Add Days to Date

Date addition/subtraction calculates the resulting date after adding or removing days, automatically handling month boundaries, varying month lengths, and leap years. Use this calculator for accurate, instant results.

The calculator uses the standard published formula for add days. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.