Free Everyday Calculators
Dates and durations, running costs, home projects and shopping maths — the small calculations that are easy to get slightly wrong.
46 free tools · no signup
Add and Subtract Time Calculator
Add or subtract hours, minutes and seconds from any time and get the exact result.
Bill Split Calculator
Split a restaurant or group bill evenly or unevenly, with tip and tax, down to the exact penny.
Business Days Calculator
Count business days between two dates or add/subtract workdays, excluding weekends and holidays.
Carpet Calculator
Find square yards of carpet, roll length, and cost including underlay for any number of rooms.
Coffee Cost Calculator
Compare coffee shop spending to home-brew cost and see what the savings could grow into.
Commute Cost Calculator
See your daily, weekly, monthly & yearly commute cost, plus WFH savings and time spent.
Countdown Timer
Live countdown to any date/time plus a simple minutes timer with a completion beep.
Date Difference Calculator
Find the exact time between two dates in days, weeks, months and years.
Day of the Week Calculator
Find the day of the week for any date, plus the week number and days from today.
Days Until Date Calculator
Count the exact days, weeks, months, and business days until (or since) any date, with a live countdown.
EV Charging Cost Calculator
Estimate EV charging cost per mile and per 100 miles, and compare home vs. public rates to gas.
Fuel Cost Calculator
Calculate total trip fuel cost, cost per mile or km, and cost per passenger using MPG or L/100km.
Gift Budget Calculator
Split a total gift budget fairly across recipients by priority, with live running totals.
Interview Question Prep
Practise the questions you will actually be asked and draft STAR answers you can defend.
Job Offer Comparison Calculator
Compare up to three job offers on total compensation, hours and commute, not just base salary.
Leap Year Calculator
Check whether any year is a leap year and see the next and previous leap years instantly.
Meeting Cost Calculator
See what a meeting costs in staff time, and what it costs across a year if it recurs.
Moving Cost Calculator
Estimate DIY truck rental vs. professional movers with packing, storage, and insurance.
Mulch Calculator
Find how many bags or cubic yards of mulch you need for any number of garden beds.
Party Food Calculator
Get food, drink, and ice quantities plus estimated cost for any party size or event type.
Printing Cost Calculator
Work out your real cost per page from ink, toner, paper and coverage, then annualise it.
Reading Time Calculator
Estimate how long any text takes to read or speak, by word count and reading speed.
Screen Time Cost Calculator
Convert daily screen time into hours, full days and years of your life over any period.
Shipping Cost Per Item Calculator
Split freight, duty and packaging across a shipment to find the true cost of each item.
Time Card Calculator
Turn daily clock-in/out times and breaks into weekly hours, overtime, and gross pay.
Time Duration Calculator
Work out the exact duration between two times, with breaks deducted and overnight shifts handled.
Unit Price Comparison Calculator
Compare pack sizes and prices in mixed units to find which one is genuinely the best value.
Wall Area Calculator
Get total wall area, ceiling area, and perimeter for any room, minus doors and windows.
Wallpaper Calculator
Find how many wallpaper rolls you need, factoring in pattern repeat and match type.
Water Usage Calculator
Estimate your household's daily, monthly and yearly water use and cost from showers, baths, laundry and more.
Wedding Budget Calculator
Split a total wedding budget across venue, catering, photography, and more.
Work Hours Calculator
Find hours between two dates, add/subtract durations, and convert decimal hours to h:m.
⌨️ Typing Speed Test
Measure your typing speed (WPM) and accuracy live, with a new sentence each run.
⚡ Electricity Bill Calculator
Add your appliances and see your estimated daily, monthly, and yearly electricity cost.
🍕 Pizza Size Comparison
Compare up to 4 pizzas by diameter and price to find the true best value.
🎂 Age Calculator
Find your exact age in years, months & days from your date of birth — free & private.
🎡 Random Picker Wheel
Paste a list and spin to pick a fair random winner — for giveaways, chores, and teams.
🎨 Paint Calculator
Calculate how many gallons or litres of paint you need for any room, plus total cost.
🎲 Dice Roller
Roll 1-10 dice of any type with modifiers, totals, history, and a live distribution.
📅 Week Number Calculator
Find the ISO and US week number for any date, plus day-of-year and reverse week lookup.
📱 QR Code Generator
Free custom QR code generator — links, text, Wi-Fi & contacts, download PNG.
🔲 Tile Calculator
Find tiles needed, boxes needed, and total cost for any floor or wall tile project.
🚗 Road Trip Cost Calculator
Estimate total road trip cost — fuel, lodging, food, tolls — and the per-person split.
🧱 Concrete Calculator
Get cubic yards, cubic metres, bags needed, and cost for slabs, footings, and columns.
🪙 Coin Flip Simulator
Flip 1 to 1,000 coins and see counts, percentages, streaks, and history live.
🪵 Flooring Calculator
Add multiple rooms and calculate boxes of laminate, hardwood, or vinyl flooring needed plus cost.
Dates are harder than they look
Leap years are not simply every four years: century years are skipped unless divisible by 400, which is why 1900 was not a leap year and 2000 was. Working days depend on which days you count. A duration across midnight is not a subtraction. The date and time tools here implement the full rules and explain them, rather than the approximation that works until it does not.
Running costs add up quietly
Fuel, electricity, commuting, coffee and subscriptions are individually trivial and collectively significant. These calculators annualise the small number, which is usually the point at which the figure becomes interesting.
The shopping maths that shops rely on
A bigger pack is not automatically cheaper per unit, and pack sizes are frequently chosen so the comparison is awkward to do in your head. The unit-price comparison tool normalises mixed units — grams against kilograms, millilitres against litres — and names the genuinely cheapest option.
