UltimaCalc is a scientific and mathematical graphing calculator. Always ready for use as it can stay on top of other windows, transparent when inactive. Type a calculation as plain text, evaluate it, maybe edit it and re-calculate, record all calculations. Has a comprehensive help system. Work with algebra. Simplify expressions, differentiate them. Integrate a wide range of expressions, and have the solution explained. Find Taylor series. Factorise polynomials, divide them, find their GCDs. Specialised tools run in their own windows, and can save their data for future reference. One tool performs a variety of least square fit methods (including non-linear, polynomial, multivariate). Another finds the minimum of a multi-variate expression. Others solve triangles, or find roots of polynomials up to tenth order, or solve simultaneous linear or non-linear equations. UltimaCalc includes logarithms to base 2, two-argument inverse tangent, greatest common divisor. Also floor and ceiling functions, absolute value, min, max, extract the fractional part of a number, find the value for which an expression is at its minimum. Find the slope of a line between two points. Calculate definite integrals. Define your own functions, variables and constants. UltimaCalc works to 38 digit precision. You can select the display precision and group the digits for readability. Two 'scientific' view modes use exponent format. The 'engineering' mode uses suffixes such as k (kilo) and M (mega). View results in hexadecimal and as ratios. Calculate the mean, median and standard deviation of a sample and its population. Use absolute deviation fit to minimise the distorting effects of outlying values. Plot functions: Specify starting and ending conditions and how the variables change. Combine multiple plots. Create charts. Add title, subtitle, labels. Adjust the layout, colours and hatching. Work with dates, future or past. Find Easter for any year. Simple navigational calculations.