Free online calculators that just work.
Instant, ad-light calculators for construction, finance, health, math, and dates — plus unit converters. No login, no clutter — just answers, with the math shown.
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- Tip CalculatorCalculate a tip and split the bill fairly among any number of people.
- Fraction CalculatorAdd, subtract, multiply, or divide fractions, and convert decimals to fractions.
- Scientific CalculatorA full scientific calculator with trig, logs, exponents, and memory.
- Grade CalculatorFind out what score you need on your final, or calculate a weighted average.
- GPA CalculatorCalculate your GPA — weighted and unweighted, with cumulative terms rolled in.
- Percentage CalculatorCalculate percentages, percentage change, and add or subtract a percentage.
- Age CalculatorCalculate your exact age, convert dog years, or find your retirement age.
- Due Date CalculatorEstimate your due date, conception date, and how far along you are.
- Pregnancy CalculatorTrack pregnancy week by week from your due date or last period.