Free online calculators and converters for everyday math — percentages, areas, unit conversions, proportions, and more.
Basic and scientific calculator for everyday math
Find percentages, increases, decreases, and ratios
Area and perimeter for 9 shapes with formula breakdowns
Solve direct proportions quickly with step-by-step results
Work out inverse proportions for speed, time, and resources
Compute sine, cosine, tangent, and more for any angle
Convert angles between radians and degrees instantly
Add GST, remove GST, or find the original price before tax
Convert length, weight, temperature, volume, and more
Trig, log, exponents, factorials, memory, and keyboard support
Interactive virtual abacus with clickable beads and live value
Calculate your Body Mass Index with metric or imperial units
Score your 501 and 301 darts games with checkout suggestions
Whether you need a quick percentage check before a meeting, an area formula for a home project, or a unit conversion while cooking, these tools give you accurate answers in seconds. Every calculator runs directly in your browser — nothing to install, no account to create, and no data ever leaves your device.