Search
What do you need to get done?
Describe the calculation in plain language, or browse all 7 tools below.
- 7 live tools
- Free
- No signup
All tools
Browse the live calculators
Each tool shows its formula, units, assumptions and a worked example.
Belt Speed Calculator
Belt speed from drive-pulley diameter and motor RPM, with gearbox and optional belt-slip correction.
- No signup
- Formula shown
- updated 2026-09
Free
Pulley Speed Calculator
Driven-pulley RPM and belt linear speed from two pulley diameters and driver RPM.
- No signup
- Formula shown
- updated 2026-09
Free
Belt Length Calculator
Geometric belt length for a simple open two-pulley path.
- No signup
- Formula shown
- updated 2026-09
Free
Conveyor Belt Roll Length Calculator
Estimated belt inventory on a roll from outside diameter, core diameter and thickness.
- No signup
- Formula shown
- updated 2026-09
Free
Solar Savings Calculator
Illustrative solar operating savings and simple payback from your own annual kWh estimate.
- No signup
- Formula shown
- updated 2026-09
Free
SEO ROI Calculator
Forecast organic visits, conversions and attributed revenue from a keyword opportunity.
- No signup
- Formula shown
- updated 2026-09
Free
Content ROI Calculator
Attributed revenue per 1,000 organic sessions and a revenue-based content return proxy.
- No signup
- Formula shown
- updated 2026-09
Free
Start with the task
Tell us what you need to get done.
Describe the calculation you need and find the closest free tool. Product requests also help decide what Newlii builds next.
Free calculators need no signup · Methods and limits are shown