---
title: "Free drone calculators: wind, return-to-home, golden hour, GSD"
description: "Free, no-sign-up calculators for drone pilots: check wind and gusts against your drone's limit, estimate the wind at 120 m, convert wind units, plan Return-to-Home, find the golden hour and the GSD of a mapping flight."
canonical: https://droneweatherforecast.app/tools
lang: en
site: Drone Weather Forecast
updated: 2026-11-14
alternates:
  - lang: pt-BR
    url: https://droneweatherforecast.app/pt/tools
  - lang: es
    url: https://droneweatherforecast.app/es/tools
html: https://droneweatherforecast.app/tools
markdown: https://droneweatherforecast.app/tools.md
llms_txt: https://droneweatherforecast.app/llms.txt
---

# Free calculators for drone pilots

> Free, no-sign-up calculators for drone pilots: check wind and gusts against your drone's limit, estimate the wind at 120 m, convert wind units, plan Return-to-Home, find the golden hour and the GSD of a mapping flight.

*Last updated: 2026-11-14*

Six small calculators for the questions pilots ask before take-off, from the wind check to planning a mapping flight. They run in your browser, need no account and send nothing anywhere. Each page explains the formula it uses, with a worked example, so you can check the numbers yourself.

## [Drone wind calculator](https://droneweatherforecast.app/tools/drone-wind-calculator)

Check the wind and gusts against your drone's maximum wind resistance. Pick your model from 77 drones or type its limit, and see OK, caution or no-go with the same rules as the app.

## [Wind at altitude calculator](https://droneweatherforecast.app/tools/wind-at-altitude-calculator)

Estimate the wind at 30, 50, 80, 100 and 120 m from the 10 m forecast, for open sea, open country, towns and calm nights, and compare it with your drone's wind limit.

## [Wind speed converter and Beaufort scale](https://droneweatherforecast.app/tools/wind-speed-converter)

Convert wind speed between km/h, m/s, mph and knots and see the Beaufort force, with a Beaufort table that says what each force means for a drone.

## [Return-to-home calculator with headwind](https://droneweatherforecast.app/tools/return-to-home-calculator)

Work out how long your drone takes to fly home against the wind, how much battery is left when it lands and the farthest point you can turn back from.

## [Golden hour and blue hour calculator](https://droneweatherforecast.app/tools/golden-hour-calculator)

Find the golden hour, blue hour, sunrise, sunset and solar noon for any place and date, to plan drone photos and videos in the best light.

## [GSD and overlap calculator for drone mapping](https://droneweatherforecast.app/tools/gsd-calculator)

Work out the ground sampling distance (cm per pixel), the photo footprint, the spacing between photos and flight lines and the shutter interval for a mapping flight.

The wind limits in the drone picker come from the same list the app uses; the full table is in the [drone wind limits chart](https://droneweatherforecast.app/drones).

## Get these checks for your flight, hour by hour

Drone Weather Forecast runs them for you: the hourly wind and gusts against your drone's limit, wind by altitude in Pro, KP index and GPS satellites. Free on Android and iOS, no ads.

- [Get it on Google Play](https://play.google.com/store/apps/details?id=xyz.droneweather.app)
- [Download on the App Store](https://apps.apple.com/app/drone-weather-forecast/id6768126094)