Free online calculators

8 tools

Single-purpose calculators for dates, percentages, ratios, grades, time zones and everyday arithmetic. The best ones show their formula so you can check the result; the listing links to the calculator itself, not to a page full of ads around it.

Showing 1–8 of 8

0.591score
LLM Pricing Calculator
Simon Willison
Enter input, cached and output token counts to see cost per model from a price table.
ArtifactNo sign-up★ 196calculators
0.588score
Compound Growth Calculator
grapes-labs
Shows how savings grow over time given a starting amount, regular deposits and an assumed yearly return, with yearly totals.
ArtifactNo sign-upcalculators
0.537score
Programmable Engineering Calculator
una
Calculator for engineering tasks that handles several variables and user-defined formulas, built by prompting an AI coding tool.
ArtifactNo sign-up★ 2calculators
0.528score
Floorplan Area Calculator
fredwongstudio
Upload a floor plan image, set its scale, then trace areas to get a digital takeoff of room sizes.
ArtifactNo sign-up★ 1calculators
0.477score
Date Calculator
Simon Willison
Finds the span between two dates in days, weeks, business days and weekend days, with a timeline.
ArtifactNo sign-upcalculators
0.477score
File Transfer Time
Simon Willison
Estimates how long a file takes to move, given its size and a connection speed in your units.
ArtifactNo sign-upcalculators
0.477score
Jina Image Token Calculator
Simon Willison
Estimates the token cost of an image for Jina embeddings by counting 224-pixel tiles.
ArtifactNo sign-upcalculators
0.477score
Percentage Recalculator
Simon Willison
Rescales up to four percentages so they total 100 after you tick off the ones to ignore.
ArtifactNo sign-upcalculators