4 Function Calculator
A 4 function calculator is a basic calculator that performs addition, subtraction, multiplication and division. A four-function calculator works one step at a time: enter a number, press an operation key, enter a second number and press equals. The result stays on the display and becomes the first number of the next calculation.
↻ The result becomes the first number of the next calculation
4 Main Benefits of a Basic Calculator
This basic math calculator runs in your browser, takes keyboard input and keeps a tape of your last 30 calculations. Basic calculators offer 4 main benefits: speed, low cost, a short learning curve and wide acceptance on standardized tests.
Speed
Each operation runs the moment you press the next key.
Low Cost
A four-function model typically costs $5 to $15.
Short Learning Curve
Enter a number, press an operation key, enter a second number and press equals.
Wide Acceptance on Standardized Tests
Several standardized tests list a four-function calculator as the minimum or maximum allowed device.
Students, shoppers, bookkeepers and small business owners use a basic calculator for shopping totals, bill splits, budgets, sales tax and homework checks.
The main parts of a four-function calculator are the keypad, display screen, numeric keys, operation keys, equals key, decimal point key and clear keys. Most models add a square root key, a percent key and a memory register.
What Is a 4 Function Calculator?
A 4 function calculator is a calculator limited to addition, subtraction, multiplication and division. The four operations are the full specification, with no trigonometry, logarithms, powers key or graphing.
- Trigonometry
- Logarithms
- Powers key
- Graphing
7 Common Names
The same device goes by 7 common names. Exam boards and product listings prefer "four-function calculator" since the name states exactly what the device does.
3 Extra Keys on Most Models
Most models add 3 extra keys. The device keeps the four-function label, since each extra key is a shortcut for arithmetic rather than a new type of math.
Square Root Key (√)
Returns the square root of the displayed number.
Percent Key (%)
Calculates a percentage in one keystroke.
Memory Register
Memory Plus (M+), Memory Minus (M−), Memory Recall (MR) and Memory Clear (MC).
6 Physical Formats
Physical four-function calculators come in 6 formats.
6 Main Physical Parts
A four-function calculator has 6 main physical parts.
Keypad
Holds the numeric keys (0 to 9), operation keys (+ − × ÷), equals key (=), decimal point key (.) and clear keys.
Display Screen
Shows 8 digits on pocket models and 10 to 12 digits on desktop models.
Solar Panel
Supplies energy on solar models.
Battery Compartment
Holds a coin cell or AAA battery.
Circuit Board
Connects the keys to the microprocessor.
Microprocessor
Performs each calculation.
What Can You Calculate With a 4 Function Calculator?
You can calculate sums, differences, products, quotients, percentages and square roots with a 4 function calculator. Any problem that breaks down into the four basic operations fits on the keypad.
6 Everyday Calculations
There are 6 everyday calculations a basic calculator handles well.
Shopping Totals
Add item prices at the store.
Bill Splits
Divide a restaurant total among a group.
Unit Prices
Divide a package price by its weight: 12 ounces (340 grams) for $4.80. Compare sizes with the Unit Price Calculator.
Unit Conversions
Multiply by a fixed factor.
Room Areas
Multiply length by width.
Grade Averages
Add scores and divide by the number of scores. Try the Average Calculator, or the Grade Calculator for letter grades.
Where Basic Calculators Are Used
Classrooms
Elementary and middle school classrooms rely on the basic arithmetic calculator, and some state tests for lower grades allow no other type. To see the written methods worked out by hand, use the Long Division and Multiplication calculators.
Accounting & Bookkeeping Offices
Offices use the desk calculator and printing calculator, where a paper tape records every entry.
How to Use the 4 Function Calculator
To use the arithmetic calculator, type the first number, press an operation key, type the second number and press = or Enter. The full process takes 5 steps.
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Type the First Number
Type the first number with the on-screen keypad or your keyboard.
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Press an Operator
Press an operator: + − × or ÷
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Type the Second Number
Type the second number.
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Press = or Enter
Press = or the Enter key to see the result.
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Continue Calculating
Continue with another operator to use the result as the first number of the next calculation.
7 Control Keys
The calculator has 7 control keys, plus 4 memory keys (MC, MR, M+ and M−).
Your Calculation Tape
The tape records your last 30 calculations, newest first. Scroll back through the tape to find the line where a running total went wrong, instead of retyping every figure. The tape clears when you reload the page.
Any Device, Private and Offline
The four function calculator online works in any browser on Windows, Mac, Android and iOS, and nothing you type goes to a server. Offline mode keeps the calculator running after your connection drops, once the page has loaded.
4 Function Calculator Examples
There are 7 common 4 function calculator examples, covering each operation, conversions, averages and mixed operations.
Grocery Total
Monthly Budget Left
Room Area
Bill Split for 4 People
Miles to Kilometers
Test Score Average
Mixed Operations: 2 + 3 × 4
Typing 2 + 3 × 4 = in that order returns 20 on most four-function calculators, and the mathematically correct answer is 14.
Can a 4 Function Calculator Calculate Percentages?
Yes, a 4 function calculator calculates percentages with the percent (%) key or by converting the percent to a decimal.
There are 5 common percentage calculations:
The percent key behaves differently across brands, so test the key with 200 × 10 % before relying on it.
A standard model returns 20. The decimal method gives the same answer on every model.
4 Function vs Scientific Calculator
A 4 function calculator performs basic arithmetic one step at a time, and a scientific calculator adds powers, roots, logarithms, trigonometry, constants and order of operations. Graphing and financial calculators extend the range further.
| Type | Operations | Typical use | Typical price (USD) |
|---|---|---|---|
| Four function | + − × ÷, often √, % and memory | Everyday arithmetic, money, elementary and middle school | $5 to $15 |
| Scientific | Adds powers, roots, logarithms, trigonometry, constants, parentheses | High school science and math, engineering | $10 to $25 |
| Graphing | Adds function plotting, tables, programs | Algebra 2, calculus, statistics | $90 to $150 |
| Financial | Adds time value of money, amortization, cash flows | Finance, accounting, real estate | $30 to $60 |
Which Calculator Should You Choose?
Basic Model
- Shopping
- Household budgets
- Elementary & middle school math
- Bookkeeping
Scientific Calculator
- Algebra
- Chemistry
- Physics
- Engineering
Graphing Calculator
- Calculus
- Statistics
Financial Calculator
Such as the HP 10bII.
- Loans
- Mortgages
- Investment returns
A four function calculator covers addition, subtraction, multiplication and division with a keypad, display screen, square root key, percent key and memory register. Use this four function calculator online for everyday arithmetic, and bring a physical basic calculator to standardized tests.
Specialized 4 Function Calculators
Specialized tools for every math scenario — pick the one that matches your calculation needs.
Frequently Asked Questions
Does a 4 function calculator have a square root?
Yes, most 4 function calculators have a square root (√) key. Type 144 and press √ to get 12. The TI-108, Casio SL-300 and Sharp EL-240 all include a square root key. A four-function calculator has no cube root or nth root key.
How do you calculate exponents on a basic calculator?
Not directly, since there is no exponent key. Calculate powers with repeated multiplication: 2 × 2 × 2 × 2 = 16 returns 2 to the 4th power. Many models square the displayed number when you press × then =, so 5 × = returns 25.
Does a 4 function calculator use parentheses?
No, it does not use parentheses. Work out each grouped part separately and store results in the memory register. Calculate (8 + 4) × (10 − 3) in 4 steps:
- Press 8 + 4 = to get 12.
- Press M+ to store 12.
- Press 10 − 3 = to get 7.
- Press ×, then MR, then = to get 84.
Does a 4 function calculator follow the order of operations?
No, most 4 function calculators do not follow the order of operations. A basic calculator evaluates each operation as you press it, so 2 + 3 × 4 = returns 20 instead of 14. Enter multiplication and division first, or use an order of operations calculator for mixed expressions.
What is the difference between a 4 function and scientific calculator?
The difference between a 4 function and scientific calculator is the range of operations and the order of evaluation. A four-function calculator handles addition, subtraction, multiplication and division one step at a time. A scientific calculator adds powers, roots, logarithms, trigonometry, constants and parentheses, and evaluates a full expression with the order of operations.
Can a 4 function calculator handle negative numbers?
Yes, a 4 function calculator handles negative numbers. Results below zero show a minus sign: 15 − 22 = returns −7. Enter a negative number with the +/− key, or subtract from zero on models without that key: 0 − 7 = returns −7.
Can a 4 function calculator work with decimals?
Yes, a 4 function calculator works with decimals through the decimal point key. Type 3.75 × 2.4 = to get 9. Pocket calculators display 8 digits, so 1 ÷ 3 returns 0.3333333. Many desktop and printing calculators include a decimal selector switch that fixes results at 0, 2 or 4 decimal places, with 2 places set for money.
Start Calculating Now
Use this free online 4 function calculator for addition, subtraction, multiplication, and division. No downloads, no sign-ups.
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