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🔢 Prime Number Checker

Enter a number to check if it’s prime using a fast trial-division test.

Prime Number Checker

Check if a number is prime, see its divisors if it isn’t, and find the nearest prime numbers for quick reference.

Enter a number:

✅ Prime

Nearest primes: 89, 101

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Calculate your BMI using metric or imperial units. Instantly check if you are underweight, normal, overweight, or obese.

Enter your date of birth to calculate your exact age in years, months, and days. Quick, simple, and accurate.

Work out tips quickly and split bills between people. Enter amount, tip %, and people to see per-person cost.

Calculate UK VAT at 20%. Add VAT to a net price or remove VAT from a gross price instantly.

Calculate loan repayments, monthly interest, and amortization schedules. Useful for mortgages and personal loans.

Calculate compound interest on savings or investments. Choose compounding frequency and growth duration.

Calculate percentages easily. Find X% of Y, percentage increase or decrease, and reverse percentage problems.

Calculate the absolute change and percent change from one value to another.

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