About LazySums

LazySums is a small set of everyday calculators that do one thing well: give you a plain, exact answer without making you sign up, scroll past clutter or second-guess the maths.

How we keep it simple

• Only straight maths. Every calculator has one correct answer. We avoid anything that depends on changing laws or local rules.
• The working is always there. Open “Show the working” under any answer to see each step.
• Nothing to create. No accounts and no logins. Calculations happen in your browser.

Spotted a mistake?

If an answer looks wrong, we want to know. Email hello@lazysums.com with the calculator and the numbers you entered.