Maths Calculators

Start with triangle solving or volume calculators for common 3D shapes. Choose the tool that matches your problem, then follow the formula and steps on that page.

Maths tools and collections

Volume Calculators

Find volume for common 3D shapes with formulas, steps, and unit conversions.

Time to Decimal Calculator

Convert time to decimal hours or decimal hours back to HH:MM:SS. Covers payroll time cards, minutes to decimal table, Excel formulas, and bidirectional conversion.

Work Hours Calculator

Calculate hours worked from start and end times with break deductions. Covers daily and weekly totals, pay calculation, overnight shifts, 8-hour days, 40-hour weeks, and Excel formulas.

Triangle Calculator

Solve any triangle from sides and angles using SSS, SAS, ASA, AAS, or SSA. Find missing sides, angles, area, height, perimeter, and right triangle hypotenuse with step-by-step working.

Slope Calculator

Calculate slope from two points using rise over run. Get slope-intercept form, point-slope form, percent slope, angle in degrees, roof slope, ramp slope, and a live graph.

Distance Calculator

Calculate distance between two points in 2D, 3D, or lat/long mode. Also covers speed, distance, and time formula, flight distance, as the crow flies, and Google Maps distance.

GPA Calculator

Calculate GPA for college, high school, or middle school. Covers weighted, unweighted, cumulative, semester, science, and 4.0 scale GPA with credit-hour weighting and step-by-step working.

Percentage Calculator

Calculate percentages instantly: find X% of a number, what percentage one number is of another, percentage increase or decrease, percentage difference, and percentage off for discounts.

Aspect Ratio Calculator

Find the aspect ratio from any width and height, or scale dimensions proportionally. Covers 16:9, 4:3, 1:1, 3:2, and any custom ratio. Works with pixels, inches, or any unit.