Generate prime numbers online. Get the first 1000 primes, primes in a range, nth prime, prime checker, CSV export, and formulas.
Calculate lumber board feet, project waste, boards needed, and estimated wood cost with this free Lumber Board Foot Calculator.
Estimate flooring area, waste, boxes, labor, materials, underlayment, removal, baseboards, tax, and total project cost.
Estimate paint for walls, ceilings, primer, doors, windows, trim, labor, supplies, gallons, litres, and total project cost.
Find Qibla direction from your location using GPS, city presets, latitude, longitude, true bearing, magnetic correction, and compass formulas.
Use a digital compass online with live heading, true and magnetic north, declination, GPS coordinates, target bearing, distance, and formulas.
Free geodesic bearing calculator using the Vincenty formula on WGS-84. Computes initial bearing, final bearing, and great-circle distance between any two GPS coordinates.
Use our free map scale calculator to convert any map distance to real-world distance. Supports km, miles, meters, feet, cm, and inches. Includes formulas, worked examples, and expert explanations.
Convert latitude and longitude between decimal degrees, DMS, DDM, radians, GeoJSON, WKT, GPS, batch CSV, distance, and bearing.
Compare time across multiple cities instantly with IANA time zones, UTC offsets, DST-aware conversion, meeting planner, CSV, and ICS export.