Free Online Calculators

Quick, accurate calculators for everyday use – percentage, loan & mortgage, tax/VAT, BMI, and age. No logins, no trials, no paywall.

✓ Free to use
✓ No sign-up or limits
✓ Fast, clean interface
✓ Built to stay paywall-free

What’s on this page?

• Percentage Calculator – “X% of Y”, “X is what % of Y?”, and “% change from A to B”.
• Loan / Mortgage Calculator – estimate monthly repayment, total repaid and total interest.
• Tax / VAT Calculator – add or remove tax at any rate.
• BMI Calculator – body mass index from height & weight.
• Age Calculator – age in years, months and days.

More calculators (savings, loan overpayments, BMI imperial, currency) will be added here as the NoPaywall.tools library grows.

Percentage Calculator

Everyday maths

X – percentage (%)

Y – base value

Result

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Example: “What is 20% of 150?” → 30.

Loan / Mortgage Repayment Calculator

Estimate only

Loan amount (e.g. 250000)

Interest rate (per year, %)

Term (years)

This is a simple repayment estimate using a standard amortisation formula. It doesn’t include fees, insurance, taxes, or rate changes.

Estimated monthly repayment

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Total repaid over term

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Total interest paid

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Use this as a rough guide only. For an exact figure tailored to your situation, speak to a lender or financial adviser.

Tax / VAT Calculator

Add or remove tax

Amount (e.g. 100)

Tax rate (%)

Mode

Add tax Remove tax

Use this as a simple tax/VAT calculator. It works with any rate – just enter the percentage and choose whether to add or remove it.

Tax amount

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Base price (without tax)

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Price including tax

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For example, with 20% VAT and base price 100, tax is 20 and total is 120.

BMI Calculator (Metric)

Health estimate

Weight (kg)

Height (cm)

This uses the standard Body Mass Index formula for adults in metric units. It’s just an indicator – not a diagnosis or medical advice.

Your BMI

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Category (approx.)

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Common BMI categories for adults:

< 18.5 – Underweight
18.5–24.9 – Normal weight
25–29.9 – Overweight
≥ 30 – Obese

Age Calculator

From date of birth

Date of birth

As of date (optional)

If left empty, today’s date is used.

This gives a simple calendar age in years, months, and days. Time zones and leap years are handled by your browser’s date functions.

Age

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Details

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About these free calculators

The goal of NoPaywall.tools is to provide simple, accurate calculators that solve everyday problems without forcing you through popups, trials, or “create an account to see your result” screens.

This page brings together some of the most commonly searched calculators – percentage, loan & mortgage, tax/VAT, BMI and age – with more on the way. All follow the same principle: fast, clean, and paywall-free.

None of these tools give financial, tax, or medical advice. They’re for quick estimates only – always speak to a professional for decisions that matter.