Beedy Academy
Free calculators for operators and engineers
221 field calculations, sorted by field: water, oil and gas, chemicals, pharma, mining, pulp and paper, steam, instrumentation and PID, electrical, pumps, heat, general chemistry, math and conversions, safety. Each one shows its formula and offers practice problems.
No calculator matches.
Water and wastewater
- Suspended solids (TSS / VSS)
- Sludge volume index (SVI)
- Total alkalinity (titration)
- Diluted sample
- Removal efficiency
- F/M ratio (food to microorganisms)
- Sludge age (SRT)
- Wasting rate for a target sludge age
- Hydraulic retention time (HRT)
- Return sludge ratio (RAS)
- Organic load
- Observed yield (sludge production)
- Oxygen uptake rate (OUR / SOUR)
- Nitrification: oxygen and alkalinity
- Flux and permeability (corrected to 20 °C)
- Chemical feed: mass and pump rate
- Alum for phosphorus removal
- Chlorination: dose, demand and CT
Oil, gas and refining
- API gravity, specific gravity and density
- Kinematic ↔ dynamic viscosity
- Blend viscosity (Refutas method)
- Two-product blend (density, sulfur)
- Vertical tank: volume from level
- Horizontal tank: partial volume
- Volume correction to 15 °C
- BS&W and net oil volume
- Flow conversion: bbl/d, m³/h, t/d
- Water cut and gas-oil ratio
- Horizontal separator: liquid retention time
- Gas flow at standard conditions
- Gas specific gravity from molar mass
- Pipeline: velocity, Reynolds number and throughput
- Fired heater: duty and efficiency
- Distillation cut yields and mass balance
- Used-oil re-refining: base-oil yield
Chemical and petrochemical processes
- Conversion, yield and selectivity
- Space time and conversion: CSTR and PFR
- Reactor volume for a target conversion
- Arrhenius: effect of temperature on rate
- Activation energy from two runs
- Batch cycle time and productivity
- Mixing two streams
- Diluting a strong acid or base
- Evaporator: water removal
- Process gas: density and actual flow
- Reaction heat and adiabatic temperature rise
- Jacketed reactor: cooling water and area
- Heating a batch: energy and steam
- Vapour pressure (Antoine equation)
- Relative volatility and K-values (Raoult)
- Minimum number of stages (Fenske)
- Minimum reflux (Underwood, binary)
Pharmaceutical and biotech
- F₀ of a sterilization hold
- Log reduction and SAL
- D-value from two counts
- z-value from two D-values
- MACO: dose criterion and 10 ppm
- Health-based MACO (PDE)
- Surface limit and swab limit
- Air changes and recovery time
- Serial dilution and plate count
- Concentration conversion
- Endotoxin limit and MVD
- Batch yield and reconciliation
- Line OEE
- Bioreactor oxygen transfer (OTR)
- Rotary tablet press output
Mining and mineral processing
- Percent solids from slurry density
- Slurry SG from percent solids
- Dry tonnage in a slurry line
- Dilution ratio and make-up water
- Reagent dose: g/t to solution flow
- Two-product formula: recovery and ratio of concentration
- Metal produced and concentrate tonnage
- Gold or silver production (g/t)
- Stripping ratio (waste to ore)
- Haul truck productivity
- Bond's law: grinding energy and power
- Mill critical speed
- Circulating load from percent solids (cyclones)
- Circulating load from a size fraction
- Thickener: underflow and recovered water
- Thickener: area, diameter and rise rate
- Tailings: storage volume and life
Pulp and paper
- Consistency of a sample
- Oven-dry tonnes from stock flow
- Dilution to a target consistency
- Tower retention time
- Specific refining energy
- Basis weight (grammage)
- Paper machine production
- First-pass retention
- Jet-to-wire ratio
- Water evaporated in the dryer section
- Pulping yield
- Chemical charge on oven-dry pulp
- Kappa number: lignin and ClO₂ charge
- White liquor: AA, EA, sulfidity
- Causticizing and reduction efficiency
Power, steam and utilities
- Boiler efficiency (input-output method)
- Steam flow for a heat duty
- Flash steam from condensate
- Boiler blowdown and cycles of concentration
- Condensate return and make-up water
- Cooling tower: range, approach, evaporation
- Cooling tower: cycles, blowdown and make-up
- Pump power
- Fuel energy (LHV and HHV)
- CO₂ from fuel burned
- Heat rate and thermal efficiency
- Compressed-air leak: flow and energy
- Leak test by load / unload timing
- Compressed-air receiver volume
Instrumentation and control
- 4–20 mA signal → engineering value
- Engineering value → 4–20 mA signal
- Flow from differential pressure (square root)
- Level from differential pressure
- Pt100 / Pt1000 RTD: resistance ↔ temperature
- Instrument accuracy: % of span vs % of reading
- Valve flow coefficient Cv / Kv (liquid)
- Kv ↔ Cv conversion
- Valve flow at a new pressure drop
- Orifice meter: flow at a new DP
- Ziegler–Nichols closed loop (Ku, Pu)
- Ziegler–Nichols open loop (reaction curve)
- Cohen–Coon (PI and PID)
- Lambda (IMC) tuning, self-regulating process
- Gain ↔ proportional band
- Integral action: min/repeat ↔ repeats/min
- Steady-state offset with P-only control
- First-order filter: response after t
Electrical
- Ohm's law and DC power
- Resistors in series and parallel
- Heating element: resistance and current
- Energy used (kWh)
- Battery / UPS runtime
- Single-phase power
- Three-phase power
- Power factor correction (capacitors)
- Transformer: full-load and short-circuit current
- Cable voltage drop
- Motor full-load current
- Synchronous speed and slip
- Motor starting current
- Variable speed drive: reduced power (affinity laws)
Pumps, pipes and tanks
- Pipe velocity
- Reynolds number (flow regime)
- Pipe pressure drop (Darcy-Weisbach)
- Minor losses (total K)
- Pressure and liquid head
- Hydraulic and shaft power
- Affinity laws (speed or impeller diameter)
- NPSH available and margin
- Pump and system operating point
- Pump flow by tank level test
- Vertical tank: level and volume
- Horizontal tank: partial volume
- Tank drain time through an orifice
- Fill or empty time
- Orifice plate flow
- DP flowmeter: square-root extraction
Heat transfer and energy
- Sensible heat
- Latent heat (steam, ice)
- Mixing temperature of two streams
- Energy to heat a tank
- Exchanger heat balance: outlet temperature
- LMTD and required area
- Effectiveness-NTU (counter-flow exchanger)
- Overall U (films and fouling)
- Conduction through a flat wall (2 layers)
- Heat loss from an insulated pipe
- Radiation between surfaces
- Tank cooling (Newton's law)
- Batch heating time (steam coil)
General chemistry
- Mass to moles
- Molarity and normality
- Making a solution: mass to weigh
- Dilution (C₁V₁ = C₂V₂)
- % w/w and density → mol/L
- mol/L and density → % w/w
- mg/L, ppm, mmol/L and meq/L
- Average molar mass of a mixture
- pH of a strong acid or base
- Buffer pH (Henderson-Hasselbalch)
- Titration: unknown concentration
- Water hardness as CaCO₃
- Ideal gas: PV = nRT
- Combined gas law
- Percent yield of a reaction
Math and unit conversions
- Pressure converter
- Flow rate converter
- Temperature converter
- Length converter
- Volume converter
- Mass converter
- Energy converter
- Power converter
- Rectangular basin (box)
- Cylindrical tank
- Cone and hopper (frustum)
- Sphere
- Level → volume (rectangular tank)
- Rule of three (proportion)
- Percent change and percent difference
- Weighted average (blending)
- Linear interpolation
- Mean and standard deviation
- Right triangle and slope (% ↔ degrees)
- Rounding to significant figures
Process safety and OHS
- LEL of a gas mixture (Le Chatelier)
- Confined space: ventilation purge time
- Oxygen after an inert gas release
- ppm ↔ mg/m³ conversion
- 8-hour time-weighted average (TWA)
- Mixture exposure (additive effects)
- Dilution ventilation for a solvent (ACGIH method)
- Adding sound levels (dB)
- Noise dose and 8-hour exposure level
- Sound level at another distance
- Stored energy of a pressurised gas vessel
- Fall arrest clearance required
Learning and checking tools. The ranges shown are general guidance: always follow your plant's procedures, permits and set points. Nothing is sent anywhere: the calculations run in your browser.