Vol. 12 · 121 tools, indexed · Updated daily
A complete
reference
for everyday
calculation,
from kilograms
to mortgages.
121 calculators and converters, arranged on a single page so you never click twice. Quiet typography, exact arithmetic, no advertising.
113
calculators
8
converters
0
categories
In rotation today — Mortgage payment, BMI, Celsius ↔ Fahrenheit, Tip & split, Date difference, Compound interest, kg ↔ lb.
Editor's picks · Spring 2026
№ 01 · ToolRight Circular Cylinder Volume CalculatorCalculate the volume of a right circular cylinder using radius and height. Get instant results with the formula V = πr²h.Open the tool№ 02 · ToolSphere Volume And Surface Area CalculatorCalculate sphere volume (V=4/3πr³) and surface area (A=4πr²) instantly. Enter radius to get precise measurements for any spherical object.Open the tool№ 03 · ToolTorus Surface Area CalculatorCalculate the surface area of a torus using major radius R and minor radius r with the formula A = 4π²Rr.Open the tool№ 04 · ToolTorus Volume CalculatorCalculate the volume of a torus (donut shape) using major radius and minor radius with the formula V = 2π²Rr².Open the tool
From the editors
What we mean
by “exact”.
Every conversion on terican uses constants ratified by the Bureau International des Poids et Mesures, computed in arbitrary precision and rounded only at the moment of display.
Calculators are open source, audited annually, and accompanied by their formulas in plain language — because a calculator that hides its arithmetic is just a magic trick.