Tools

Year-over-year growth calculator online free. Get the YoY percentage change, absolute change and growth multiplier between two periods, with steps shown, in your browser.

Present value of money calculator online free. Discount a future amount to today’s value with the discount factor shown as a step, plus the total discount, in your browser.

Population growth calculator online free. Project a population forward at a steady annual rate with a year-by-year table, total increase and growth factor, in your browser.

Cost index calculator online free. Adjust any amount between two dates using CPI values — index ratio, adjusted amount and percentage change shown step by step, in your browser.

Loan early repayment calculator online free. See how extra monthly payments or a lump sum cut your payoff time and total interest, compared month by month, in your browser.

Angle of complex number calculator online free. Find the argument in degrees and radians and the modulus of a + bi, with the quadrant steps shown, in your browser.

Cosh calculator online free. Calculate cosh(x) from the exponential definition, with sinh(x), tanh(x) and the identity check shown step by step, in your browser.

Euler phi function calculator online free. Compute Euler’s totient phi(n) from the prime factorisation, with the product formula shown step by step, in your browser.

Fibonacci series calculator online free. Generate the first N Fibonacci numbers with every addition step shown, or find a single term F(k) exactly, in your browser.

Linear equations in two variables calculator online free. Solve a pair a x + b y = c with determinants, all steps shown, plus honest no-solution and infinite-solution verdicts.

Mid point rule calculator online free. Approximate a definite integral numerically with the midpoint rule and see the full table of midpoints and values.

Polynomial root calculator online free. Find roots of polynomials up to degree 4: exact formulas for degrees 1 and 2, labelled numeric roots for 3 and 4.