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CO2 Room Volume and Injection Estimate

Estimate an idealized gas-volume addition and average flow from room dimensions and a requested concentration rise.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

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A 4 × 5 × 3 m room is 60 m³. A rise from 400 to 1000 ppm needs approximately 0.036 m³ of CO₂, or 0.036 m³/hour over 60 minutes.

V_room = length × width × height; V_CO₂ ≈ V_room × (target ppm − current ppm)/10⁶; flow = V_CO₂/time.

Enter these known values and leave the other values blank.

This is a small-addition volume approximation at matching gas pressure and temperature. It assumes uniform mixing and ignores ventilation, leakage, uptake and displacement.
Current concentration must be positive, and target concentration must exceed it. The addition model excludes zero addition and cannot lower concentration.
Dimensions and time must be positive; time is displayed in minutes initially, while the default flow is m³/hour.
The estimate is not a CO₂ exposure limit or an operating instruction. Use independent concentration monitoring and the equipment safety protocol.

Ventilation, plant uptake, leakage and imperfect mixing are outside this volume model.

This tool models a positive addition only; target ppm must exceed the positive current value.

Declare the physical or stated approximation domain; captured arithmetic is unchanged.