Calculation tools · 95 in the index
Pharmacy calculations,worked out.
Every calculator for the Pharm-D syllabus, grouped by the subject you meet it in — from C₁V₁ = C₂V₂ to Child-Pugh. Free, no account needed, and each one also ships in the offline Android app.
New here? How to use the calculators
Educational use only. Built for study and reference — not for making clinical decisions.
95calculators in this index
10syllabus subjects they are grouped under
01 · Subject
Pharmaceutical Chemistry
Solution prep, concentration & chemical analysis tools
16 tools
- Molarity CalculatorMolarity from mass, MW and volume, or amount needed for a target M
- Mass–Molarity CalculatorMolarity from solute mass, molar mass and final volume, with moles
- mg/mL ↔ Molarity CalculatorConverts mg/mL to molarity in M, mM and µM using molecular weight
- Normality CalculatorNormality via equivalent weight (MW ÷ n-factor), or amount for a target N
- Percentage Solution Calculator (w/v, w/w, v/v)Solves % w/v, v/v or w/w for the percentage, solute, solvent or total
- ppm / ppb Calculatorppm, ppb, mg/L or M from solute mass and volume, or unit-to-unit conversion
- Dilution Calculator (C₁V₁ = C₂V₂)C₁V₁ = C₂V₂ for any missing term, plus diluent volume and dilution factor
- Serial Dilution CalculatorSimple, serial, stepwise and reverse dilution plans with tube volumes
- Theoretical Yield CalculatorTheoretical yield from the limiting reactant, simple or full stoichiometry
- Percentage Yield CalculatorPercentage yield = actual ÷ theoretical yield × 100, mixed mg/g/kg units
- Molecular Weight FinderMolar mass and % composition by element from a chemical formula
- Solubility CalculatorSolubility from normality and gram equivalent weight, S = N × G.W ÷ 10
- Heat of Formation CalculatorEnthalpy of solution by van't Hoff from solubilities at two temperatures
- pH–pKa Calculator (Henderson–Hasselbalch)Henderson–Hasselbalch: solve pH, pKa or [A⁻]/[HA], with ionised fractions
- Combined pKa SuiteKa ↔ pKa, % ionised at a given pH, and weak-acid pH = ½(pKa − log C)
- Heat Of Neutralization CalculatorHeat released q = m·c·ΔT from a calorimetry run, with optional ΔH per mole
02 · Subject
Unit Conversion
Convert between pharmaceutical units: mass, volume, concentration
6 tools
- Mass Conversion CalculatorConverts mass between mcg, mg, g, kg, oz and lb, showing every unit
- Volume Conversion CalculatorConverts volume between µL, mL, L, m³ and household tsp, tbsp, fl oz, gal
- mmol ↔ mEq ↔ mg Calculatormg ↔ mmol ↔ mEq for Na, K, Ca, Mg, Cl, HCO₃ and PO₄ via MW and valence
- Temperature Conversion Calculator°C, °F and K conversion, flagged against medicine-storage temperature bands
- Strength Conversion CalculatorConverts strengths between %, ratio (1:X), w/v, w/w and v/v
- Weight/Volume Conversion Calculator (Density-Based)Mass ↔ volume of a liquid from its density, with common vehicle presets
03 · Subject
Pharmaceutics
Formulation, powder, dissolution and dosage form calculations
18 tools
- Powder Flowability CalculatorCarr's index and Hausner ratio from bulk and tapped density, flow class
- Surface Area–Particle Size CalculatorD10, D50, D90, span and specific surface area from sieve or laser data
- Compressibility Index CalculatorCarr's index, Hausner ratio and bulk/tapped density from cylinder volumes
- Porosity CalculatorPorosity ε from true and bulk density, or from total and solid volume
- Density CalculatorTrue, bulk or tapped density = mass ÷ volume, with container correction
- Density & Relative Density Bottle CalculatorRelative density (W₃ − W₁)/(W₂ − W₁) and density by pycnometer weighings
- Tablet Dissolution Profile PlotterPlots % disintegrated/dissolved vs time; T50, T90 and full disintegration
- Content Uniformity CalculatorUSP ⟨905⟩ acceptance value, mean, SD and RSD from 10 unit assays
- Osmolarity CalculatorΣ(C × i) osmolarity plus serum, plasma, IV fluid, TPN and buffer modes
- Osmolality CalculatorΣ(C × i) osmolality plus serum, urine (incl. SG), plasma and blood modes
- Isotonicity CalculatorNaCl-equivalent (E-value) method: tonicity and NaCl to add per 100 mL
- Sterile Dose Volume CalculatorInjection volume to draw = dose ÷ concentration, with syringe guidance
- Drug–Excipient Compatibility PredictorRule-based risk score for chosen drug groups, excipients and conditions
- Master Formula CalculatorScales every ingredient of a master formula to a desired batch size
- Dissolution CalculatorAbsorbance → concentration → corrected concentration → % drug release over time
- Cumulative Drug Release CalculatorCumulative drug amount and % release, corrected for sample withdrawal
- Dissolution Rate Constant CalculatorMidpoint, dC/dt, Cs − C and both k columns from a dissolution practical
- Drug Stability Kinetics CalculatorOrder, k, half-life and t90 from a Time vs Absorbance stability practical
04 · Subject
Biopharmaceutics & Pharmacokinetics
ADME parameters, half-life, clearance and kinetics tools
14 tools
- Half-Life Calculatort½ from kₑ, from CL and Vd, or from two concentrations over time
- Ke CalculatorElimination rate constant kₑ from t½, from CL and Vd, or from dose and C₀
- Clearance CalculatorClearance from dose ÷ AUC, or infusion rate ÷ steady-state concentration
- Volume of Distribution CalculatorApparent Vd = dose ÷ C₀, in L and L/kg with distribution band
- AUC EstimatorAUC by linear trapezoidal rule with extrapolation to ∞, or F·dose ÷ CL
- Bioavailability CalculatorRelative/absolute F = (AUCtest/Dosetest) ÷ (AUCref/Doseref) × 100
- Loading Dose CalculatorLoading dose = Cₚ × Vd ÷ F by route, total and per kg
- Maintenance Dose CalculatorMaintenance dose = Css × CL × τ ÷ F, with accumulation and peak/trough
- First-Order vs Zero-Order Kinetics ToolPlots first-order, zero-order and Michaelis–Menten elimination curves
- Bioequivalence Calculator90% CI of test/reference AUC and Cmax ratios against the 80–125% limits
- Accumulation Index CalculatorAccumulation ratio R = 1 ÷ (1 − e^(−kτ)) from half-life and dosing interval
- Mean Residence Time CalculatorMean residence time = AUMC ÷ AUC, or 1.44 × t½ for a one-compartment drug
- Dialysis Membrane / Diffusion CalculatorC₂/C₁, B and ln(1 − B) vs time, with slope and rate constant
- Partition / Distribution Coefficient CalculatorD, log D, [H⁺] and 1/[H⁺] across pH groups, with graphs
05 · Subject
Pharmacology
Drug-receptor interactions, dose-response and safety margins
6 tools
- Animal Weight-Based Dose CalculatorAnimal dose scaled linearly by body weight, plus injection volume
- Serial Dose CalculatorDilution chain from a dissolved tablet to deliver a tiny animal dose volume
- Drug–Receptor Binding Affinity ToolReceptor occupancy from Kd/Ki, IC50 → Ki by Cheng–Prusoff, binding plots
- Therapeutic Index CalculatorTherapeutic index = TD50 ÷ ED50 with a safety-margin band
- Dose–Response Curve GeneratorPlots sigmoid Emax (Hill) curves for several drugs, linear and log scale
- ED50 / TD50 / LD50 CalculatorProbit regression (Finney) on dose–mortality data for LD50 with 95% CI
06 · Subject
Pharmaceutical Analysis
Spectroscopy, chromatography, purity and assay calculations
10 tools
- Beer-Lambert Law CalculatorBeer–Lambert A = εbc, solved for absorbance, concentration or ε, with %T
- UV-Vis Peak AnalyzerA260/A280 nucleic-acid purity ratio and molar absorptivity from a peak
- UV-Vis Spectrum PlotterPlots a UV-Vis spectrum with λmax and peaks, or fits a calibration line
- Chromatographic Resolution CalculatorResolution Rs from retention times and widths, or Purnell (N, k, α)
- TLC Rf AnalyzerRf values from a TLC plate photo, on-device, or from measured distances
- Percent Purity CalculatorTitrimetric assay: % purity = V × N × E × D × 100 ÷ W, vs 98–102% limit
- Percentage Recovery Calculator% recovery from initial and recovered amounts, or from C × V of each
- Ash Value CalculatorTotal, acid-insoluble or sulfated ash % = (W₃ − W₁) ÷ W₂ × 100
- Calibration Curve CalculatorLeast-squares line: slope, intercept, R² and an unknown's concentration
- Accuracy & % Recovery Calculator% recovery, % error, and mean, SD and %RSD across replicate trials
07 · Subject
Physiology
Hemocytometry and blood-cell counting for the physiology lab
2 tools
08 · Subject
Microbiology
Microbial quantification, sterilization and antimicrobial testing
6 tools
- Colony Counter & CFU CalculatorCounts colonies in a plate photo on-device; CFU/mL from the verified count
- Sterilization CalculatorF₀ = t × 10^((T − Tref)/z) for a hold at constant temperature
- Zone of Inhibition CalculatorClasses a disk-diffusion zone diameter as S, I or R by fixed cut-offs
- D-Value CalculatorD-value = exposure time ÷ log(N₀/N) from survivor counts
- F-Value CalculatorF = D × log reduction, and F₀ equivalent minutes at 121 °C via z-value
- Log Reduction CalculatorLog reduction log₁₀(N₀/N) and percent kill from before/after counts
09 · Subject
Pharmaceutical Engineering
Industrial processes, heat transfer and scale-up calculations
4 tools
- Heat Transfer Area CalculatorHeat-exchanger area A = Q ÷ (U × ΔT), with an area-vs-U chart
- Reynolds Number CalculatorReynolds number ρvD/μ with flow regime and Darcy friction factor
- Drying Rate CalculatorDrying rate per m² and water removed from moisture content, time and area
- Mixing Time EstimatorImpeller Reynolds number, power number and mixing time from tank geometry
10 · Subject
Clinical & Hospital Pharmacy
Patient-specific dosing, renal/hepatic adjustments and clinical tools
13 tools
- BSA CalculatorBody surface area by Mosteller, DuBois, Haycock, Gehan–George or Boyd
- BMI CalculatorBMI with WHO/Asian bands, plus ideal, adjusted and lean body weight
- Pediatric Dose CalculatorChild dose by mg/kg, compared with Young's, Clark's and Fried's rules
- IV Drip Rate CalculatorDrip rate (gtt/min) = volume × drop factor ÷ minutes, plus mL/h
- Creatinine CalculatorCrCl by Cockcroft–Gault (actual/IBW/AdjBW) plus CKD-EPI 2021 eGFR
- GFR CalculatoreGFR by CKD-EPI 2021 (race-free) or MDRD, with KDIGO G and A staging
- Child-Pugh CalculatorChild-Pugh score and class A/B/C from 5 criteria, optional MELD-Na
- QT Interval CalculatorQTc by Fridericia, Bazett, Framingham or Hodges, with QRS adjustment
- Anticoagulation Risk CalculatorCHA₂DS₂-VASc stroke and HAS-BLED bleeding scores, plus DOAC dosing
- Corrected Calcium CalculatorAlbumin-corrected calcium = Ca + 0.8 × (4 − albumin)
- Sodium Correction CalculatorGlucose-corrected sodium = Na + 0.016 × (glucose − 100)
- Anion Gap CalculatorAnion gap = Na⁺ − (Cl⁻ + HCO₃⁻), optional albumin correction
- Insulin Sensitivity CalculatorISF (1500–2200 rule), carb ratio (300–500 rule) and meal/correction bolus
Android app
The whole index, in your lab coat pocket.
The PharmaWallah app carries these calculators and runs them with no signal — in the lab or on the ward.