Online Calculators
Free, accurate calculators for every subject. Enter values and get instant results with formulas and explanations.
Math Calculators
Percentages, fractions, GCF, LCM, rounding, scientific notation, exponents, and more.
47 tools
Statistics Calculators
Mean, median, mode, range, standard deviation, variance, z-score, percentile, quartile, IQR.
19 tools
Date & Time Calculators
Age, date difference, business days, hours, time duration, sleep, overtime.
33 tools
Algebra Calculators
Slope, distance formula, quadratic equation, linear equation, vertex, factoring.
14 tools
Finance Calculators
Profit margin, markup, discount, CAGR, break-even, compound interest.
20 tools
Health Calculators
BMR, TDEE, ideal weight, body fat, calorie, pace, heart rate.
20 tools
Physics Calculators
Velocity, acceleration, force, energy, waves, density, ideal gas law.
41 tools
Geometry Calculators
Area, perimeter, volume, surface area for 2D and 3D shapes.
27 tools
Construction Calculators
Concrete, square footage, gravel, paint, tile, roofing, mulch, stairs.
21 tools
Electrical Calculators
Ohm's law, watts, amps, volts, kWh, resistor color code, LED power.
17 tools