Oilfield calculators made simple
Rig Math
Fast, mobile-friendly drilling and field calculators built for everyday rig use. Simple inputs. Clear answers. No clutter.
Calculators
Current calculators are listed in alphabetical order.
Annular Capacity
Find bbl/ft between hole size and pipe OD.
→Find bbl/ft between hole size and pipe OD.
Annular PSI Loss + ECD
Calculate annular velocity, PSI loss, ECD, hydrostatic PSI, and EMW.
→Calculate annular velocity, PSI loss, ECD, hydrostatic PSI, and EMW.
Annular Velocity
Calculate annular velocity from flow rate, hole size, and pipe OD.
→Calculate annular velocity from flow rate, hole size, and pipe OD.
Bottoms Up Strokes
Calculate strokes required to circulate bottoms up.
→Calculate strokes required to circulate bottoms up.
Bottoms Up Time
Calculate minutes to circulate bottoms up.
→Calculate minutes to circulate bottoms up.
Cement Volume
Calculate cement volume in open hole annulus.
→Calculate cement volume in open hole annulus.
Equivalent Mud Weight
Convert PSI over TVD into EMW.
→Convert PSI over TVD into EMW.
Hydrostatic PSI
Calculate hydrostatic pressure from mud weight and TVD.
→Calculate hydrostatic pressure from mud weight and TVD.
Pipe Capacity
Calculate pipe internal capacity in bbl/ft.
→Calculate pipe internal capacity in bbl/ft.
Pump Efficiency
Compare actual output to theoretical output.
→Compare actual output to theoretical output.
Pump Output
Calculate triplex pump output in bbl/stroke.
→Calculate triplex pump output in bbl/stroke.
Strokes to Barrels
Convert pump strokes into barrels.
→Convert pump strokes into barrels.
Built for phones
Large inputs, simple layout, and quick results for field use.
Clean formulas
Each calculator shows the basic formula so it is easy to check.
Expandable
Add more rig calculators as the website grows.