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Free tools and calculators
Quick, free calculators for the questions our articles can't answer for you specifically. Calculate your weight across the solar system, your age on other planets, your dog's age in human years, and more. No signup, no email, just answers. Organized by topic.
Pets
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Dog years calculator
The accurate version — actual veterinary formula, not the lazy "multiply by 7" math everyone gets wrong.
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Pet lifetime cost calculator
What your pet will actually cost from adoption to old age. Most owners underestimate by thousands.
Space
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Weight on every planet calculator
See your weight on every planet in the solar system; plus the Moon, Pluto, and the Sun's crushing gravity.
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Black hole weight calculator
See what a black hole's gravity does to your weight and the tidal forces that would stretch you into spaghetti.
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Your age on other planets calculator
How old you'd be on Mercury, Mars, Jupiter, and beyond. Some surprises waiting on Neptune.
House & Home
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Home component lifespan calculator
Find out when your roof, HVAC, water heater, and appliances will need replacing, plus the estimated 10-year total.
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Lifetime home maintenance hours calculator
Find out how many hours of your life you'll spend maintaining your home. The number is bigger than you'd guess.
Why we built these
Answer Atlas exists to give you fast, factual answers to questions you'd otherwise spend twenty minutes piecing together from forums and outdated blog posts. Calculators are a natural extension of that; some questions only have a useful answer when you plug in your specific numbers.
Every tool here is free, requires no signup, and works without an email address. We don't track results, we don't sell data, and we don't show ads inside the tools themselves. Calculate what you need, get your answer, move on with your day.
If you have an idea for a calculator that should exist but doesn't, we'd genuinely like to hear it.
Got an idea for a calculator?
Drop us a line — the best tools on this page started as someone wondering "why isn't there a quick calculator for this?"