11 free money calculators: gas bill, cash envelopes, invest vs pay off debt, 401(k), HSA, tip pooling, cleaning quotes, food cost and surcharges. This guide is part of the Dixon App Studio blog — practical, no-fluff articles for builders, freelancers, home cooks, and sports fans. Read more guides on the blog index, browse our full app lineup, or use one of our free online converters whenever you need a quick answer.
Yes. They run in the browser with no account and no download. Your numbers stay on your device.
$24,500 in employee deferrals, plus an $8,000 catch-up at 50 and over ($32,500 in total), per IRS Notice 2025-67. The 401(k) calculator shows the percentage of pay that reaches it.
In the US, no more than your cost of acceptance and no more than the card network's cap (3% for Visa), on credit cards only. Some states restrict surcharging, so check local rules first.
Every product on this site is built and maintained in-house by Dixon App Studio. We focus on speed, clarity, and longevity instead of chasing trends or paywalling features. If you need help with any of our apps, our support page lists contact details and answers to the most common questions.