Units & Measurements

Convert between SI and CGS units — see factor-of-10 conversions for length, mass, force, energy, pressure.

Watch rounding in action — see how measurements round to the correct number of significant figures.

See how small rounding errors compound over repeated calculations.

Compare measured value with actual to compute absolute, relative, and percentage errors.

Visualize how absolute errors add when quantities are added or subtracted.

See how relative errors add when quantities are multiplied or divided.

Pick powers of M, L, T and see canonical physical quantities with matching dimensions.

Check whether a physical equation is dimensionally consistent across classical formulas.

Walk through 4 classic derivations — pendulum period, Bohr radius, projectile range, gravitational force.

Measure a length to 0.01 cm with a live vernier scale — MSR + VSD × LC.

Measure thicknesses to 0.001 cm with a circular thimble with 50 divisions.

Apply zero-error correction to raw instrument readings — both positive and negative zero error.