Online Calculators & Tools

Runs the three standard medication math checks: dose ordered over dose on hand times quantity, mg per kg by body weight, and IV drip rate.

Divide your monthly debt payments by gross income to get the back-end and front-end DTI ratios mortgage lenders check before approving a loan.

Builds a month-by-month payoff plan for up to four debts using the snowball or avalanche order, and shows how long it takes and what the interest costs.

Works out how many cubic yards of soil, gravel, mulch or concrete an area needs at a given depth, and what that volume weighs in tons.

Shows how long a card balance takes to clear on minimum payments alone, and what fixed payment you need to be debt free by a chosen month.

Finds the Pearson correlation coefficient for two lists of paired values, with r squared, the sample covariance and the least-squares regression line.

Check conduit fill against the NEC Chapter 9 limits, or find how many THHN conductors fit in EMT, rigid metal conduit or PVC Schedule 40.

Work out concrete for a floor across one or several rooms, with ready-mix truck loads, delivered cost and the bag count if you are mixing on site.

Add up buyer closing costs line by line, from origination and points to transfer tax and prepaid escrow, and see the cash you need at the table.

Work out the circumference of a circle from its radius or diameter, or go backwards from a known circumference to the radius, diameter and area.

Balances a chemical equation exactly by solving the atom conservation system, handling brackets and hydrates and refusing anything it cannot balance.

Works out the balance left on a car loan, the per diem interest, a payoff figure good for a set number of days, and whether you owe more than the car is worth.

Estimate a car lease payment from the MSRP, negotiated price, residual and money factor, with the depreciation and rent charge shown separately.

Work out the car price a monthly payment or a share of your income can carry, with APR, term, down payment, trade-in and sales tax.

Estimates what a walk burns from your weight and your speed, working either from the distance and the time or from a chosen pace, with calories per mile.

Estimates the calories an activity burns from your body weight, the minutes you spent on it and its MET value, with two dozen common activities built in.

Monthly repayment on a business loan, plus the effective rate once an origination fee is taken out, and the balloon due on a short-term commercial loan.

Works out the monthly payment, total interest and total cost of a boat loan, either from the amount financed or from the price, down payment and sales tax.

Estimates the tonnage of hot-mix asphalt a paving job needs from the area and the compacted thickness, with an optional waste allowance and cost per ton.

Finds the annual percentage rate implied by a loan amount, its up front fees and its payment schedule, solving for the rate by bisection.

Estimates an AP World History: Modern score from raw multiple choice, short answer, DBQ and long essay points using the published section weights.

Estimates an APUSH score from raw section marks using the published exam weightings and a fixed, stated set of cutoffs rather than a secret curve.

Estimates an AP English Language and Composition result from raw multiple choice and essay points, using the published 45 and 55 percent section weights.

Solves one equation in one variable when it reduces to linear or quadratic form, showing the standard form, the solution and a substitution check.

See how long a goal weight takes at a given daily calorie deficit, or get a daily calorie target from your age, size, sex and activity level.

Turn your guest count and reception length into bottles and cases of beer, wine and spirits, plus champagne for the toast.

Turn a tire size such as 225/45R17 into a real diameter, and compare two sizes to see the change in height, revolutions and speedometer reading.

Add up hours worked from clock-in and clock-out times or a week of daily hours, subtract unpaid breaks, and turn the result into regular and overtime pay.

Solve two equations in x and y, or three in x, y and z, by elimination. Enter each coefficient and get the solution and the determinant.

Find the monthly payment on a student loan over a fixed term, or work out how long a payment you choose takes to clear the balance and what the interest costs.

See what a starting balance and a monthly deposit grow to with monthly compounding, or find the deposit needed to hit a savings goal on time.

Convert pay between hourly, daily, weekly, bi-weekly, monthly and annual figures using your own hours per week and paid weeks per year.

Work out the monthly payment, total interest and total cost of a loan on an RV, camper or motorhome, from the amount financed or the sticker price.

Round a number to a set count of decimal places or to the nearest tenth, ten, hundred or thousand, with half up, down and up shown side by side.

Measure return on investment as a percentage, with net profit and an annualized rate that makes holdings of different lengths comparable.

Estimate your ascendant from your birth date and the time of day, using the two hour shortcut astrologers use when no birth chart is handy.

Project what your savings grow to by retirement from a yearly contribution and an expected return, and see the nest egg a target income needs.

Compare your current loan with a new rate and term to see the change in monthly payment, the break-even month on closing costs and the lifetime difference.

Solve any quadratic equation by entering a, b and c. Returns both roots, real or complex, with the discriminant, the vertex and the axis of symmetry.

Turn a pay rise into real numbers: new hourly, weekly or annual pay, the size of the increase, and the percentage it works out to.

Turn a distance and a finish time into pace per mile and per kilometer, or work the other way and get a finish time from a target running pace.

Estimate your 1RM for the bench press, squat or any lift from the weight and reps of a working set, using the Epley or Brzycki formula.

Estimate the zodiac sign the Moon was in when you were born from your birth date, time and time zone, using the Moon's mean longitude.

Split a daily calorie target into grams of protein, carbohydrate and fat, using either a preset for your goal or your own percentage split.

Count the combinations behind any lotto draw and get the exact odds of a jackpot, plus the chance of matching a smaller number of balls.

Divide two whole numbers and see every step: what the divisor goes into, what you subtract and the remainder carried to the next digit.

See how many months are left on a loan at your current payment, and how much time and interest an extra payment each month would save.

Reduce a birth date to its numerology life path number, keeping the master numbers 11, 22 and 33, and see the keyword traditionally tied to it.