Free online calculators for everyday decisions

Turn everyday numbers into a clear answer. Each calculator explains its method, gives a worked example and states the limits you should check before relying on the result.

Choose a tool

Calculate dates and grades

Count elapsed days, weekdays and exact ages, or solve weighted grades and final-exam targets.

Plan everyday costs

Estimate a divided bill, trip fuel cost or fixed-rate monthly loan payment.

Convert values clearly

Solve percentage relationships and convert common length, mass and temperature units.

Choose the exact task

7 free calculators

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Date Difference Calculator: Days Between Dates

Calculate calendar days, weeks, weekdays and an exact age between two dates.

Open DateGap◇

Final Grade Calculator: What Grade Do I Need?

Calculate a weighted course grade and the score needed on your final exam.

Open GradePilot%

Percentage Calculator

Find a percentage of a number, percentage change, or the original value in seconds.

Open Percently⇄

Unit Converter: Length, Weight and Temperature

Convert common length, mass and temperature values with visible units.

Open UnitFlow◑

Bill Split Calculator With Tip & Tax

Split a restaurant bill, tip and tax fairly between any number of people.

Open SplitMate⌁

Fuel Cost Calculator for a Trip

Estimate fuel use, total trip cost and cost per passenger before you drive.

Open FuelTrip$

Loan Payment and Interest Calculator

Estimate monthly payments, total interest and payoff cost for a fixed-rate loan.

Open LoanMap

The ToolOrbit difference

Useful first. Private by default.

Use every current tool without creating an account. Tool contents are processed in your browser, and file tools do not upload selected files to ToolOrbit to complete the task.

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Common questions

Before you start

Do the calculators save my entries?

Calculator inputs normally remain in the current browser session and are not attached to a ToolOrbit account.

Can I use the results for official decisions?

Use them as transparent estimates and check the relevant contract, lender, syllabus, law or official source when the result matters.