XYCalc

Online Calculator

A free online calculator with a big keypad, percentages, memory and a history of your sums. Switch to scientific mode for trig, logs and powers.

New: please check your results.

XYCalc
DEG
300

You might also need

  • Scientific Calculator

    Read more

    A free online scientific calculator: sin, cos, tan and inverses in degrees or radians, logs, powers, roots, factorials, π and e, with history.

  • Percentage Calculator

    Read more

    Work out a percentage of a number, what percentage one number is of another, percentage change, and adding or taking off a percentage.

  • VAT Calculator (UK)

    Read more

    Add VAT to a price or take it off, at 20%, 5% or any rate. Shows the VAT amount and the prices with and without VAT.

  • Area Calculator

    Read more

    Work out the area of a rectangle, triangle, circle, trapezium, parallelogram or ellipse in m², ft², acres or hectares, with the formula.

  • Volume Calculator

    Read more

    Work out the volume of a box, cylinder, sphere, cone or pyramid in m³, litres, ft³ or gallons, with the formula for each shape.

  • Ratio Calculator

    Read more

    Simplify a ratio, find the missing number in an equal ratio, or share an amount in a ratio such as 2:3:5. With the working shown.

What it does

A simple calculator for everyday sums. Tap the keys or type with your keyboard, and the answer updates as you go. It follows the proper order of operations (so 2 + 3 × 4 is 14), handles percentages the way a desk calculator does, and keeps a history of your recent sums so you can reuse them.

Need more? Switch Mode to Scientific for sin, cos, tan, logs, powers, roots and factorials. Advanced adds +VAT and −VAT keys, answers as fractions and a fixed number of decimal places. Tap the copy icon on the screen to copy the answer.

How to use it
Mode

Basic shows a simple keypad with percent and memory keys. Scientific adds trigonometry, logs, powers, roots, factorials, π and e. Advanced adds +VAT and −VAT, answers as fractions (a/b) and a fixed number of decimal places (Fix); its extra keys scroll while the number pad and the screen stay put.

Angles in

Whether sin, cos and tan (and their inverses) use degrees or radians. School maths and most practical work use degrees; calculus uses radians.

Sum

Tap the keys or type with your keyboard: + − × ÷ (or * and /), ^ for powers, ! for factorials, and brackets. Enter or = saves the answer to your history; tap a past sum to use it again.

Common uses

The formula
Order: brackets, then powers, then × and ÷, then + and −a + b% = a + (a × b ÷ 100), e.g. 250 + 20% = 300a − b% = a − (a × b ÷ 100), e.g. 80 − 25% = 60b% on its own = b ÷ 100, e.g. 50% × 80 = 40

Where:

%
per cent: out of 100

Answers are shown to 12 significant figures, which hides the tiny rounding errors computers make (so 0.1 + 0.2 shows as 0.3).

Worked example

For 250 + 20%:

  • 20% of 250 is 250 × 20 ÷ 100 = 50
  • 250 + 50 = 300

Questions people ask

How does the percent key work?

Like a desk or phone calculator: 250 + 20% adds 20% of 250, giving 300, and 250 − 20% takes it off, giving 200. Anywhere else, % just means divide by 100, so 20% × 250 is 50.

Why is 2 + 3 × 4 = 14 and not 20?

Multiplication and division are done before addition and subtraction, as in maths lessons (often remembered as BODMAS or BIDMAS). Use brackets to change the order: (2 + 3) × 4 = 20.

How do the memory keys work?

M+ adds the current answer to the memory, M− takes it away, MR puts the memory into your sum, and MC clears it. The memory and history stay on this page only; nothing you type is saved or sent anywhere.

Last checked 31 October 2026 · Last rev. 31 October 2026 · 4dc9