Online fire protection calculators
Preliminary calculators based on TCVN 7336:2021, QCVN 06:2022/BXD and QCVN 10:2025/BCA. Every result states the formula and source so an engineer can check it.
Who are you? Start here
Pick your role to see which tools to open first.
Owner, factory investor
Not sure what to install, which procedures apply, or what the fines are.
- For owners
- Required fire equipment Coming soon
- External fire water
- Standards
Fire protection designer
Size sprinklers, hose reels, tanks and pumps with code clauses for the design report.
- Required fire equipment Coming soon
- Sprinkler
- External fire water
- Pipe friction loss
- Standards
HVAC engineer
Smoke extraction, stair pressurization, ventilation and energy codes.
MEP contractor, installer
Quick pipe sizes, head pressure, test pressure, hangers on site.
TCVN 7336:2021
SprinklerFlow, head pressure, tank volume, pump and number of heads by hazard group.Open calculator QCVN 06:2022
Outdoor fire water supplyEnter fire resistance, hazard class and length × width × height; get flow in L/s and 3-hour water volume.Open calculator Hazen-Williams
Pipe loss & sizingCompare DN25–DN150 by velocity and Hazen-Williams loss and get a recommended size.Open calculator BS 1387 · ASTM A53
Steel pipe sizesDN ↔ inch ↔ OD, wall, ID and kg/m of steel pipe.Open calculator QCVN 06:2022
Indoor hydrantsNumber of jets, flow per jet, nozzle pressureOpen calculator TCVN 7336 · QCVN 02:2020
Water tank + pumpsTotal tank volume, pump headOpen calculator TCVN 5738:2021
Fire alarmDetectors, zones, call points, bellsOpen calculator QCVN 06:2022
Corridor smoke exhaustSmoke flow, number of extract openingsOpen calculator QCVN 06:2022
Room smoke exhaustBy fire perimeterOpen calculator QCVN 06:2022
Stair pressurizationClosed doors 20–50 Pa, open door 1.3 m/sOpen calculator QCVN 06:2022
Fire load densityClass C1–C4 by MJ/m²Open calculator QCVN 06:2022
Building hazard classA–E by room class and areaOpen calculator TCVN 7435-1
ExtinguishersUnits by area and travel distanceOpen calculator Q = K√P
Sprinkler K-factorQ = K√P, flow ↔ pressureOpen calculator Pitot · 1,4 bar
Hydrant flow testPitot, converted to 1.4 bar residualOpen calculator V = πd²L/4
Water volume in pipesDry systems, drain, pressure testOpen calculator TCVN 7336:2021
Sprinkler temperature ratingBy ceiling temperature, bulb colourOpen calculator TCVN 7336:2021
Acceptance test pressureHydrostatic, dry-system air testOpen calculator NFPA 13
Sprinkler obstructionsThree-times rule, distance to beamsOpen calculator TCVN 7336 · NFPA 13
Pipe hangersMaximum spacing, number of hangersOpen calculator Coming soon
Required fire equipmentWhat to install, is design appraisal required
High-rack storageIn-rack sprinklers, storage height