Free Calculators for Tradesmen
Quick, accurate on-site calculators. No app to install. Referenced to the standards you actually work to — BS 7671 for electrical and Gas Safe technical bulletins for gas.
Gas
Gas Rate Calculator
Convert meter readings to m³/hr and kW for natural gas or LPG.
Electrical
Zs Calculator (Ze + R1+R2)
Compute earth fault loop impedance from Ze and R1+R2.
Electrical
Prospective Fault Current (Ipf)
Calculate prospective fault current from voltage and Zs.
Electrical
RCD Trip Time Check
Verify measured RCD trip times pass BS EN 61008 limits.
Electrical
Voltage Drop Calculator
Calculate cable voltage drop for T&E single-phase circuits.
More calculators coming. Browse certificates while you're here.