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QuickTool UA

20 free tools • 3 languages

Free online calculators and useful tools

Find the calculator, formatter, or validator you need, enter your values, and get a result without extra steps. No registration required.

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Popular tools

Quick access to tax, banking, loan, and JSON tasks.

VAT Calculator

Extract or add tax and get a clear result from the amount you enter.

IBAN Validator

Check the format and checksum of a Ukrainian IBAN before sending payment details.

Loan Calculator

Compare the payment, interest, and total cost using the terms you enter.

JSON Formatter

Format, minify, and check a JSON structure before you use it.

All tools by category

Choose a task and go straight to the tool that can help you complete it.

Finance & Taxes

Check amounts, tax rates, and bank details, or estimate loans and savings growth.

VAT Calculator

Extract or add VAT and compare the result with the amount you enter.

IBAN Validator (Ukraine)

Check an IBAN's format and checksum using the MOD-97 algorithm.

Loan Calculator

Estimate an annuity payment, total interest, and total loan cost.

Compound Interest

Estimate growth over time using a rate and recurring contributions.

Percentage Calculator

Find a share, a percentage of a number, or a discount in a few steps.

Amount in Words

Turn an amount into words for a document, receipt, or contract.

Markup and Margin Calculator

Selling price, profit, markup and margin from cost.

Discount Calculator

Discounted price, discount percentage and original price, including two discounts in a row.

Utilities

Plan dates, compare units, and create random values or passwords.

Body Mass Index

Get an approximate BMI from height and weight; it is not a medical diagnosis.

Date Difference

Find the interval between dates in days, weeks, and months.

Age Calculator

Calculate age precisely in years, months, and days from a date of birth.

Password Generator

Create a random password of the selected length directly in your browser.

Random Numbers

Choose numbers within a set range for a draw or a quick test.

Unit Converter

Convert length, weight, and data volume using standard coefficients.

Fuel Cost Calculator

How much fuel and money a trip needs and what your real consumption is.

Guides: formulas and tax rules explained

Detailed walkthroughs of the topics people look up in calculators most: how the formula works, which rates apply and how to verify the result.

How to calculate compound interest

Formula explained step by step, monthly and annual capitalisation, a worked example and comparison with simple interest.

Compound Interest Calculator →

How to calculate VAT in Ukraine

All 2026 rates, charging and extracting VAT, the 21,000 UAH base, a worked example for a sole proprietor.

VAT Calculator →

Annuity payment: how to calculate

Why payments stay equal, how the overpayment depends on rate and term, comparison with a declining schedule.

Loan Calculator →

When to use these tools

Start with a specific task — the result appears as soon as you enter your values.

Before a financial transaction

Check a calculation, compare interest, or confirm that a number has the correct format.

When working with data

Format JSON, transform text, or inspect a structure before sharing it.

For everyday tasks

Count days, convert units, or prepare a set of random values.

Privacy and limitations

Tools that run locally process the values you enter in your browser and do not require an account. Do not enter confidential data unless you are authorized to use it.

Results depend on your values and the formulas used. We do not claim constant updates to rates, tax rules, banking, market, or medical data: check important information against current official sources.

Algorithms and automated results do not replace professional, financial, legal, or medical advice and do not guarantee transaction approval or regulatory compliance.

Which calculator to pick

Six common tasks — and the right tool for each.

Check VAT before filing a report Charge and extract tax at three rates — 20%, 14% and 7% — using the 21,000 UAH base for 2026. Compare two loan offers Annuity and declining schedules: monthly payment, total interest and the full amount for two scenarios. Estimate the yield on savings Compound interest with monthly capitalisation, term and rate — you immediately see what a deposit returns in a year. Write an amount into a contract In digits and in words — hryvnia, kopecks, dollars and euros, with correct grammar in Ukrainian and Russian. Verify payment details before sending IBAN by check digits and account structure — before you send the transfer to the bank. Work out a discounted price Discount as a percentage or a fixed amount, reverse calculation from the final price and comparison of two options.

Frequently asked questions

Do I need an account?

No. The tools are free, require no registration, and are designed to work in a modern browser.

How is entered data handled?

Tools that run locally process values in your browser and do not send them to a server. Do not enter data you are not authorized to use, and consider the risks of browser extensions and the device itself.

How much can I rely on the results?

Results depend on the values you enter and the formula used. We do not claim constant updates to rates, tax rules, banking, or medical data. Check important decisions against current official sources.

Does IBAN validation confirm that an account exists?

No. The tool checks the format and MOD-97 checksum, but it does not confirm that an account exists or that funds belong to the person checking it.

Which languages are available?

The main interface and tool pages are available in Russian, Ukrainian, and English. You can switch languages in the site header.

Do the tools work offline?

Yes. Every calculation runs in JavaScript inside the browser — the page loads once and then works without a network connection. Nothing is uploaded: not your text, not the numbers, not the payment details you enter.

Which calculations are most needed in Ukraine?

Tax and credit calculations first: VAT at three rates, the unified contribution, annuity loan payments and compound interest on a deposit. Rates reflect 2026, but always double-check against current figures on the tax service website before filing.

How is this different from the calculator in my phone?

It works with ready-made formulas rather than individual operations. In the loan calculator you enter an amount, a rate and a term, and get a full payment schedule, the total interest and the overall amount — not a single number.

Can I use the result in a contract or a report?

Yes. The calculations follow standard formulas and you can copy the result. But responsibility for the figures in a document always stays with the document owner: check the result against the source and keep the calculation date.

How do I bookmark the site?

Press Ctrl+D in the browser (Cmd+D on Mac). The pages are light and open instantly, so it is convenient to keep them in a separate folder and open them with one click before a task.

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