Other Calculators
Collection of free online calculators for age, date, time, grade, tip, fuel, concrete, and electrical calculations.
Age Calculator
Calculate exact age in years, months, days, hours, and minutes from date of birth.
Date Calculator
Add or subtract days, weeks, months, or years from a starting date.
Days Between Dates
Count the days, weeks, months and business days between two dates.
Time Calculator
Add, subtract, and convert hours, minutes, and seconds.
Hours Calculator
Calculate total work hours and pay between clock-in and clock-out times.
GPA Calculator
Calculate high school and college Grade Point Average (GPA) with course credits.
Grade Calculator
Weighted course grade from assignments and exams, plus the score you need on the final.
Final Grade Calculator
The score you need on your final exam, for your target grade and for every letter grade.
Height Calculator
Predict adult height for children based on parents’ height measurements.
Concrete Calculator
Estimate cubic yards and 80lb bags of concrete needed for slabs and footings.
IP Subnet Calculator
Calculate network address, broadcast address, and CIDR subnet mask ranges.
Dice Roller
Roll custom dice (d4, d6, d8, d10, d12, d20, d100) for tabletop games.
Fuel Cost Calculator
Estimate trip gas expenses based on driving distance, MPG, and fuel prices.
Square Footage Calculator
Calculate area sq ft for rooms, flooring, painting, and construction projects.
Roof Pitch Calculator
Convert roof pitch to degrees and percent; get rafter length, roof area and code minimums.
Tip Calculator
Calculate restaurant bill gratuity tips and split payments per person.
Ohms Law Calculator
Calculate Voltage (V), Current (I), Resistance (R), and Electrical Power (P).
Roman Numeral Converter
Convert numbers to Roman numerals and parse Roman numerals into numbers.
Sleep Calculator
Calculate optimal bedtime and wake-up times based on 90-minute sleep cycles.
Density Calculator
Calculate material density, mass, or volume using the formula ρ = m / V.
Tile Calculator
Estimate floor and wall tiles needed including waste percentage buffers.
File Health Checker
Diagnose and fix CSV, JSON, Image, and PDF files. Auto-detect errors, duplicates, and sensitive data.