Free tools
No signup, no paywall - genuinely useful calculators for students in any major, from pre-med and engineering to business and art/design, plus nursing, NCLEX-RN and medical assistant (CCMA) study aids and licensing-exam math for insurance, pharmacy technician and real estate candidates, built by the Encodr team.
Enter your exam date, hours needed, and difficulty to see how much less time targeted review actually takes.
Open tool →See the Ebbinghaus forgetting curve for cramming vs. spaced review, and where each review session resets your retention.
Open tool →Enter a course, its credit hours, and how memorization-heavy it is to get a recommended daily and weekly study load.
Open tool →Enter your current grade, the final's weight, and your target grade to see the exact score you need on the final.
Open tool →Calculate your unweighted and weighted GPA (honors +0.5, AP/IB +1.0) side by side - not just pre-med, works for any transcript.
Open tool →Enter total questions and the passing percentage to see exactly how many you can miss and still pass.
Open tool →Enter deck size and your new-cards-per-day pace to see when first exposure finishes and your steady-state daily review load.
Open tool →Enter your grading categories and their weights to see your current overall grade, even with categories still outstanding.
Open tool →Convert instantly between letter grades, percentages, and 4.0-scale GPA points.
Open tool →Enter your participation, case write-up, project, and exam weights to see your current grade in a case-method business course.
Open tool →Score your own work against a weighted studio rubric - concept, execution, craft, presentation, and reflection - before a critique or portfolio review.
Open tool →Enter one source once and get correctly formatted citations in APA, MLA, and Chicago side by side, for books, websites, and journal articles.
Open tool →Enter total pages, days available, and how dense the reading is to see how many pages a night it actually takes to keep up.
Open tool →A free, no-signup Pomodoro timer with customizable work and break lengths and a running count of completed sessions.
Open tool →Enter your total credit hours this term to see the weekly study time the standard "2-3 hours per credit hour" rule recommends.
Open tool →Enter your current GPA, credits earned, target GPA, and credits this semester to see the exact GPA you need this term.
Open tool →Free z-score calculator: z-score and percentile from a raw score, or a score from a z-score or percentile, with the 68-95-99.7 rule.
Open tool →Log your practice tests - score, breakdown, conditions, date - and get a weighted prediction of your real MCAT score.
Open tool →Calculate your cumulative GPA and BCPM science GPA on the AMCAS 4.0 scale.
Open tool →Enter passages completed and minutes elapsed to see your current pace and whether you are on track to finish the CARS section on time.
Open tool →Calculate IV flow rate in mL/hr, drip rate in gtt/min for any drop factor, and infusion time, with the working shown.
Open tool →Add eye, verbal and motor responses into a Glasgow Coma Scale total. A study aid for EMS students, not for patient care.
Open tool →Tick burned body regions for an adult or a child and get the estimated percent of total body surface area, as an NREMT study aid.
Open tool →Mean arterial pressure and pulse pressure from a blood pressure reading, with the 60 and 70 to 100 mm Hg benchmarks, as an NCLEX study aid.
Open tool →Pick the finding for each of the five Apgar signs and get the 0 to 10 total, with the repeat-at-10-minutes and escalation rules from the NCLEX course.
Open tool →Estimated date of delivery from the first day of the last menstrual period by Naegele's rule, with each step shown and optional gestational age.
Open tool →Add the six Braden subscale scores into the 6 to 23 total and see the pressure injury risk band: mild, moderate, high or severe.
Open tool →Heart rate from an EKG strip by the 1500, 300 and 6-second methods, with the R-R interval and when each method fits, as a CCMA study aid.
Open tool →Enter an adult systolic and diastolic reading and see the ACC/AHA category: normal, elevated, stage 1 or stage 2 hypertension, with the rule that decides it.
Open tool →Body mass index from kilograms and centimeters or pounds and inches, with the formula shown and the CDC adult categories.
Open tool →Put the PPE steps in the CDC donning order and the CDC doffing order, then check your sequence and see where it went wrong.
Open tool →Enter adult temperature, pulse, respirations, blood pressure and SpO2 and see each flagged against the typical ranges, with a reference table.
Open tool →Pick intradermal, subcutaneous or intramuscular and get the angle, typical gauge, needle length and common sites, with CDC length by age and weight.
Open tool →Calculate days supply for tablets, oral liquids, and insulin, rounded down to whole days - built for pharmacy technician exam prep.
Open tool →Mix a higher and a lower strength to make a desired strength and quantity - get the parts and the amount of each.
Open tool →Practice the standard phlebotomy order of draw: tap random sets of collection tubes into the correct sequence and see where you slipped.
Open tool →Look up a blood collection tube by color, additive or test, with its typical use and order-of-draw step.
Open tool →Get p, q, p^2, 2pq and q^2 from a recessive phenotype frequency, an allele frequency, or genotype counts, with a chi-square test.
Open tool →Enter two parent genotypes for one or two genes to get the Punnett square, gametes, and genotype and phenotype ratios with percentages.
Open tool →Free bacterial growth calculator: final population, number of generations or generation time from Nn = N0 x 2^n, with the working shown.
Open tool →Free serial dilution calculator: total dilution factor across steps and CFU/mL from a plate count, with the 30-300 colony countable-range check.
Open tool →Estimate resting energy with the Mifflin-St Jeor equation, then multiply by an activity factor for total daily energy expenditure, in metric or US units with the working shown.
Open tool →Convert grams of carbohydrate, protein, fat and alcohol to kilocalories, or a calorie target and percent split to grams, checked against AMDR ranges.
Open tool →Solve C1V1 = C2V2 for any one value in M or mM and L or mL, and see how much solvent to add to reach the final volume.
Open tool →First-order decay: find the amount remaining, the time elapsed or the half-life, plus the rate constant k, with the working shown.
Open tool →Find a buffer's pH from pKa (or Ka) and the base-to-acid ratio, or the ratio you need for a target pH, with a buffer-range check.
Open tool →Solve PV = nRT for pressure, volume, moles or temperature in atm, kPa, mmHg, L, mL, K or degrees C, with the steps shown.
Open tool →Molar mass of any formula, including parentheses and hydrates, with each element's count, mass contribution and mass percent.
Open tool →Convert between [H3O+], [OH-], pH and pOH, or find the pH of a strong acid, strong base or weak acid with the exact quadratic shown.
Open tool →Convert between metric and imperial units for length, mass, pressure/stress, torque, and volume flow rate - built for engineering coursework, not just everyday conversions.
Open tool →Enter two measurements with their uncertainties to see the propagated uncertainty in a sum, difference, product, or quotient.
Open tool →Enter any three of displacement, initial velocity, final velocity, acceleration and time to solve the other two, with the equation shown.
Open tool →Enter launch speed, angle and height to get time of flight, range, maximum height and impact velocity, with the working shown.
Open tool →Equivalent resistance for 2 to 8 resistors in series or parallel, plus current, voltage drop and power for each one.
Open tool →Solve 1/f = 1/do + 1/di for the focal length, object or image distance, with magnification and whether the image is real or virtual.
Open tool →Enter a discount rate and a series of cash flows to get both the net present value and the internal rate of return.
Open tool →Enter fixed costs, price per unit, and variable cost per unit to see exactly how many units - and how much revenue - it takes to break even.
Open tool →Midpoint price elasticity of demand from two prices and two quantities: elastic, inelastic or unitary, plus the total revenue effect.
Open tool →Inflation rate from CPI, nominal to real value, GDP deflator and real interest rate, with the formulas shown.
Open tool →Full depreciation schedule by straight-line, double-declining-balance or units-of-production, with book value never below salvage.
Open tool →Working capital, current and quick ratio, debt-to-equity, margins, and receivables and inventory turnover from statement figures.
Open tool →Get the mask, network and broadcast address, host range and usable host count for any IPv4 address and prefix - built for Security+ exam prep.
Open tool →Convert whole numbers between binary, octal, decimal and hexadecimal with the place-value working shown, plus 8, 16 and 32-bit two's complement.
Open tool →Calculate single loss expectancy, annualized loss expectancy and the net benefit of a security control from asset value, exposure factor and rate of occurrence.
Open tool →See whether a property policy met its coinsurance requirement and exactly what it pays on a loss - built for P&C license exam prep.
Open tool →Split a medical bill between you and the plan through the deductible, coinsurance, copay, and out-of-pocket maximum, step by step.
Open tool →Split a real estate commission between the listing and buyer brokerages, then between each broker and agent, with the math shown.
Open tool →Prorate annual property taxes at closing on a 360 or 365-day year, with the day count and the seller's share credited to the buyer.
Open tool →Current yield, an approximate yield to maturity and tax-equivalent yield with the formulas shown - built for Series 7 exam prep.
Open tool →Profit or loss, breakeven, maximum gain and maximum loss for a long or short call or put at expiration - built for FINRA SIE exam prep.
Open tool →Public offering price, shares bought, front-end load, your own breakpoint schedule and a back-end CDSC by year - built for FINRA SIE exam prep.
Open tool →Debit or credit balance, equity, maintenance call and the trigger price for a long or short margin position - built for FINRA SIE exam prep.
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