5 Free Online Math and General Calculators for Everyday Use
Free math calculators: Basic Calculator, Scientific Calculator, Percentage Calculator, Unit Converter, and Date Difference/Age Calculator. All free at Jayax.dev.
5 Free Online Math and General Calculators for Everyday Use
Published: May 14, 2025 | Author: Jay | Reading Time: 6 min read
Table of Contents
- Everyday Calculations Made Easy
- Basic Calculator
- Scientific Calculator
- Percentage Calculator
- Unit Converter
- Date Difference / Age Calculator
- Frequently Asked Questions
- Conclusion
Everyday Calculations Made Easy
From splitting a restaurant bill to converting kilometers to miles, calculating percentages, or figuring out exactly how many days until a deadline — everyday math is constant. Having a reliable set of calculators bookmarked saves time and prevents errors.
Jayax.dev provides 5 free math and general calculators for everyday use. No installation, no ads blocking the buttons, no confusing interface — just clean, functional calculators.
Basic Calculator
What It Does
A clean, simple calculator for basic arithmetic: addition, subtraction, multiplication, and division.
Features
- Large, easy-to-tap buttons (mobile-friendly)
- Keyboard support (type numbers and operators directly)
- Chain calculations (result feeds into next operation)
- Clear and backspace functionality
- Decimal support
When to Use It
- Quick arithmetic without reaching for your phone
- Splitting bills and expenses
- Adding up costs
- Any simple calculation during work
Scientific Calculator
What It Does
A full-featured scientific calculator for advanced mathematical operations.
Supported Functions
| Category | Functions | |----------|-----------| | Trigonometry | sin, cos, tan, asin, acos, atan | | Logarithms | log (base 10), ln (natural) | | Powers | x², x³, xʸ, √x, ³√x | | Constants | π (pi), e (Euler's number) | | Other | factorial (n!), absolute value, modulo |
When to Use It
- Engineering calculations — Trigonometry for construction and design
- Statistics — Logarithms for data analysis
- Physics problems — Powers and constants
- Academic work — Homework and exam preparation
- Programming — Mathematical algorithm development
Percentage Calculator
What It Does
Calculate percentages in multiple ways:
- What is X% of Y? — e.g., What is 15% of 200? → 30
- X is what % of Y? — e.g., 30 is what % of 200? → 15%
- % change from X to Y — e.g., % change from 80 to 100? → 25% increase
Common Use Cases
| Calculation | Example | Result | |-------------|---------|--------| | Discount | 25% off Rp 400,000 | Rp 100,000 discount | | Tax | 11% VAT on Rp 1,000,000 | Rp 110,000 tax | | Tip | 15% tip on Rp 350,000 | Rp 52,500 tip | | Markup | Cost Rp 50,000, sell at 40% markup | Rp 70,000 selling price | | Grade | 85 out of 100 points | 85% |
Unit Converter
What It Does
Convert between common measurement units across four categories:
Length
| From | To | Multiply By | |------|----|-------------| | Meters | Feet | 3.28084 | | Kilometers | Miles | 0.621371 | | Centimeters | Inches | 0.393701 | | Meters | Yards | 1.09361 |
Weight
| From | To | Multiply By | |------|----|-------------| | Kilograms | Pounds | 2.20462 | | Grams | Ounces | 0.035274 | | Kilograms | Stones | 0.157473 |
Temperature
| From | To | Formula | |------|----|---------| | Celsius | Fahrenheit | (°C × 9/5) + 32 | | Fahrenheit | Celsius | (°F - 32) × 5/9 | | Celsius | Kelvin | °C + 273.15 |
Volume
| From | To | Multiply By | |------|----|-------------| | Liters | Gallons (US) | 0.264172 | | Milliliters | Fluid ounces | 0.033814 | | Liters | Quarts | 1.05669 |
Date Difference / Age Calculator
→ Try Date Difference Calculator
What It Does
Calculate the exact difference between two dates in years, months, and days. Also calculates exact age from birthdate.
Features
- Date difference — Years, months, days, weeks, and total days between any two dates
- Age calculator — Exact age from birthdate to today
- Business days — Count working days excluding weekends
- Add/subtract days — What date is X days from today?
Common Use Cases
- Age calculation — How old am I exactly?
- Project deadlines — How many days until the deadline?
- Event planning — How many weeks until the event?
- Employment duration — How long have I worked here?
- Legal dates — Contract durations, warranty periods
Frequently Asked Questions
Are these calculators free? Yes, all 5 math calculators are completely free with no usage limits.
Can I use the Scientific Calculator for exams? The calculator is web-based and requires an internet connection. Check your exam rules — many exams do not allow internet-connected devices.
How accurate is the Unit Converter? All conversion factors are precise to at least 6 decimal places, which is more than sufficient for everyday use and most professional applications.
Does the Date Difference Calculator account for leap years? Yes, the calculator correctly handles leap years, varying month lengths, and century leap year rules.
Can I use keyboard shortcuts with the Basic Calculator? Yes, you can type numbers and operators directly on your keyboard. Use Enter for equals and Escape or Delete for clear.
What is the difference between the Basic and Scientific Calculator? The Basic Calculator handles addition, subtraction, multiplication, and division. The Scientific Calculator adds trigonometric functions, logarithms, powers, roots, and mathematical constants.
Does the Percentage Calculator handle compound percentages? The calculator handles individual percentage calculations. For compound percentage changes (like year-over-year growth), use the Compound Interest Calculator.
Conclusion
Everyone needs reliable calculators for everyday math. The 5 free math and general calculators on Jayax.dev cover basic arithmetic, scientific functions, percentages, unit conversions, and date calculations — all in a clean, ad-free interface.
Start calculating:
- 🔢 Basic arithmetic → Basic Calculator
- 🔬 Advanced math → Scientific Calculator
- % Percentages → Percentage Calculator
- 📏 Unit conversions → Unit Converter
- 📅 Date calculations → Date Difference Calculator
Explore all 103+ free tools at Jayax.dev/tools.
