All calculators

Published calculators currently available on Calcafy. Draft tools are excluded from this directory.

Percentages, changes, time/mass ratios, and OBP

Solve a/b = c/d with cross-multiplication

Reduced row echelon form with exact arithmetic

Volume in cubic yards for common shapes

Mulch volume and bag count estimator

Lumber board feet and cost estimator

Asphalt volume, weight, and tonnage

Dividend income, yield, and projection estimates

Average of multiple time durations

Monthly payment, amortization, and extra payment estimates

Savings and investment growth projections

Days between two dates

Exact fraction arithmetic with steps

Concrete volume and bag estimates

Gravel volume, weight, and tonnage

Area for common shapes

Pitch, slope, angle, and rafter length

Calendar age and age difference

Working days with holiday options

Add and subtract time durations

Simple interest and reverse solving