Free Online Math Tools: Calculator, Unit Converter & More
Math doesn't have to be intimidating. Armytool provides a collection of free, browser-based math tools that handle everything from basic calculations to complex conversions. No apps to install, no subscriptions—just open and calculate.
What's Covered
- 1. Scientific Calculator – Full Function Calculator
- 2. Unit Converter – Length, Weight, Temperature & More
- 3. Percentage Calculator – Increases, Decreases & More
- 4. Number Base Converter – Binary, Hex, Octal
- 5. Roman Numerals – Convert to/from Integers
1. Scientific Calculator – Full Function Calculator
A complete scientific calculator with support for trigonometry, logarithms, exponents, and parentheses. Includes history tracking so you can review previous calculations.
Calculator Functions
- Trigonometry: sin, cos, tan (in radians)
- Logarithms: log (base 10)
- Exponents: xʸ for power calculations
- Roots: √ for square root
- Constants: π (pi)
2. Unit Converter – Length, Weight, Temperature & More
Convert between units of length, weight, temperature, speed, area, volume, and digital data. Select your category, enter a value, and see instant conversions.
Available Conversions
- Length: mm, cm, m, km, in, ft, yd, mi, nautical mile
- Weight: mg, g, kg, oz, lb, stone, ton (metric/imperial)
- Temperature: Celsius, Fahrenheit, Kelvin
- Speed: m/s, km/h, mph, knots, Mach
- Area: mm², cm², m², ha, km², in², ft², acre
- Volume: mL, L, m³, tsp, tbsp, fl oz, cup, gal
- Data: B, KB, MB, GB, TB, PB, bit, kilobit, megabit
3. Percentage Calculator – Increases, Decreases & More
Calculate percentages, percentage increases/decreases, and find what percent one number is of another. Essential for finance, shopping, and data analysis.
4. Number Base Converter – Binary, Hex, Octal
Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Essential for programmers and computer science students.
Base Conversion Examples
- Decimal 255 → Binary: 11111111
- Decimal 255 → Hex: FF
- Binary 1010 → Decimal: 10
- Hex A3 → Decimal: 163
5. Roman Numerals – Convert to/from Integers
Convert between modern integers and ancient Roman numerals. Useful for dates, chapter numbers, clock faces, and historical documents.
Roman Numeral Reference
- I = 1, V = 5, X = 10
- L = 50, C = 100, D = 500, M = 1000
- Subtractive notation: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900
- Valid range: 1 to 3999
Why Use Armytool Math Tools?
All calculations happen instantly in your browser with zero server round-trips.
- ⚡ Instant: Results appear as you type
- 🔒 Private: No data leaves your device
- 📱 Responsive: Works on phones, tablets, desktops
- 💯 Free: No limits, no watermarks, no signup
Start calculating! Visit Armytool and open any tool from the Math category.