Free calculators that run in your browser

10 single-purpose tools, each built from one of our apps. The answer is on the first screen, nothing you type leaves your device, and they keep working offline once loaded.

• Free
• No account
• Works offline
• Data stays on this device

Farm

• Cost per egg calculator Feed price, how long a bag lasts and eggs a week → cost per egg and per dozen. From Eggonomics · community proposal
• How long will my hay last? Bales on hand, animals and daily intake → run-out date. From HayDays · community proposal

Home

• Propane tank days-left calculator Tank size, gauge reading and usage → days of gas left. From GasBook · community proposal
• Generator runtime calculator Fuel, load in watts and generator size → hours of power. From BackupHours · community proposal

Health

• Contraction timer (5-1-1) Time contractions and see when you hit 5-1-1. Works offline. From LaborClock · community proposal

Travel

• Schengen 90/180 calculator Days used, days left, and whether a future trip fits. From Ninety · community proposal

Work

• PDU, CPE and CEU converter Convert continuing-education hours between credit types. From CreditKeep · community proposal
• Tip pool calculator Split a tip pool by hours or points to the cent, with a printable close. From Poolfair · community proposal

Food

• Coffee to water ratio calculator Grams of coffee and water for any brew method and strength. From Pourover · community proposal

Games

• Board game score sheet Keep score for any game and any number of players. From Tableside · on the App Store

By the All Things AI team. Each tool page shows how the number is calculated, a worked example and the sources it follows. Spotted a wrong number? Email support@allthingsn.com.