Sign in Start for free

Calculators with workings

Enter your own numbers and see the result and every step. Check your answers, then practise it yourself in the matching trainer.

AccountingTopics

Contribution margin calculatorEnter price, variable cost and quantity, optionally the fixed costs. You get unit contribution, total contribution, the contribution margin ratio and the operating result, each with the workings.Break-even calculatorEnter price, variable cost per unit and fixed costs. Optionally add planned sales (for the margin of safety) and a target profit. Every result comes with its workings.Cost-plus pricing calculatorEnter direct costs and overhead rates. You get material, conversion, production and total cost, optionally on to the list price with profit mark-up and discounts.

EconomicsTopics

Market equilibrium calculatorEnter demand Q_d = a − b·p and supply Q_s = c + d·p. You get the equilibrium price and quantity, consumer and producer surplus, the choke price and the price elasticities at equilibrium.Price elasticity calculatorEnter price and quantity before and after. You get the arc elasticity (midpoint method), the elasticity relative to the start, whether demand is elastic and the change in revenue.

CalculusTopics

Derivative calculatorEnter a function and differentiate it. You see which rule applies where (power, constant, sum, product, quotient and chain rule), optionally the second derivative and the slope at a point. Every result is checked numerically before it is shown.

Linear algebraTopics

Gaussian elimination calculatorEnter the coefficients and solve. You see every row operation and the matrix after it, exact with fractions. It also tells you when there is no solution or infinitely many. Or work out a determinant.

StatisticsTopics

Confidence interval calculatorFor a mean with known σ (z), with an estimated standard deviation s (t distribution) or for a proportion. The quantile is computed exactly, no table needed.Binomial distribution calculatorEnter n, p and k. You get the probability of exactly, at most, at least, fewer than and more than k successes, plus mean, variance and standard deviation.Mean, variance and median calculatorPaste your values, e.g. copied from a spreadsheet. You get mean, median, mode, range, variance and standard deviation, for a sample (n − 1) and for a population (n).