Calculators tools

Arithmetic, scientific, fractions, percentages, tips, ages, dates, times, fuel costs, and pet ages — quick answers for everyday questions.

• Basic Calculator A straightforward four-function calculator with percentage and sign change. Mouse, touch, or keyboard.
• Scientific Calculator Full expression-parsing scientific calculator with trig, logs, factorials, and constants. Degree or radian mode.
• Fraction Calculator Exact arithmetic on fractions and mixed numbers. Useful for cooking, woodworking, sewing.
• Percentage Calculator Seven types of percentage calculation in one tool — percent of, increase, decrease, percent change, and more.
• Tip Calculator Calculate restaurant tip and total, split across multiple people. Handles pre-tax vs after-tax correctly.
• Age Calculator Calculate exact age in years, months, days, hours, and minutes. Find next birthday and day of week you were born.
• Date Calculator Add or subtract days from a date, find the duration between two dates, and look up the day of the week for any date.
• Time Calculator Add and subtract time durations, or find the elapsed time between two clock times. Handles overnight spans.
• Fuel Cost Calculator Estimate fuel cost for a trip. Handles L/100km, mpg (US and Imperial), and per-litre or per-gallon pricing.
• Pet Age Calculator Convert your pet's age to human-equivalent years. Dogs (by size), cats, rabbits, parrots, horses, and more.