276Open the full percentage calculator

All calculators

40 tools · 5 groups · 6 ready

Health & body

8

Finance

8
  • Loan Calculator

  • Mortgage CalculatorSoon

  • Compound InterestSoon

  • VAT CalculatorSoon

  • Discount CalculatorSoon

  • Savings GoalSoon

  • Car LoanSoon

  • Debt Payoff PlannerSoon

Dates & time

8
  • Age Calculator

  • Date DifferenceSoon

  • Days Until DateSoon

  • Add Days to DateSoon

  • Working DaysSoon

  • Time DurationSoon

  • Week NumberSoon

  • Time Zone ConverterSoon

Maths

8
  • Percentage Calculator

  • Fraction CalculatorSoon

  • Ratio CalculatorSoon

  • Average CalculatorSoon

  • Standard DeviationSoon

  • Prime CheckerSoon

  • GCD and LCMSoon

  • Scientific NotationSoon

Everyday

8

  • Tip CalculatorSoon

  • Split the BillSoon

  • Fuel CostSoon

  • Unit Price CompareSoon

  • Cooking ConverterSoon

  • Paint CoverageSoon

  • Grade CalculatorSoon

  • Random NumberSoon

About these calculators

Every calculator here prints the arithmetic behind the answer, because you cannot check a bare number. When you see that a BMI of 23.5 came from 74.5 ÷ 1.78², you can spot a mistyped digit and redo the sum anywhere.

Some formulas have more than one version in common use. Body fat has several, and so does resting metabolism. Where that happens, you choose the version, and the page says which one is the default and why.

Health calculators state their margins, because a screening ratio given to one decimal place suggests a precision it does not have. None of this is medical or financial advice, and the page never sends the figures you type anywhere.

Working
Every result shows the formula and the numbers put into it.
Units
BMI takes metric or imperial. Body fat and calories take metric.
Precision
Full precision in the working, rounded only for display.
Stored data
None. Health and money figures clear when you reload.

Frequently asked questions

Do you store the figures I type?
No. Every calculation runs in the page, which sends nothing. A reload clears the values, and there is no account to keep a history in.
Why show the formula?
So you can check it. A number on its own asks for trust, and a number with its working lets you spot a typo and repeat the sum elsewhere.
Are the health calculators medical advice?
No. They do screening arithmetic. The result gives you a rough idea, and it cannot replace a doctor who can examine you.
Which formula is the default?
The one most used for that calculation. The page names it, and where the choice matters you can change it.
Can I switch to imperial?
In the BMI calculator, yes. It takes feet, inches and pounds. The body fat and calorie calculators take metric units.
Is there a usage limit?
No. There is no account, and nothing counts how many sums you run.

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