Interpolation Calculator

Find intermediate values in seconds with Interpolation Calculator. Work with two reference points or a two-dimensional grid in a clear, modern interface built for everyday numerical tasks.

QUICK CALCULATIONS

• Linear interpolation between two known points

• Bilinear interpolation using four corner values

• Editable inputs and a familiar table layout for bilinear calculations

• A graph showing the reference points and target position

• Step-by-step solutions to help you follow the calculation

• Display precision of 2, 4 or 6 decimal places

• Saved calculation history and result sharing

• Decimal points, decimal commas and negative values

• Light and dark themes, with English and Russian interfaces

PRO WORKSPACE

A Pro subscription unlocks tools for working with larger tables:

• Import UTF-8 CSV and XLSX files or paste a table from Excel

• Select a worksheet and the X and F columns for linear tables

• Calculate values across piecewise linear tables and rectangular bilinear grids

• Process up to 1,000 target points in one calculation

• See a separate result or error for each point

• Enable extrapolation when you need values outside the table range

• Save local projects with tables, target points, units and notes

• Export Excel and PDF reports with source data and results

• Use the calculator without advertising

The main linear and bilinear calculators, graphs and ordinary calculation history remain available without a subscription. Previously purchased Pro access continues to apply.

CALCULATE WHERE YOU WORK

Calculations and locally saved projects work offline. An internet connection is needed for advertising, purchases and restoring purchases. Imported tables and projects are processed on your device; no account is required for calculations.

For XLSX imports, save formulas as values first. Tables support up to 10,000 source values, with files up to 10 MB. Units are labels and are not converted automatically. Calculations use full numerical precision; the selected decimal setting controls the displayed result.

A practical companion for students, engineers, technicians and anyone who works with numerical reference tables.