Thread: Cubby house stairs

Hello,
Ive built a big cubby house and need to put a few sets of stairs in. Ive googled everything in relation to measuring out stringers and staircases but it has just confused me. I have a height of 510mm and an overall run of 670mm. My tread will only be 200mm in depth (and although the standard minimum is 250mm I am using treated pine 200mm given it is for kids). Nothing I have googled has shown me how to calculate the measurements based on a specific overall run measurement. If someone can explain how I can measure this out based on my sizes it would be greatly appreciated...... or a website that can explain this accurately (and in mm not American inches!). I have calculated I will only have 2 treads (plus the top base) and therefore have a riser size of 170mm (x3 risers = 510mm), which fits in with the standard size, however I want to stretch this out over a run of 670mm on a 200mm stringer. I hope someone can understand where I'm going with this! I have a builders square ready to go if someone can just explain it in English. Thankyou