Square Footage Calculator
Calculate square footage for rectangles, triangles, or circles. Convert to sq yd, sq m, and acres. Add price per sq ft for total cost. Free area calculator.
Area Calculator
Calculate the area of 7 common shapes instantly. Real-time results, formula display, and multiple unit options. Perfect for students, teachers, and DIY projects.
Lighting Calculator
Free lighting calculator converts between lumens, lux, candela, footcandles, and watts. Perfect for lighting design, LED retrofits, and room planning.
GPA Calculator
Quickly calculate your grade point average with our free GPA calculator. Add courses, credits, and grades – including previous GPA for cumulative results.
Electricity Bill Calculator
Free electricity bill calculator to estimate energy consumption and cost. Select your country and appliance to calculate daily, monthly, and yearly electricity expenses in local currency.
Online Ruler
A free, full-featured online ruler with dual measurement systems (metric/imperial), screen calibration, and crosshair tracking.
Payment Calculator
Calculate loan payments instantly with our free tool. Visual breakdowns, accurate estimates, no registration required. Perfect for mortgages, auto loans, and personal financing.
Salary Calculator
Convert wages across hourly, daily, weekly, monthly, and annual periods with real tax and time-off adjustments. See your true take-home pay.
Grade Calculator
Plan your academic success with our comprehensive grade calculator. Track your current course grade, predict final outcomes, and determine exactly what you need on exams to reach your goals.
EMI Calculator
Calculate your Equated Monthly Installments with precision and plan your finances better