Everyday Productivity
Tools that help you stay focused, on time, and on top of everyday calculations — from timers and date math to health and finance.
Tools in This Collection
37 toolsAge Calculator
Calculate your exact age in years, months, and days from any date of birth, plus total days lived and days until your next birthday.
Average Calculator
Paste any list of numbers and instantly get the count, sum, and mean average, no spreadsheet required.
BMI Calculator
Calculate your Body Mass Index from height and weight, in metric or imperial units, and see your WHO weight category instantly.
BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at complete rest — using the Mifflin-St Jeor and Harris-Benedict equations.
Business Days Calculator
Count the working days (Monday to Friday) between two dates, or add a number of business days forward or backward from a start date.
Calorie Calculator
Find your daily calorie needs to lose, maintain, or gain weight, based on your BMR and activity level.
Compound Interest Calculator
See how savings grow over time with compound interest, including optional monthly contributions, at any compounding frequency.
Concrete Calculator
Work out how much concrete you need for a slab, footing or patio in cubic feet, cubic yards or cubic meters, plus bag counts.
Countdown Timer
Count down the days, hours, minutes and seconds to any future date or event — a live countdown running in your browser.
Date Difference Calculator
Calculate the exact number of days, weeks, and the calendar breakdown of years, months and days between any two dates, in either order.
Discount Calculator
Calculate the discount amount and final sale price, or work backwards from a sale price to find the original price.
Fuel Cost Calculator
Work out how much a trip will cost in fuel, using miles per gallon or liters per 100km, in imperial or metric units.
GPA Calculator
Calculate your Grade Point Average from your course credit hours and letter grades using the standard 4.0 scale.
Grade Calculator
Calculate your overall weighted course grade from individual assignment scores and their weight percentages.
Hourly to Salary Calculator
Convert an hourly wage into daily, weekly, monthly, and annual salary figures — or work backwards from salary to hourly rate.
Ideal Body Weight Calculator
Estimate a healthy target body weight from your height and gender, using four classic medical formulas — Devine, Robinson, Miller and Hamwi.
Invoice Generator
Create a professional invoice with line items, auto-calculated totals, and a live preview — print or save as PDF for free.
Loan Calculator
Calculate the monthly payment, total cost, and total interest for any personal, auto, or business loan.
Macro Calculator
Calculate your daily protein, carbohydrate and fat targets in grams, based on your calorie goal and a macro split that fits your diet style.
Meeting Planner
Add participants in different time zones, pick a date and time in your own zone, and see everyone's local time — updated live as you drag the slider.
Mortgage Calculator
Estimate your monthly mortgage payment, total amount paid, and total interest over the life of the loan.
Online Stopwatch
A precise stopwatch with lap timing — start, stop, record split times and reset, all running in your browser.
Pace Calculator
Convert running or walking time and distance into pace per kilometre and mile, or estimate finish time from a target pace.
Paint Calculator
Figure out exactly how many liters or gallons of paint you need for a room, accounting for multiple walls, doors, windows and coats.
Percentage Calculator
Find a percentage of a number, work out what percent one number is of another, or calculate percentage change — instantly.
Pomodoro Timer
Stay focused with timed work sessions and breaks — the classic Pomodoro Technique, running entirely in your browser.
Pregnancy Due Date Calculator
Estimate your baby's due date, current week of pregnancy, and trimester from the first day of your last period.
Profit Margin Calculator
Enter revenue and cost to instantly see your profit, margin percentage, and markup percentage side by side.
Random Number Generator
Generate one or many random integers within any range, with an option for unique-only results and cryptographically strong randomness.
Scientific Calculator
Solve trigonometry, logarithm, exponent and root problems instantly with a full scientific keypad — no app or spreadsheet required.
Sleep Cycle Calculator
Work out the best bedtime for a wake-up time, or the ideal wake-up time if you sleep now, using 90-minute sleep cycles.
Tile Calculator
Work out exactly how many floor or wall tiles you need, including a waste allowance for cuts and breakage.
Time Zone Converter
Convert a specific date and time between any two time zones, with full daylight saving awareness — perfect for scheduling cross-border calls.
Tip Calculator
Work out the tip amount, total bill, and per-person split for any restaurant bill, with quick-select tip percentages.
VAT Calculator
Add or remove VAT from any amount instantly — enter a price and rate to see net, VAT, and gross totals side by side.
Water Intake Calculator
Estimate how much water to drink each day based on your body weight, activity level and climate.
World Clock
See the current time, date and day of the week in major cities worldwide — updated live every second.