⚙️ Field Tools

Oilfield Calculators

Unit conversions and field decision tools built for the patch. No guesswork, no engineering degree required.

Unit Conversion Tools

Quick field conversions. Change any value and all others update instantly.

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Flow Rate

GPM • LPM • BPH • BPD • m³/hr

Gallons per Minute (GPM)

Liters per Minute (LPM)

Barrels per Hour (BPH)

Barrels per Day (BPD)

Cubic Meters per Hour (m³/hr)

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Pressure

PSI • bar • kPa • MPa • ft H₂O • m H₂O

PSI (lb/in²)

Bar

kPa (kilopascal)

MPa (megapascal)

Feet of Water (ft H₂O, SG=1)

Meters of Water (m H₂O, SG=1)

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Head & Depth

ft • m • in • mm • PSI equivalent

Feet (ft)

Meters (m)

Inches (in)

Millimeters (mm)

PSI equivalent (fresh water, SG=1)

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Power / Horsepower

HP • kW • W • BTU/hr • ft·lb/s

Horsepower (HP)

Kilowatts (kW)

Watts (W)

BTU per Hour (BTU/hr)

ft · lb/s

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Specific Gravity & API

SG • API gravity • lb/gal • kg/m³

Specific Gravity (SG)

API Gravity (°API)

Pounds per Gallon (lb/gal)

kg per m³ (kg/m³)

Field note: Water = SG 1.0, 10° API. Light crude = ~35–45° API (SG 0.80–0.86). Brine can be SG 1.1–1.3. Always confirm SG before sizing a pump.

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Temperature

°F • °C • Kelvin • Rankine

Fahrenheit (°F)

Celsius (°C)

Kelvin (K)

Rankine (R)

Field note: Viscosity drops with heat — hot oil is thinner. Pump efficiency and friction losses shift significantly above 150°F. Always use actual operating temperature when sizing.

Field Decision Calculators

Answer the questions that pump curves and spec sheets don\u2019t.

1. Pipe Size & Velocity Calculator

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Flow + Pipe ID → Velocity

Enter flow rate and pipe inside diameter to get velocity

Flow Rate

Flow Units

Pipe Inside Diameter

ID Units

Or select nominal pipe size (Sch 40)

Velocity guidelines: Suction lines ≤3 ft/s. Discharge 3–8 ft/s ideal. Above 10 ft/s risks erosion, noise, and major friction loss. Above 15 ft/s in steel pipe expect vibration and rapid wear.

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Target Velocity → Required Diameter

What pipe size do I need to hit a target velocity?

Flow Rate

Flow Units

Target Max Velocity (ft/s)

Line Type

Rule of thumb: Always size up to the next standard NPS. A pipe that\u2019s one size too small can cost more in friction losses over a season than the pipe upgrade ever would have.

2. Friction Loss Calculator

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Hazen-Williams Friction Loss

For water and water-like fluids (SG ≤ 1.1). Use Darcy-Weisbach for oils.

Flow Rate (GPM)

Pipe ID (inches)

Pipe C value

Total Pipe Run (ft)

Fluid SG

Equivalent Length: Fittings (add to total run)

90° elbows × —

45° elbows × —

Tees (branch) × —

Gate valves × —

Ball valves × —

Check valves × —

Why the pump underperforms: If the pump isn\u2019t delivering what the curve says, friction loss is usually to blame. A 3" steel hose run 500 ft at 350 GPM can eat 15–25 PSI before the fluid reaches the destination. Add your fittings — each 90° elbow on 3" pipe adds ~8 ft of equivalent head.

3. Total Dynamic Head (TDH) Calculator

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Total Dynamic Head

Translate your real piping system into a number you can use on a pump curve

Static lift / elevation head (ft)

Discharge elevation above pump (ft)

Suction condition

Suction lift or head (ft)

Total friction head loss (ft)

Discharge pressure requirement (PSI)

Fluid Specific Gravity (SG)

                        Static head component
                        —
                    
                        Suction component
                        —
                    
                        Friction component
                        —
                    
                        Discharge pressure component
                        —
                    
                        TDH (feet)
                        —
                    
                        TDH (meters)
                        —
                    
                        TDH equivalent (PSI)
                        —
                    
                        TDH equivalent (bar)
                        —

Pump curve shortcut: Plot this TDH value on the Y-axis of your pump curve at your target GPM. Where it intersects the curve is your actual operating point. If you\u2019re to the left of the BEP, your system resistance is too high.

4. Tank Volume & Fill Time Calculator

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Tank Volume & Fill/Empty Time

Rectangular, vertical cylinder, horizontal cylinder • gallons • barrels • liters

Tank type

Length (ft)

Width (ft)

Height / Depth (ft)

Fill level (% full)

Flow rate (GPM)

Quick check: A 500-bbl tank = 21,000 gal. At 350 GPM it fills in ~60 minutes. Always sanity-check your fill time before leaving a pump running unattended.

5. Pump Horsepower Estimator

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Pump Horsepower Estimator

Water HP → Brake HP → Motor HP recommendation

Flow Rate (GPM)

Total Dynamic Head (ft)

Specific Gravity (SG)

Pump efficiency (%)

Motor efficiency (%)

WHP = (GPM × Head × SG) / 3960

Sizing rule: Always select the next standard motor size above your calculated motor HP. Standard sizes: 1, 1.5, 2, 3, 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 100 HP. Running a motor above 80% of nameplate continuously is a reliability risk.