Field calculators for the trades
Free, fast tools for HVAC techs, electricians and coating installers. Every number comes from published tables, and every tool has a phone app that works offline.
Free calculators
Superheat & subcooling calculator
R-454B, R-32, R-410A, R-22 with PT lookup.
HVACRefrigerant PT charts
22 refrigerants, bubble and dew columns.
ElectricalVoltage drop calculator
AWG or mm², copper or aluminum, minimum size for 3 %.
CoatingsEpoxy coverage calculator
Gallons and kits from area, mils and solids.
ElectricalWire size calculator
NEC 310.16 conductor and breaker, with voltage drop.
ElectricalAWG to mm² converter
AWG and kcmil to mm² and back.
PoolPool chemical calculator
Chlorine, baking soda, stabilizer and salt doses.
BakingBaker's percentage calculator
Sourdough flour, water, starter and salt.
SoapLye calculator
NaOH and water for cold process soap.
CountdownDays until Christmas
Live countdown to Christmas and New Year.
Apps for the trades
HVAC Charge: Superheat & PT
Superheat, subcooling and PT charts for R-454B, R-32, R-410A and more. Offline, no account.
Electrician Calc: Wire & Panel
Wire size, voltage drop, panel planner and 21 electrical calculators. NEC and IEC 60364.
CoatCalc: Epoxy Floor Coating
Epoxy and polyaspartic floor calculator: kits, flake, dew point and PDF quotes.
PoolPro: Chemistry & Route
Pool chemical calculator: exact doses for the products you own, CSI, a test log and a service route.
SoftWash Pro: Mix & Quote
Soft wash calculator: SH mix ratios, downstream strength, chemical cost and PDF quotes.
RoofCalc: Roofing Calculator
Roofing calculator: squares from the footprint and pitch, every material and PDF quotes.
SlabCalc: Concrete & Rebar
Concrete calculator: cubic yards and bags, rebar, mesh and forms on a feet-inch keypad. Pay once, no ads.
PaintBid: Painting Estimator
Painting estimator: rooms, gallons, labor hours and PDF quotes. Works offline.
SiteLog: Daily Report & Snags
Daily site reports and punch lists with photos. A PDF in one tap. Works offline.
Apps for makers
Everyday apps
Days Until: Countdown Widget
Countdown widgets for Christmas, trips, birthdays and weddings. Count up from any date, too.
Focus Sprint: ADHD Timer
An ADHD-friendly focus timer: tiny sprints, a kind buddy and a soft app shield. No guilt.
Water Buddy: Drink Reminder
A cute water tracker: fill up Buddy, hit your daily goal, unlock outfits and keep your streak.
Fastwise: Fasting Tracker
Intermittent fasting made simple: a plan that fits you, a live timer and help when hunger hits.
Leben in Deutschland: тест UA
Офіційні питання BAMF для тесту Leben in Deutschland з перекладом і поясненнями українською. Без реклами.
Why these tools
No account, no ads, no data leaving your phone. Built by an independent developer, Andrii Zhukovskyi, who answers every email: [email protected].
Most of the apps are in a free closed test on Google Play right now, with the App Store next. Become a tester and get them before release.