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Quick tools

Calculators

Quick numeric answers for maths, physics and biology. Choose a tool, enter your values — no login. For full working and reasoning, use the main solver.

Numbers and operations

Fractions, percentages, powers and roots — what you need for homework and tests.

Simple calculator

Four operations plus memory and history. For quick numeric checks.

  • Addition, subtraction, multiplication, division
  • Memory (M+, M−, MR, MC) and history
  • Handy for maths practice

Fraction calculator

Arithmetic and simplification; mixed numbers and decimal conversion.

  • Fraction arithmetic
  • Auto simplify
  • Fraction ↔ decimal

Percentages

Part of whole, increase/decrease, ratios and change rate.

  • Percent of a number
  • Percent change
  • Ratios and rates

Powers and roots

Powers, scientific notation and link to nth roots.

  • Positive and negative powers
  • Scientific notation
  • Link with nth roots

Square and nth roots

Square, cube or nth root; exact or decimal output.

  • Square and cube roots
  • Simplify roots
  • Exact or decimal

Shapes and number systems

Area, volume, and decimal–binary–hex conversions.

Area calculator

Square, rectangle, triangle, circle and other 2D shapes; formulas on page.

  • Square, rectangle, triangle, circle
  • Formulas at a glance
  • Results in units (cm², m²)

Volume calculator

Cube, cuboid, sphere, cylinder, cone with formulas.

  • Curriculum solids
  • Formulas explained
  • Units cm³, m³

Binary converter

Decimal–binary conversion and base-2 arithmetic.

  • Decimal ↔ binary
  • Binary arithmetic
  • Number systems practice

Hexadecimal converter

Base-16 and 0x notation; decimal–hex conversion.

  • Decimal ↔ hexadecimal
  • 0x notation
  • Base-16 arithmetic