Money and shopping
Compare discounts and coupons, calculate VAT, or split a bill with per-person rounding.
Calculate anything.
Nine fast, free calculators for everyday numbers, money and dates. No account, no loading maze, no unnecessary AI.
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Percentage Calculator
Find percentages, ratios and percentage change instantly.
🎂
Age Calculator
Exact age, Korean age conventions and next birthday countdown.
🏷️
Discount Calculator
Stack discounts and coupons and see your effective savings.
📅
Date Calculator
Dates, D-day and business days with custom holidays.
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Average Calculator
Mean, median, mode and population or sample standard deviation.
💸
Tip Calculator
Tips, bill splitting and per-person rounding.
⏱️
Time Calculator
Work hours, breaks, overnight shifts and time arithmetic.
⚖️
Ratio Calculator
Simplify, split totals or solve a missing proportion.
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VAT Calculator
Supply price, VAT and total, before or including tax.
Simple by design
Everyday calculations without the setup
Choose a calculator, enter your values and get a result with the formula. No account or app install required.
Dates and work hours
Find your age on a reference date, count down to an event, calculate business days or deduct breaks from a shift.
Numbers and statistics
Find percentages, calculate mean and standard deviation, simplify ratios or solve a missing proportion.
Questions
Every Tiny Tool · Calculate FAQ
Is Every Tiny Tool · Calculate free?
Yes. All nine current calculators are free to use without creating an account.
Do I need to install an app?
No. Open a calculator in your browser on desktop or mobile, enter your values and select Calculate.
Which calculators are available?
You can calculate percentages, age, discounts, dates, averages and statistics, tips and bill splits, time, ratios and VAT.
Can I check how a result was calculated?
Yes. Each calculator displays its calculation formula below the result. Date and age calculations also explain the counting conventions used.
Does the business-day calculator automatically exclude public holidays?
No. It can exclude Saturdays and Sundays, and you can enter custom holiday dates. Public holidays are not loaded automatically; holidays that overlap with excluded weekends are not subtracted twice.
Can I use it for work, shopping or studying?
Yes. Calculate work hours after breaks, compare sequential discounts, split a bill, find a date interval or check statistics. For official or high-stakes decisions, verify the inputs, rounding and applicable rules independently.