Free calculators

Calculators built for clear decisions.

Construction, measurement and finance calculations run locally with transparent formulas.

Construction and measurement

Field-ready calculators

Work with feet, inches, areas, roof pitch, stairs and unit conversions.

Add, subtract, multiply and divide field measurements.

Convert field measurements and decimal feet in either direction.

Calculate rectangular area from feet-and-inches dimensions.

Convert common metric and imperial lengths.

Convert rise, run, angle and slope into a complete roof-pitch result.

Turn total rise into a complete stair and stringer layout.

Personal finance

Estimate SIP growth and loan repayments.

Estimate systematic investment growth in Indian rupees.

Calculate loan EMI, interest cost and repayment schedule.