20 free tools

Calculators

Everyday, work, and study calculators. Calculators for the questions that come up at work, at school, and around the house: what a percentage works out to, what an hourly rate is as a salary, how many hours are on a time card, what grade you need on a final. Each one shows its working or its formula, and its assumptions are documented on the methodology page.

All 20 Calculators

Time Card CalculatorCalculate hours, overtime, and gross pay from daily punches.Hourly to Salary CalculatorConvert hourly wage to annual salary and back.Salary to Hourly CalculatorConvert an annual salary into an hourly, weekly, or monthly rate.Days CalculatorCount the days between two dates, or add/subtract days from a date, including a business-days count.GPA CalculatorCalculate your semester or cumulative GPA on the standard 4.0 scale from grades and credits.Grade CalculatorCalculate your weighted average grade, or find the score you need on the final to hit your target.Due Date CalculatorEstimate your baby's due date from your last period, conception date, or IVF transfer date.Invoice GeneratorBuild an invoice with line items and download as PDF.SaaS Cost CalculatorCompare per-seat SaaS pricing and total cost of ownership.Moving Cost CalculatorEstimate moving costs by city distance and home size. Compare movers, containers, and truck rentals.Percentage CalculatorCalculate percentages, percentage of a number, and percent change.Age CalculatorCalculate exact age or time between two dates.BMI CalculatorCalculate Body Mass Index from height and weight.Tip CalculatorCalculate tip amount and split the bill between people.Discount CalculatorCalculate sale price and savings after a percentage discount.Overtime CalculatorCalculate regular and overtime pay from hourly rate and hours worked.Calorie CalculatorEstimate daily calorie needs (TDEE) for maintenance, loss, or gain.Wedding Cost CalculatorSplit a wedding budget across venue, catering, and more, by country.Baby Cost CalculatorSplit a first-year baby budget across gear, diapers, and more, by country.Vacation Budget CalculatorSplit a trip budget across flights, stay, and activities, by country.

Which one do you need?

The tools above overlap in places. This is the quickest way to pick the right one.

You need a percentage, a change, or a reverse percentage
Percentage CalculatorCovers all three phrasings of the question on one page.
You need an hourly rate as an annual figure
Hourly to Salary CalculatorThe first step before comparing an offer against a salaried role.
You are adding up hours from daily punches
Time Card CalculatorWeekly or biweekly, with overtime and gross pay from the same entries.
You are splitting a restaurant bill
Tip CalculatorTips on the pre-tax amount if you enter the tax, and can round each share up.
You need a semester or cumulative GPA
GPA CalculatorWeights each course by its credits on the standard 4.0 scale.
You need the days between two dates, or a date some days away
Days CalculatorIncludes a business-days count as well as calendar days.

Frequently asked questions

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