Free · No Login · Updated 2026
Free Math Calculators —
10 Tools, Instant Results
Basic arithmetic to advanced equations. Percentages, fractions, roots, exponents, unit conversions and more. All calculators are free, private and work on any device.
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All 10 Math Calculators
Basic Calculator
Arithmetic
Scientific Calculator
Trig · Log · Powers
Percentage Calculator
% of · % change
Fraction Calculator
Add · Subtract · Multiply
Square & Cube Root
Roots · nth Root
Exponent Calculator
Powers · Notation
Equation Solver
Linear · Quadratic
Ratio Calculator
Simplify · Proportion
Unit Converter
Length · Weight · Temp
Distance Calculator
Cities · km · miles
🧮 Basic & Scientific — 2 Tools
Basic & Scientific Calculators
From simple arithmetic to trigonometry and logarithms — two all-purpose calculators for everyday and advanced maths.
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Basic Calculator
Clean, fast arithmetic — add, subtract, multiply and divide. Works perfectly on mobile and desktop.
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Scientific Calculator
Trigonometry (sin, cos, tan), logarithms, powers, roots and advanced functions for students and engineers.
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🔬 Basic vs Scientific — Which One Do You Need?
Use the Basic Calculator for everyday arithmetic and quick calculations. Use the Scientific Calculator for trigonometry, logarithms, powers and anything involving brackets or function notation.
🔢 Numbers & Operations — 4 Tools
Numbers & Operations Calculators
Percentages, fractions, square roots and exponents — four essential calculators for number operations at any level.
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Percentage Calculator
Calculate percentage of a number, percentage change (increase/decrease), and what percentage one number is of another.
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Fraction Calculator
Add, subtract, multiply and divide fractions. Automatically simplifies results to the lowest terms and shows step-by-step working.
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Square Root & Cube Root Calculator
Calculate square roots (√), cube roots (∛) and nth roots of any positive or negative number instantly.
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Exponent & Power Calculator
Calculate any base raised to any power — positive, negative, fractional exponents and scientific notation included.
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Quick Reference — Common Percentage Formulas
| Calculation | Formula | Example |
|---|---|---|
| X% of Y | (X ÷ 100) × Y | 20% of 150 = 30 |
| X is what % of Y | (X ÷ Y) × 100 | 30 is 20% of 150 |
| % Increase | ((New − Old) ÷ Old) × 100 | 120 → 150 = +25% |
| % Decrease | ((Old − New) ÷ Old) × 100 | 150 → 120 = −20% |
| Add % to number | X × (1 + Rate/100) | 100 + 15% = 115 |
| Remove % from number | X ÷ (1 + Rate/100) | 115 ÷ 1.15 = 100 |
📐 Algebra & Ratios — 2 Tools
Algebra & Ratio Calculators
Solve equations step by step and simplify or compare ratios — for students, cooks, architects and anyone working with proportions.
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Equation Solver Calculator
Solve linear, quadratic and polynomial equations with full step-by-step solutions. Enter any equation and get the roots instantly.
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Ratio Calculator
Simplify ratios, solve proportions and scale any ratio up or down. Useful for recipes, maps, blueprints and mixing quantities.
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Equation Solver — What Types Can It Solve?
| Equation Type | Example | Method Used |
|---|---|---|
| Linear (1 variable) | 3x + 5 = 20 | Isolation / rearrangement |
| Quadratic | x² − 5x + 6 = 0 | Quadratic formula / factoring |
| Simple polynomial | x³ − 8 = 0 | Root finding |
| Proportion | x/4 = 3/12 | Cross-multiplication |
🔄 Conversions & Measurement — 2 Tools
Unit Converter & Distance Calculator
Convert between metric and imperial units, and calculate real-world distances between any two cities or locations worldwide.
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Unit Converter
Convert length, weight, temperature, volume, speed, area and more — between metric and imperial in a single click.
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Distance Calculator
Calculate straight-line distance between any two cities or coordinates worldwide — in kilometres or miles. Useful for travel and relocation planning.
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Common Unit Conversions — Quick Reference
| Category | From | To | Multiply By |
|---|---|---|---|
| Length | Inches | Centimetres | × 2.54 |
| Length | Miles | Kilometres | × 1.60934 |
| Weight | Pounds (lbs) | Kilograms | × 0.453592 |
| Weight | Kilograms | Pounds (lbs) | × 2.20462 |
| Temperature | Celsius (°C) | Fahrenheit (°F) | (°C × 9/5) + 32 |
| Temperature | Fahrenheit (°F) | Celsius (°C) | (°F − 32) × 5/9 |
| Volume | Litres | Gallons (US) | × 0.264172 |
| Speed | km/h | mph | × 0.621371 |
FAQ
Frequently Asked Questions
Yes — all 10 math calculators on Sitnit are completely free. No registration, no email, no subscription. They work instantly on any device.
The Basic Calculator handles addition, subtraction, multiplication and division. The Scientific Calculator adds trigonometry (sin, cos, tan), logarithms, exponents, brackets and more — it’s designed for students and engineers.
Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result is an increase, negative is a decrease. The Percentage Calculator does this instantly — just enter the two values.
Find the lowest common denominator (LCD), convert both fractions to that denominator, then add the numerators. The Fraction Calculator handles this automatically and shows each step.
The square root of a negative number is an imaginary number, expressed using the symbol i (where i = √−1). For example, √−9 = 3i. The Square Root Calculator handles both real and imaginary results.
Use the quadratic formula: x = (−b ± √(b² − 4ac)) / 2a, where a, b and c are the coefficients in ax² + bx + c = 0. The Equation Solver solves quadratic equations step by step — just enter your values.
The Unit Converter covers length, weight, temperature, volume, speed, area, energy and pressure — across both metric and imperial systems. All conversions are instant and require no reload.
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